Initial commit

.gitignore

@@ -0,0 +1,5 @@
+# Project exclude paths
+/.gradle/
+/.idea/
+**/build/
+!src/**/build/

LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
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+                        http://www.apache.org/licenses/
+
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+      by You to the Licensor shall be under the terms and conditions of
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+
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+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      on Your own behalf and on Your sole responsibility, not on behalf
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+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+   Copyright [2020] [Siniša Sovilj]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

README.md

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+# Kotlin System Dynamics Toolkit
+
+**Kotlin SD Toolkit** or *ksdtookit* is a tool suitable for both: 
+- modelling larger, hierarchical **system dynamics** (SD) models 
+(supporting modules) and 
+- for automatic generation of **interactive simulators** for multiple 
+target platforms: *desktop*, *web* or *mobile* using Kotlin programming language.
+
+## Intro
+
+*Kotlin* is a new (first appeared in 2011), statically-typed programming 
+language, with:
+- modern, more expressive syntax, 
+- null-pointer exception safety, 
+- both object-oriented and functional programming capabilities, 
+- interoperable with all existing Java libraries and frameworks, and 
+- since 2017 Google’s preferred language for Android application development;
+
+*Kotlin* also excels in developing internal, **domain-specific language** 
+(internal DSL), which allows adapting general-purpose language (e.g. *Kotlin*) to solve problems of 
+specific domain (e.g. system dynamics).
+
+*ksdtookit* consists of three modules:
+1. *ksdtoolkit-core* - core module for SD modelling & simulation, 
+  with exporters (CSV, PNG), and desktop simulator app,
+2. *ksdtoolkit-mobapp* - mobile simulator app module,
+3. *ksdtoolkit-webapp* - web simulator app module.
+
+
+## Usage
+
+#### Example:
+
+Modelling Innovation / Product diffusion SD model (also known as Bass diffusion model).
+
+![](images/Figure01.png?raw=true)
+
+#### 0. Setup
+```
+// Static properties (optional)
+companion object {
+    const val TOTAL_POPULATION_VALUE = 10000            // [customer]
+    const val ADVERTISING_EFFECTIVENESS_VALUE = 0.011   // [1/year]
+    const val CONTACT_RATE_VALUE = 100                  // [1/year]
+    const val ADOPTION_FRACTION_VALUE = 0.015           // []
+
+    const val INITIAL_TIME_VALUE = 0    // [year]
+    const val FINAL_TIME_VALUE = 10     // [year]
+    const val TIME_STEP_VALUE = 0.25    // [year]
+}
+```
+
+#### 1. Model
+```
+init {
+    val model = Model()
+
+    // Override default model properties
+    model.initialTime = INITIAL_TIME_VALUE
+    model.finalTime = FINAL_TIME_VALUE
+    model.timeStep = TIME_STEP_VALUE
+    model.integration = EulerIntegration()
+    model.name = "Innovation/Product Diffusion Model" // optional
+```
+
+#### 2. Entities
+##### Constants
+```
+    val TOTAL_POPULATION = model.constant("TOTAL_POPULATION")
+    val ADVERTISING_EFFECTIVENESS = model.constant("ADVERTISING_EFFECTIVENESS")
+    val CONTACT_RATE = model.constant("CONTACT_RATE")
+    val ADOPTION_FRACTION = model.constant("ADOPTION_FRACTION")
+```
+
+##### Converters
+```
+    val adoptionFromAdvertising =
+        model.converter("adoptionFromAdvertising")
+    val adoptionFromWordOfMouth =
+        model.converter("adoptionFromWordOfMouth")
+```
+##### Stocks
+```
+    val Potential_Adopters = model.stock("Potential_Adopters")
+    val Adopters = model.stock("Adopters")
+```
+##### Flows
+```
+    val adoptionRate = model.flow("adoptionRate")
+```
+##### Modules
+```
+```
+
+#### 3. Initial values
+##### Stocks
+```
+    Potential_Adopters.initialValue = { TOTAL_POPULATION }
+    Adopters.initialValue = { 0.0 }
+```
+
+#### 4. Equations
+##### Constants
+```
+    TOTAL_POPULATION.equation = { TOTAL_POPULATION_VALUE }
+    ADVERTISING_EFFECTIVENESS.equation = { ADVERTISING_EFFECTIVENESS_VALUE }
+    CONTACT_RATE.equation = { CONTACT_RATE_VALUE }
+    ADOPTION_FRACTION.equation = { ADOPTION_FRACTION_VALUE }
+```
+##### Converters
+```
+    adoptionFromAdvertising.equation = 
+        { Potential_Adopters * ADVERTISING_EFFECTIVENESS }
+    adoptionFromWordOfMouth.equation = 
+        { CONTACT_RATE * ADOPTION_FRACTION *
+        Potential_Adopters * Adopters / TOTAL_POPULATION }
+```
+##### Stocks
+```
+    Potential_Adopters.equation = { - adoptionRate }
+    Adopters.equation = { adoptionRate }
+```
+##### Flows
+```
+    adoptionRate.equation = 
+        { adoptionFromAdvertising + adoptionFromWordOfMouth }
+```
+##### Modules
+```
+```
+
+#### 5. Simulation
+```
+    val simulation = Simulation(model)
+```
+
+#### 6. Outputs
+```
+    simulation.outputs {
+        CsvExporter("output.csv", ";"))     // Text
+        PngExporter("chart.png"))           // Image
+        WinSimulator()                      // Desktop
+        WebSimulator()                      // Web
+        MobSimulator()                      // Mobile
+    }
+```
+
+#### 7. Run
+```
+    simulation.run()
+}
+```
+
+
+## Testing
+
+Whole *ksdtoolkit* project and all three project modules (*ksdtoolkit-core*, *ksdtoolkit-mobapp*, *ksdtoolkit-webapp*) 
+are designed as **Gradle** project/modules (using *Gradle Kotlin DSL*). Therefore, use **Gradlew Wrapper** 
+(*gradlew* in Windows or *./gradlew* in Linux/Mac) for 
+clean, build, test and run project/modules. 
+
+To run Gradle tasks, from IntelliJ one can use *Terminal window* (be in the root path where *gradlew* file is located). 
+(Instead of Terminal, an alternative is to install and use Gradle Plugin in IntelliJ.)
+
+To clean and build whole project (and all modules) use:
+ ```
+ gradlew clean build
+ ```
+(Close PngExporter and WinSimulator windows to allow build to finish).
+
+
+#### Desktop simulator
+To build only *ksdtoolkit-core* module use: 
+```
+gradlew :ksdtoolkit-core:build
+```
+Build will also run all unit tests located in *./ksdtoolkit-core/src/test/kotlin/hr.unipu.ksdtookit/*
+
+The last unit test `5_SimulationOutputsTest` contains output tests where e.g. *WinSimulator* is launched.
+
+![](images/Figure02.png?raw=true)
+
+
+#### Web simulator
+To build *ksdtoolkit-webapp* module and run web server use:
+```
+gradlew :ksdtoolkit-webapp:appStart
+```
+The web simulator will be accessible at: ```http://localhost:8080/```   
+
+![](images/Figure03.png?raw=true)
+(Valid developer licence numbers are needed for using *Vaadin Charts* and *Vaadin Spreadsheet*).
+
+
+#### Mobile simulator
+In IntelliJ first create and launch Android emulator (Tools | Android | AVD Manager). 
+To build *ksdtoolkit-mobapp* module and install *apk* file on Android emulator use:
+```
+gradlew :ksdtoolkit-mobapp:appStart
+```
+The mobile simulator will be automatically launched.
+
+![](images/Figure04.png?raw=true)
+
+
+## Authors
+
+ - **Siniša Sovilj**<sup>1</sup> <sinisa.sovilj@unipu.hr>
+ - **Darko Etinger**<sup>1</sup> <darko.etinger@unipu.hr>
+ - **Krešimir Pripužić**<sup>2</sup> <kresimir.pripuzic@fer.hr>
+ 
+<sup>1 = Juraj Dobrila University of Pula, Faculty of Informatics, HR-52100 Pula, CROATIA </sup>  \
+<sup>2 = University of Zagreb, Faculty of Electrical Engineering and Computing, HR-10000 Zagreb, CROATIA </sup> 
+
+
+## License
+This project is licensed under the Apache License 2.0 License. See the [LICENSE](LICENSE) file for details.
+
+
+## Acknowledgments
+Kotlin SD Toolkit was inspired by the great work of:
+* Drost & Stein - [System Dynamics Java-Framework](https://github.com/matthiasstein/SystemDynamics-Framework),
+* Schroeck - [Business Prototyping Toolkit for Python](https://github.com/transentis/bptk_py_tutorial).

build.gradle.kts

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+/**
+ * Root project.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+plugins {
+
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        mavenCentral()
+        maven(url="https://maven.google.com")
+        maven(url="https://jitpack.io")
+    }
+}
+
+group = "hr.unpu"
+version = "1.0-SNAPSHOT"

gradle.properties

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+kotlin.code.style=official
+systemProp.vaadin.charts.developer.license=c0171602-2326-457a-837d-226c949709f1
+systemProp.vaadin.spreadsheet.developer.license=8bf94b9d-b891-47b0-bad3-971445a274a5
+vaadin.charts.developer.license=c0171602-2326-457a-837d-226c949709f1
+vaadin.spreadsheet.developer.license=8bf94b9d-b891-47b0-bad3-971445a274a5

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

ksdtoolkit-core/build.gradle.kts

@@ -0,0 +1,46 @@
+/**
+ * Subproject: "ksdtoolkit-core".
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    id("org.jetbrains.kotlin.jvm")
+}
+
+tasks.withType<Jar> {
+    enabled = true
+}
+
+dependencies {
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+
+    testImplementation("org.jetbrains.kotlin:kotlin-test")
+
+    testImplementation("org.jetbrains.kotlin:kotlin-test-junit")
+
+    implementation("org.hamcrest:hamcrest-all:1.3")
+
+    implementation("ch.qos.logback:logback-classic:1.2.3")
+    implementation("ch.qos.logback:logback-core:1.2.3")
+
+    implementation("org.slf4j:slf4j-api:1.7.30")
+}
+
+val compileKotlin: KotlinCompile by tasks
+compileKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+
+val compileTestKotlin: KotlinCompile by tasks
+compileTestKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+
+repositories {
+    mavenCentral()
+}

ksdtoolkit-core/output_data.csv

@@ -0,0 +1,482 @@
+Module.inflow;outflow;Module.CONSTANT;Module.converter;Module.outflow;Module.INITIAL_STOCK;INITIAL_STOCK;converter;CONSTANT;inflow;Stock;Module.Stock
+0.833333;0.833333;10;0.008333;0.833333;100;100;0.008333;10;0.833333;100;100
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ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/Constant.kt

@@ -0,0 +1,11 @@
+package hr.unipu.ksdtoolkit.entities
+
+/**
+ * Constant entity.
+ *
+ * Constant class extends abstract class ModelEntity and only passes 'name' to the abstract class.
+ *
+ * @property name Constant name (only passed to the abstract class ModelEntity).
+ */
+
+class Constant(name: String) : ModelEntity(name)

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/Converter.kt

@@ -0,0 +1,82 @@
+package hr.unipu.ksdtoolkit.entities
+
+import java.util.*
+import kotlin.IllegalArgumentException
+
+/**
+ * Converter entity.
+ *
+ * Converter calculates a current value of a target [ModelEntity] in a time step, representing the cause-effect
+ * relationship between [ModelEntity] instances. Converters takes input data and converts it into some outputs
+ * signal. Converter calculations depends on the [equation] that has been delivered to the converter.
+ * Details:
+ * - Converters are used to disaggregate the complex functions that define flows into their constituent parts.
+ * - Converters may be influenced by stocks and can influence other converters.
+ * - In general, it converts [inputEntities] into an [targetEntity].
+ * - E.g. Unlike flows (which are special kinds of converters), they cannot directly influence a stock.
+ *
+ * @param targetEntity Target (outputs) model entity (calculated value).
+ * @param inputEntities Input model entities (that influence calculation).
+ *
+ */
+class Converter(name: String) : ModelEntity(name) {
+
+    private var inputEntities = arrayListOf<ModelEntity>()
+    lateinit var targetEntity: ModelEntity
+
+
+    constructor(targetEntity: ModelEntity,
+                vararg inputEntities: ModelEntity
+    ) : this(targetEntity.name) {
+
+        Collections.addAll(this.inputEntities, *inputEntities)
+        this.targetEntity = targetEntity
+
+    }
+
+
+    /**
+     * Convert the target model entity to a value.
+     */
+    fun convert() {
+        for (input in this.inputEntities) {
+            if (!input.isCurrentValueCalculated && input.converter != null) {
+                input.converter!!.convert()
+            }
+        }
+
+        targetEntity.currentValue = _equation?.invoke() ?: 0.0
+        targetEntity.isCurrentValueCalculated = true
+    }
+
+
+    /**
+     * Add multiple input model entities.
+     */
+    fun addInputs(vararg inputs: ModelEntity) {
+        for (input in inputs) {
+            this.addInput(input)
+        }
+    }
+
+
+    /**
+     * Add an input for the target entity.
+     */
+    private fun addInput(input: ModelEntity) {
+        if (!inputAlreadyAdded(input)) {
+            this.inputEntities.add(input)
+        } else {
+            throw IllegalArgumentException("Duplicate variable exception.")
+        }
+    }
+
+
+    /**
+     * Determine if a ModelEntity has been already added to the Converter.
+     */
+    private fun inputAlreadyAdded(input: ModelEntity): Boolean {
+        return inputEntities.contains(input)
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/Flow.kt

@@ -0,0 +1,13 @@
+package hr.unipu.ksdtoolkit.entities
+
+/**
+ * Flow entity.
+ *
+ * Flow can be an "input_flow" or "output_flow", which difference defines "change_rate" of a [Stock].
+ * Flows are special kind of converters. Flows can also be inputEntities to other converters.
+ *
+ * @property name Flow name (only passed to the abstract class ModelEntity).
+ */
+
+class Flow(name: String) : ModelEntity(name)
+

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/IFunction.kt

@@ -0,0 +1,11 @@
+package hr.unipu.ksdtoolkit.entities
+
+/**
+ * Function interface.
+ * (Not used anymore, just for legacy.)
+ */
+interface IFunction {
+    fun calculateEntityValue(): Double
+}
+
+

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/Model.kt

@@ -0,0 +1,222 @@
+package hr.unipu.ksdtoolkit.entities
+
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+import hr.unipu.ksdtoolkit.integration.Integration
+import java.text.DecimalFormat
+import kotlin.IllegalArgumentException
+import kotlin.reflect.full.createInstance
+
+/**
+ * Model class represents simulation model.
+ *
+ * Model defines all [ModelEntity] instances and their cause-effect relationships.
+ */
+
+open class Model(
+    /**
+     * Primary constructor.
+     */
+    var initialTime: Number = 0.0,
+    var finalTime: Number = 100.0,
+    var timeStep: Number = 0.25,
+    var integrationType: Integration = EulerIntegration(),
+    var name: String = "",
+    var timeUnit: String = "",
+
+    val entities: HashMap<String, ModelEntity> = hashMapOf(),
+    val converters: ArrayList<Converter> = arrayListOf(),
+    val modules: HashMap<String, Model> = hashMapOf(),
+
+    var currentTime: Double = initialTime.toDouble()
+
+) {
+
+    /**
+     * Getter: list of stocks.
+     */
+    val stocks: List<Stock>
+        get() {
+            val stocks = ArrayList<Stock>()
+            val modelEntities = ArrayList(this.entities.values)
+            modelEntities.forEach { modelEntity ->
+                if (modelEntity is Stock) {
+                    stocks.add(modelEntity)
+                }
+            }
+            return stocks
+        }
+
+
+    /**
+     * Getter: list of model entity keys.
+     */
+    val modelEntitiesKeys: List<String>
+        get() {
+            return ArrayList(this.entities.keys)
+        }
+
+
+    /**
+     * Getter: list of model entity units.
+     */
+    val modelEntitiesUnits: List<String>
+        get() {
+            val modelEntities = this.entities
+            val modelEntityUnits = ArrayList<String>()
+            modelEntities.forEach { modelEntity ->
+                modelEntityUnits.add(modelEntity.value.unit)
+            }
+            return modelEntityUnits
+        }
+
+
+    /**
+     * Getter: list of model entity values.
+     */
+    val modelEntitiesValues: List<String>
+        get() {
+            val modelEntityValues = ArrayList<String>()
+            val modelEntities = ArrayList(this.entities.values)
+            modelEntities.forEach { modelEntity ->
+                modelEntityValues.add(DecimalFormat("#.######").format(modelEntity.currentValue))
+            }
+            return modelEntityValues
+        }
+
+
+    /**
+     * Create a new model entity.
+     */
+    fun createModelEntity(entityType: ModelEntityType, name: String): ModelEntity? {
+        val modelEntity: ModelEntity
+        when (entityType) {
+            ModelEntityType.STOCK -> modelEntity = Stock(name)
+            ModelEntityType.FLOW -> modelEntity = Flow(name)
+            ModelEntityType.CONSTANT -> modelEntity = Constant(name)
+            ModelEntityType.CONVERTER -> modelEntity = Converter(name)
+        }
+        this.addModelEntity(modelEntity)
+        return modelEntity
+    }
+
+
+    /**
+     * Create a new entity - Stock.
+     */
+    fun stock(name: String): Stock {
+        val modelEntity: ModelEntity = Stock(name)
+        this.addModelEntity(modelEntity)
+        return modelEntity as Stock
+    }
+
+
+    /**
+     * Create a new entity - Flow.
+     */
+    fun flow(name: String): Flow {
+        val modelEntity: ModelEntity = Flow(name)
+        this.addModelEntity(modelEntity)
+        return modelEntity as Flow
+    }
+
+
+    /**
+     * Create a new entity - Constant.
+     */
+    fun constant(name: String): Constant {
+        val modelEntity: ModelEntity = Constant(name)
+        this.addModelEntity(modelEntity)
+        return modelEntity as Constant
+    }
+
+
+    /**
+     * Create a new entity - Converter.
+     */
+    fun converter(name: String): Converter {
+        val modelEntity: ModelEntity = Converter(name)
+        this.addModelEntity(modelEntity)
+        return modelEntity as Converter
+    }
+
+
+    /**
+     * Add model entity to the model.
+     */
+    fun addModelEntity(modelEntity: ModelEntity) {
+        if (!existModelEntity(modelEntity)) {
+            this.entities[modelEntity.name] = modelEntity
+        } else {
+            throw IllegalArgumentException("Duplicate model entity.")
+        }
+
+    }
+
+
+    /**
+     * Check whether model already contains a model entity or not.
+     */
+    private fun existModelEntity(modelEntity: ModelEntity): Boolean {
+        return this.entities.containsKey(modelEntity.name)
+    }
+
+
+    /**
+     * Create a new converter.
+     */
+    fun createConverter(entity: ModelEntity, vararg inputs: ModelEntity): Converter {
+        val converter = Converter(entity, *inputs)
+        this.addConverter(converter)
+        entity.converter = converter
+        return converter
+    }
+
+
+    /**
+     * Add converter to model.
+     */
+    private fun addConverter(converter: Converter) {
+        this.converters.add(converter)
+    }
+
+
+    /**
+     * Create a new module.
+     */
+    fun createModule(moduleName: String, modelPath: String): Model {
+        val moduleObject = Class.forName(modelPath).kotlin.createInstance()
+        val module = moduleObject as Model
+        module.name = moduleName
+        this.addModule(module)
+        return module
+    }
+
+
+    /**
+     * Add module to model.
+     */
+    private fun addModule(module: Model) {
+        if (!existModule(module)) {
+            this.modules[module.name] = module
+        } else {
+            throw IllegalArgumentException("Duplicate model module.")
+        }
+    }
+
+
+    /**
+     * Check whether model already contains a module or not.
+     */
+    private fun existModule(module: Model): Boolean {
+        return this.modules.containsKey(module.name)
+    }
+
+
+    /**
+     * Print model entities.
+     */
+    override fun toString(): String {
+        return "Model [entities = ${this.entities} ]"
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/ModelEntity.kt

@@ -0,0 +1,152 @@
+package hr.unipu.ksdtoolkit.entities
+
+/**
+ * Abstract class that represents SD entities: [Stock], [Flow] or [Constant].
+ *
+ * @property name Entity name.
+ * @property currentValue Entity current value (during integrationType). Default 0.0.
+ * @property previousValue Entity previous value (in previous step of integrationType). Default 0.0.
+ * @property equation Entity equation (for integrationType). Default null.
+ * @property isCurrentValueCalculated Flag: 'true' if the current value has already been calculated in integrationType
+ * process, and (default) 'false' otherwise.
+ * @property converter Entity converter (for converting one entity to another): default is 'null'.
+ */
+
+abstract class ModelEntity(
+    /**
+     * Primary constructor.
+     */
+    var name: String,
+    var description: String = "",
+    var unit: String = "",
+    var currentValue: Double = 0.0,
+    var previousValue: Double = 0.0,
+    var isCurrentValueCalculated: Boolean = false,
+    var converter: Converter? = null
+
+) {
+
+    val _equation: (()->Double?)?
+        get() {
+            val invocationResult = equation?.invoke()
+            return when(invocationResult) {
+                is Double -> {
+                    this.isCurrentValueCalculated = true
+
+                    { invocationResult as Double? }
+                }
+                is ModelEntity -> {
+
+                    if (invocationResult.isCurrentValueCalculated == false) {
+                        this.isCurrentValueCalculated = false
+                    } else {
+                        this.isCurrentValueCalculated = true
+                    }
+                    { (invocationResult as ModelEntity).currentValue }
+                }
+                is Int -> {
+                    this.isCurrentValueCalculated = true
+                    { invocationResult.toDouble() }
+                }
+                else -> {
+                    { null }
+                }
+            }
+        }
+    var equation: (()->Any?)? = null
+
+
+    /**
+     * Overridden methods.
+     */
+    override fun toString(): String {
+        return "ModelEntity[ name=${this.name}, value=${this.currentValue}, previousValue=${this.previousValue} ]"
+    }
+
+
+    /**
+     * Operator overloading: times.
+     */
+    operator fun times(other: Any): Double {
+        return when (other) {
+            is ModelEntity -> this.currentValue * other.currentValue
+            is Double -> this.currentValue * other
+            is Int -> this.currentValue * (other.toDouble())
+            else -> 0.0
+        }
+    }
+
+
+    /**
+     * Operator overloading: plus.
+     */
+    operator fun plus(other: Any): Double {
+        return when(other) {
+            is ModelEntity -> this.currentValue + other.currentValue
+            is Double -> this.currentValue + other
+            is Int -> this.currentValue + (other.toDouble())
+            else -> 0.0
+        }
+    }
+
+
+    /**
+     * Operator overloading: minus.
+     */
+    operator fun minus(other: Any): Double {
+        return when(other) {
+            is ModelEntity -> this.currentValue - other.currentValue
+            is Double -> this.currentValue - other
+            is Int -> this.currentValue - (other.toDouble())
+            else -> 0.0
+        }
+    }
+
+
+    /**
+     * Operator overloading: div.
+     */
+    operator fun div(other: Any): Double {
+        return when(other) {
+            is ModelEntity -> if (other != 0) this.currentValue / other.currentValue else 0.0
+            is Double -> if (other != 0) this.currentValue / other else 0.0
+            is Int -> this.currentValue / (other.toDouble())
+            else -> 0.0
+        }
+    }
+
+
+    /**
+     * Operator overloading: unaryMinus.
+     */
+    operator fun unaryMinus(): Double {
+        return this.currentValue * (-1.0)
+    }
+
+}
+
+
+/**
+ * For commutativity - extension function on Double: div.
+ */
+operator fun Double.div(other: Any): Double {
+    return when (other) {
+        is ModelEntity -> if (other != 0) this / other.currentValue else 0.0
+        is Double -> if (other != 0) this / other else 0.0
+        is Int -> this / (other.toDouble())
+        else -> 0.0
+    }
+}
+
+
+/**
+ * For commutativity - extension function on Double: times.
+ */
+operator fun Double.times(other: Any): Double {
+    return when (other) {
+        is ModelEntity -> this * other.currentValue
+        is Double -> this * other
+        is Int -> this * (other.toDouble())
+        else -> 0.0
+    }
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/ModelEntityType.kt

@@ -0,0 +1,10 @@
+package hr.unipu.ksdtoolkit.entities
+
+/**
+ * Three entities of system dynamics models: [Stock], [Flow] and [Constant].
+ * [Flow] and [Converter] are basically the same entity, but with different roles.
+ *
+ */
+enum class ModelEntityType {
+    STOCK, FLOW, CONSTANT, CONVERTER
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/entities/Stock.kt

@@ -0,0 +1,37 @@
+package hr.unipu.ksdtoolkit.entities
+
+/**
+ * Stock entity.
+ *
+ * Stock has one or more "input" and "outputs" [Flow] instances, integrates (accumulates) their difference or "change
+ * rate", and represents a "memory"  of a current state of the dynamics system.
+ * Stocks can be only influenced by flows.
+ *
+ * @property name Stock name (only passed to the abstract class ModelEntity).
+ */
+class Stock(name: String) : ModelEntity(name) {
+
+    val _initialValue: (()->Double?)?
+        get() {
+            val invocationResult = initialValue?.invoke()
+            return when(invocationResult) {
+                is Double -> {
+                    { invocationResult as Double? }
+                }
+                is ModelEntity -> {
+                    { invocationResult.equation?.invoke().toString().toDouble() }
+                }
+                is Int -> {
+                    { invocationResult.toDouble() }
+                }
+                else -> null
+            }
+        }
+    var initialValue: (()->Any?)? = null
+
+
+    init {
+        this.isCurrentValueCalculated = true
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/integration/EulerIntegration.kt

@@ -0,0 +1,18 @@
+package hr.unipu.ksdtoolkit.integration
+
+/**
+ * Euler method for numeric integrationType implementation.
+ *
+ * The class is extends [Integration] abstract class.
+ */
+class EulerIntegration : Integration() {
+
+    override fun integrate() {
+        for(stock in stocks) {
+            val calculatedValue = stock.currentValue + ( stock._equation?.invoke() ?: 0.0 ) * dt
+            stock.currentValue = calculatedValue
+            stock.isCurrentValueCalculated = true
+        }
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/integration/Integration.kt

@@ -0,0 +1,18 @@
+package hr.unipu.ksdtoolkit.integration
+
+import hr.unipu.ksdtoolkit.entities.Stock
+
+/**
+ * Abstract class that describes an integrationType process.
+ */
+abstract class Integration {
+
+    var dt: Double = 0.0
+    var stocks: List<Stock> = arrayListOf()
+    var converters: List<hr.unipu.ksdtoolkit.entities.Converter> = arrayListOf()
+
+    /**
+     * Abstract method for numeric integrationType that has to be implemented (by methods: Euler, Runge-Kutta, etc.)
+     */
+    abstract fun integrate()
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/integration/RungeKuttaIntegration.kt

@@ -0,0 +1,30 @@
+package hr.unipu.ksdtoolkit.integration
+
+/**
+ * Runge-Kutta method for numeric integrationType implementation.
+ *
+ * The class is extends [Integration] abstract class.
+ */
+class RungeKuttaIntegration : Integration() {
+
+    override fun integrate() {
+        val k = Array(this.stocks.size) { DoubleArray(4) }
+        for (i in 0..3) {
+            var j = 0
+            for (stock in this.stocks) {
+                k[j][i] = (stock._equation?.invoke() ?: 0.0) * this.dt
+                if (i < 2)
+                    stock.currentValue = stock.previousValue + k[j][i] / 2
+                else if (i == 2)
+                    stock.currentValue = stock.previousValue + k[j][i]
+                else {
+                    val calculatedValue = stock.previousValue + k[j][0] / 6 + k[j][1] / 3 + k[j][2] / 3 + k[j][3] / 6
+                    stock.currentValue = calculatedValue
+                }
+                stock.isCurrentValueCalculated = true
+                j++
+            }
+        }
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/models/ModelBassDiffusion.kt

@@ -0,0 +1,131 @@
+package hr.unipu.ksdtoolkit.models
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+
+/**
+ * SD model of Bass Diffusion.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+open class ModelBassDiffusion : Model() {
+
+    // Static properties:
+    companion object {
+        const val INITIAL_TARGET_MARKET_SIZE_KEY = "INITIAL_TARGET_MARKET_SIZE"
+        const val INITIAL_CUSTOMER_BASE_SIZE_KEY = "INITIAL_CUSTOMER_BASE_SIZE"
+        const val ADVERTISING_BUDGET_KEY = "ADVERTISING_BUDGET"
+        const val PERSONS_REACHED_PER_EURO_KEY = "PERSONS_REACHED_PER_EURO"
+        const val ADVERTISING_SUCCESS_RATE_KEY = "ADVERTISING_SUCCESS_RATE"
+        const val WORD_OF_MOUTH_CONTACT_RATE_KEY = "WORD_OF_MOUTH_CONTACT_RATE"
+        const val WORD_OF_MOUTH_SUCCESS_RATE_KEY = "WORD_OF_MOUTH_SUCCESS_RATE"
+
+        const val INITIAL_TARGET_MARKET_SIZE_VALUE= 6e6     // [customer]
+        const val INITIAL_CUSTOMER_BASE_SIZE_VALUE = 0.0    // [customer]
+        const val ADVERTISING_BUDGET_VALUE = 10000.0        // [EUR/month]
+        const val PERSONS_REACHED_PER_EURO_VALUE = 100.0    // [customer/EUR]
+        const val ADVERTISING_SUCCESS_RATE_VALUE = 1.0      // [%]
+        const val WORD_OF_MOUTH_CONTACT_RATE_VALUE = 1      // [1/month]
+        const val WORD_OF_MOUTH_SUCCESS_RATE_VALUE = 10.0   // [%]
+
+        const val INITIAL_TIME_VALUE = 0.0
+        const val FINAL_TIME_VALUE = 60.0
+        const val TIME_STEP_VALUE = 0.25
+    }
+
+
+    init {
+
+        // 1. Create the model (with setup of: time boundaries & time step & integrationType type)
+        val model = this    // inheritance: Model()
+                            // alternative: Model(INITIAL_TIME_VALUE, FINAL_TIME_VALUE, TIME_STEP_VALUE, EulerIntegration())
+
+        // override default model properties:
+        model.initialTime = INITIAL_TIME_VALUE
+        model.finalTime = FINAL_TIME_VALUE
+        model.timeStep = TIME_STEP_VALUE
+        model.integrationType = EulerIntegration()
+        model.name = "Bass Diffusion Model"   // name is optional
+
+
+
+        // 2. Create all system elements:
+
+        // - 2a. Variables
+        val INITIAL_TARGET_MARKET_SIZE= model.constant(INITIAL_TARGET_MARKET_SIZE_KEY)
+        val INITIAL_CUSTOMER_BASE_SIZE = model.constant(INITIAL_CUSTOMER_BASE_SIZE_KEY)
+        val ADVERTISING_BUDGET = model.constant(ADVERTISING_BUDGET_KEY)
+        val PERSONS_REACHED_PER_EURO = model.constant(PERSONS_REACHED_PER_EURO_KEY)
+        val ADVERTISING_SUCCESS_RATE = model.constant(ADVERTISING_SUCCESS_RATE_KEY)
+        val WORD_OF_MOUTH_CONTACT_RATE = model.constant(WORD_OF_MOUTH_CONTACT_RATE_KEY)
+        val WORD_OF_MOUTH_SUCCESS_RATE = model.constant(WORD_OF_MOUTH_SUCCESS_RATE_KEY)
+
+        val marketSaturationPct = model.converter("marketSaturationPct")
+        val potentialCustomersReachedThroughAdvertising = model.converter("potentialCustomersReachedThroughAdvertising")
+        val acquisitionThroughAdvertising = model.converter("acquisitionThroughAdvertising")
+        val potentialCustomersReachedThroughWordOfMouth = model.converter("potentialCustomersReachedThroughWordOfMouth")
+        val acquisitionThroughWordOfMouth = model.converter("acquisitionThroughWordOfMouth")
+
+        // - 2b. Stocks
+        val Customer_Base = model.stock("Customer_Base")
+        val Advertising_Customers = model.stock("Advertising_Customers")
+        val WordOfMouth_Customers = model.stock("WordOfMouth_Customers")
+
+        // - 2c. Flows
+        val customerAcquisition = model.flow("customerAcquisition")
+        val advCustomerIn = model.flow("advCustomerIn")
+        val womCustomerIn = model.flow("womCustomerIn")
+
+
+
+        // 3. Initial values:
+
+        // - 3a. Stocks
+
+        Customer_Base.initialValue = { INITIAL_CUSTOMER_BASE_SIZE }
+        Advertising_Customers.initialValue = { 0.0 }
+        WordOfMouth_Customers.initialValue = { 0.0 }
+
+
+
+        // 4. Equations:
+
+        // - 4a. Variables
+        INITIAL_TARGET_MARKET_SIZE.equation = { INITIAL_TARGET_MARKET_SIZE_VALUE }
+        INITIAL_CUSTOMER_BASE_SIZE.equation = { INITIAL_CUSTOMER_BASE_SIZE_VALUE }
+        ADVERTISING_BUDGET.equation = { ADVERTISING_BUDGET_VALUE }
+        PERSONS_REACHED_PER_EURO.equation = { PERSONS_REACHED_PER_EURO_VALUE }
+        ADVERTISING_SUCCESS_RATE.equation = { ADVERTISING_SUCCESS_RATE_VALUE }
+        WORD_OF_MOUTH_CONTACT_RATE.equation = { WORD_OF_MOUTH_CONTACT_RATE_VALUE }
+        WORD_OF_MOUTH_SUCCESS_RATE.equation = { WORD_OF_MOUTH_SUCCESS_RATE_VALUE }
+
+        // - 4b. Stocks
+
+        Customer_Base.equation = { customerAcquisition }
+        Advertising_Customers.equation = { advCustomerIn }
+        WordOfMouth_Customers.equation = { womCustomerIn }
+
+        // - 4c. Flows
+        customerAcquisition.equation = { advCustomerIn + womCustomerIn }
+        advCustomerIn.equation = { acquisitionThroughAdvertising }
+        womCustomerIn.equation = { acquisitionThroughWordOfMouth }
+
+        // - 4d. Converters:
+
+        marketSaturationPct.equation = { Customer_Base / INITIAL_TARGET_MARKET_SIZE * 100.0 }
+
+        potentialCustomersReachedThroughAdvertising.equation =
+            { PERSONS_REACHED_PER_EURO * ADVERTISING_BUDGET * (1.0 - marketSaturationPct / 100.0) }
+
+        acquisitionThroughAdvertising.equation =
+            { potentialCustomersReachedThroughAdvertising * ADVERTISING_SUCCESS_RATE / 100.0 }
+
+        potentialCustomersReachedThroughWordOfMouth.equation =
+            { WORD_OF_MOUTH_CONTACT_RATE * Customer_Base * (1 - marketSaturationPct / 100.0) }
+
+        acquisitionThroughWordOfMouth.equation =
+            { potentialCustomersReachedThroughWordOfMouth * WORD_OF_MOUTH_SUCCESS_RATE / 100.0 }
+
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/models/ModelGenericSD.kt

@@ -0,0 +1,131 @@
+package hr.unipu.ksdtoolkit.models
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+import hr.unipu.ksdtoolkit.modules.ModuleGenericCompoundDecrease
+
+/**
+ * SD model of Simple Compound Interest.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+open class ModelGenericSD : Model() {
+
+    // Static properties:
+    companion object {
+        const val CONSTANT_KEY = "CONSTANT"
+        const val CONVERTER_KEY = "converter"
+        const val INITIAL_STOCK_KEY = "INITIAL_STOCK"
+        const val INFLOW_KEY = "inflow"
+        const val OUTFLOW_KEY = "outflow"
+        const val STOCK_KEY = "Stock"
+
+        const val CONSTANT_VALUE = 10          // [%]
+        const val INITIAL_STOCK_VALUE = 100    // [€]
+        const val INITIAL_TIME_VALUE = 0       // [month]
+        const val FINAL_TIME_VALUE = 120       // [month]
+        const val TIME_STEP_VALUE = 0.25       // [month]
+    }
+
+
+    init {
+
+        // 1. Create the model (with setup of: time boundaries & time step & integrationType type)
+        val model = this   // inheritance: Model()
+
+        /*
+        val model = Model(
+            initialTime = 0,
+            finalTime = 100,
+            timeStep = 0.25,
+            integrationType = EulerIntegration()
+        )
+        */
+
+
+        /*
+        val model = Model(0, 100, 0.25, EulerIntegration())
+            // alternative: Model(INITIAL_TIME_VALUE, FINAL_TIME_VALUE, TIME_STEP_VALUE, EulerIntegration())
+        */
+
+
+        // override default model properties:
+        model.initialTime = INITIAL_TIME_VALUE
+        model.finalTime = FINAL_TIME_VALUE
+        model.timeStep = TIME_STEP_VALUE
+        model.integrationType = EulerIntegration()
+        model.name = "Generic SD Model"   // name is optional
+        model.timeUnit = "month"          // unit is optional
+
+
+
+        // 2. Create all system elements:
+
+        // - 2a. Variables (Constants)
+        val CONSTANT = model.constant(CONSTANT_KEY)
+        val INITIAL_STOCK = model.constant(INITIAL_STOCK_KEY)
+
+        // - 2b. Variables (Converters)
+        val converter = model.converter(CONVERTER_KEY)
+
+        // - 2c. Stocks
+        val Stock = model.stock(STOCK_KEY)
+
+        // - 2d. Flows
+        val inflow = model.flow(INFLOW_KEY)
+        val outflow = model.flow(OUTFLOW_KEY)
+
+        // - 2e. Modules
+        val Module = model.createModule(
+            "Module",
+            "hr.unipu.ksdtoolkit.modules.ModuleGenericCompoundDecrease"
+        ) as ModuleGenericCompoundDecrease
+
+
+        // - 2f. (Optional): Entities' descriptions
+        CONSTANT.description = "Annual flow rate in [%/year]"
+        INITIAL_STOCK.description = "Initial capital in [EUR] in the beginning of the simulation."
+        converter.description = "Converts percentage to decimal."
+        Stock.description = "Accumulated capital in [EUR] at specific point in time."
+        inflow.description = "Interest inflow in [EUR / chosen unit of time], e.g. [EUR/month]."
+        outflow.description = "Interest outflow in [EUR / chosen unit of time], e.g. [EUR/month]."
+
+        // - 2g. (Optional): Entities' units
+        CONSTANT.unit = "%/year"
+        INITIAL_STOCK.unit = "€"
+        Stock.unit = "€"
+        inflow.unit = "€/month"
+        outflow.unit = "€/month"
+
+
+        // 3. Initial values:
+
+        // - 3a. Stocks
+        Stock.initialValue = { INITIAL_STOCK }      // Accepts: Double, Int or ModelEntity
+
+
+
+        // 4. Equations:
+
+        // - 4a. Constants
+        CONSTANT.equation = { CONSTANT_VALUE }
+        INITIAL_STOCK.equation = { INITIAL_STOCK_VALUE }
+
+        // - 4b. Converters
+        converter.equation = { CONSTANT / 100.0 / 12.0 }
+
+        // - 4c. Stocks
+        Stock.equation = { inflow - outflow }     // Function type can be either Double or ModelEntity.
+
+        // - 4d. Flows:
+        inflow.equation = { Stock * converter }    // Simplified converters so that only equations are used.
+        outflow.equation = { Module.outflow }      // Alternative, instead of lambda, member reference: Module::outflow
+
+        // - 4e. Modules:
+        Module.inflow.equation = { outflow }
+
+
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/models/ModelInheritedCompoundInterest.kt

@@ -0,0 +1,71 @@
+package hr.unipu.ksdtoolkit.models
+
+import hr.unipu.ksdtoolkit.integration.RungeKuttaIntegration
+
+/**
+ * Inheritance of Simple Compound Interest Model.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+class ModelInheritedCompoundInterest : ModelSimpleCompoundInterest() {
+
+    // Static properties:
+    companion object {
+        const val INTEREST_RATE_KEY = "INTEREST_RATE"
+        const val INITIAL_CAPITAL_KEY = "INITIAL_CAPITAL"
+        const val INTEREST_KEY = "interest"
+        const val CAPITAL_KEY = "Capital"
+
+        const val INTEREST_RATE_VALUE = -0.1 / 12
+        const val INITIAL_CAPITAL_VALUE = 200.0
+        const val INITIAL_TIME_VALUE = 0.0
+        const val FINAL_TIME_VALUE = 240.0
+        const val TIME_STEP_VALUE = 0.25
+    }
+
+
+    // 1. Create the model (with the parameters)
+    val modelInherited = this    // inheritance: ModelSimpleCompoundInterest()
+    //val modelInherited = object : ModelSimpleCompoundInterest() {}
+
+
+    init {
+
+        // overriding default model properties:
+        modelInherited.initialTime = INITIAL_TIME_VALUE
+        modelInherited.finalTime = FINAL_TIME_VALUE
+        modelInherited.timeStep = TIME_STEP_VALUE
+        modelInherited.integrationType = RungeKuttaIntegration()
+        modelInherited.name = "Inherited Compound Interest Model"
+
+        // changing inherited model constants
+        modelInherited.entities[INITIAL_CAPITAL_KEY]?.equation = { INITIAL_CAPITAL_VALUE }
+        modelInherited.entities[INTEREST_RATE_KEY]?.equation = { INTEREST_RATE_VALUE }
+
+        modelInherited.INITIAL_CAPITAL.equation = { 200.0 }
+        modelInherited.INTEREST_RATE.equation = { -0.1 / 12 }
+    }
+
+    val ModuleSimpleCompound1 = modelInherited.createModule(
+        "ModuleSimpleCompound1",
+        "hr.unipu.ksdtoolkit.models.ModelSimpleCompoundInterest"
+    ) as ModelSimpleCompoundInterest
+
+    val ModuleSimpleCompound2 = object : ModelSimpleCompoundInterest() {}
+
+    init {
+        modelInherited.modules["ModuleSimpleCompound1"]?.entities!!["INITIAl_CAPITAL"]?.equation = { 1000.0 }
+
+        modelInherited.ModuleSimpleCompound1.INITIAL_CAPITAL.equation = { 1000.0 }
+
+        modelInherited.ModuleSimpleCompound2.INITIAL_CAPITAL.equation = { 1000.0 }
+    }
+
+    val some_converter_in_parent = modelInherited.converter("some_converter_in_parent")
+
+    init {
+        some_converter_in_parent.equation = { modelInherited.ModuleSimpleCompound1.INITIAL_CAPITAL }
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/models/ModelInnovationDiffusion.kt

@@ -0,0 +1,113 @@
+package hr.unipu.ksdtoolkit.models
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+import hr.unipu.ksdtoolkit.entities.div
+import hr.unipu.ksdtoolkit.entities.times
+import hr.unipu.ksdtoolkit.integration.RungeKuttaIntegration
+
+/**
+ * SD model of Bass Diffusion.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+open class ModelInnovationDiffusion : Model() {
+
+    // Static properties:
+    companion object {
+        const val TOTAL_POPULATION_KEY = "TOTAL_POPULATION"
+        const val ADVERTISING_EFFECTIVENESS_KEY = "ADVERTISING_EFFECTIVENESS"
+        const val CONTACT_RATE_KEY = "CONTACT_RATE"
+        const val ADOPTION_FRACTION_KEY = "ADOPTION_FRACTION"
+
+        const val TOTAL_POPULATION_VALUE = 10000.0          // [customer]
+        const val ADVERTISING_EFFECTIVENESS_VALUE = 0.011   // [1/year]
+        const val CONTACT_RATE_VALUE = 100.0                // [1/year]
+        const val ADOPTION_FRACTION_VALUE = 0.015           // [ ]
+
+        const val INITIAL_TIME_VALUE = 0.0
+        const val FINAL_TIME_VALUE = 10.0
+        const val TIME_STEP_VALUE = 0.25
+    }
+
+
+    init {
+
+        // 1. Create the model (with setup of: time boundaries & time step & integrationType type)
+        val model = this    // inheritance: Model()
+                            // alternative: Model(INITIAL_TIME_VALUE, FINAL_TIME_VALUE, TIME_STEP_VALUE, EulerIntegration())
+
+        // override default model properties:
+        model.initialTime = INITIAL_TIME_VALUE
+        model.finalTime = FINAL_TIME_VALUE
+        model.timeStep = TIME_STEP_VALUE
+        model.timeUnit = "year"        // optional
+
+        //model.integrationType = EulerIntegration()
+        model.integrationType = RungeKuttaIntegration()
+        model.name = "Innovation/Product Diffusion Model"
+
+
+
+        // 2. Create all system elements:
+
+        // - 2a. Variables (Constants)
+        val TOTAL_POPULATION = model.constant("TOTAL_POPULATION")
+        val ADVERTISING_EFFECTIVENESS = model.constant("ADVERTISING_EFFECTIVENESS")
+        val CONTACT_RATE = model.constant("CONTACT_RATE")
+        val ADOPTION_FRACTION = model.constant("ADOPTION_FRACTION")
+
+        // - 2b. Variables (Converters)
+        val adoptionFromAdvertising = model.converter("adoptionFromAdvertising")
+        val adoptionFromWordOfMouth = model.converter("adoptionFromWordOfMouth")
+
+        // - 2c. Stocks
+        val Potential_Adopters = model.stock("Potential_Adopters")
+        val Adopters = model.stock("Adopters")
+
+        // - 2d. Flows
+        val adoptionRate = model.flow("adoptionRate")
+
+        // - 2g. (Optional): Entities' units
+        TOTAL_POPULATION.unit = "customer"
+        ADVERTISING_EFFECTIVENESS.unit = "1/year"
+        CONTACT_RATE.unit = "1/year"
+        ADOPTION_FRACTION.unit = ""
+        Potential_Adopters.unit = "customer"
+        Adopters.unit = "customer"
+        adoptionRate.unit = "customer/year"
+
+
+
+        // 3. Initial values:
+
+        // - 3a. Stocks
+        Potential_Adopters.initialValue = { TOTAL_POPULATION }
+        Adopters.initialValue = { 0.0 }
+
+
+
+        // 4. Equations:
+
+        // - 4a. Constants:
+        TOTAL_POPULATION.equation = { TOTAL_POPULATION_VALUE }
+        ADVERTISING_EFFECTIVENESS.equation = { ADVERTISING_EFFECTIVENESS_VALUE }
+        CONTACT_RATE.equation = { CONTACT_RATE_VALUE }
+        ADOPTION_FRACTION.equation = { ADOPTION_FRACTION_VALUE }
+
+        // - 4b. Converters:
+        adoptionFromAdvertising.equation = { Potential_Adopters * ADVERTISING_EFFECTIVENESS }
+        adoptionFromWordOfMouth.equation = { CONTACT_RATE * ADOPTION_FRACTION *
+                Potential_Adopters * Adopters / TOTAL_POPULATION }
+
+        // - 4c. Stocks
+        Potential_Adopters.equation = { - adoptionRate }
+        Adopters.equation = { adoptionRate }
+
+        // - 4d. Flows
+        adoptionRate.equation = { adoptionFromAdvertising + adoptionFromWordOfMouth }
+
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/models/ModelSimpleCompoundInterest.kt

@@ -0,0 +1,100 @@
+package hr.unipu.ksdtoolkit.models
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+
+/**
+ * SD model of Simple Compound Interest.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+open class ModelSimpleCompoundInterest : Model() {
+
+    // Static properties:
+    companion object {
+        const val INTEREST_RATE_KEY = "INTEREST_RATE"
+        const val INITIAL_CAPITAL_KEY = "INITIAL_CAPITAL"
+        const val INTEREST_KEY = "interest"
+        const val CAPITAL_KEY = "Capital"
+
+        const val INTEREST_RATE_VALUE = 0.1 / 12
+        const val INITIAL_CAPITAL_VALUE = 100.0
+        const val INITIAL_TIME_VALUE = 0.0
+        const val FINAL_TIME_VALUE = 120.0
+        const val TIME_STEP_VALUE = 0.25
+    }
+
+
+    // 1. Create the model (with setup of: time boundaries & time step & integrationType type)
+    val model = this   // inheritance: Model()
+    // alternative:
+    //val model = Model(INITIAL_TIME_VALUE, FINAL_TIME_VALUE, TIME_STEP_VALUE, EulerIntegration())
+
+
+    init {
+
+        // override default model properties:
+        model.initialTime = INITIAL_TIME_VALUE
+        model.finalTime = FINAL_TIME_VALUE
+        model.timeStep = TIME_STEP_VALUE
+        model.integrationType = EulerIntegration()
+        model.name = "Simple Compound Interest Model"   // name is optional
+        model.timeUnit = "month"        // timeUnit is optional
+
+    }
+
+
+    // 2. Create all system elements:
+
+    // - 2a. Variables
+    val INTEREST_RATE = model.constant(INTEREST_RATE_KEY)       // Using: constant() function
+    val INITIAL_CAPITAL = model.constant(INITIAL_CAPITAL_KEY)   // Using: constant() function
+
+    // - 2b. Stocks
+    val Capital = model.stock(CAPITAL_KEY)                      // Using: stock() function
+
+    // - 2c. Flows
+    val interest = model.flow(INTEREST_KEY)                     // Using: flow() function
+
+    // - 2e. Modules
+
+
+    init {
+
+        // - 2f. (Optional): Entities' descriptions
+        INTEREST_RATE.description = "Annual flow rate in [%/year]"
+        INITIAL_CAPITAL.description = "Initial capital in [EUR] in the beginning of the simulation."
+        Capital.description = "Accumulated capital in [EUR] at specific point in time."
+        interest.description = "Interest flow in [EUR / chosen unit of time], " +
+                               "e.g. [EUR/month] due to paying flow on the Capital."
+
+        // - 2g. (Optional): Entities' units
+        INTEREST_RATE.unit = "%/year"
+        INITIAL_CAPITAL.unit = "€"
+        Capital.unit = "€"
+        interest.unit = "€/month"
+
+
+        // 3. Initial values:
+
+        // - 3a. Stocks
+        Capital.initialValue = { INITIAL_CAPITAL }      // Accepts: Double or ModelEntity
+
+
+
+        // 4. Equations:
+
+        // - 4a. Variables
+        INTEREST_RATE.equation = { INTEREST_RATE_VALUE }
+        INITIAL_CAPITAL.equation = { INITIAL_CAPITAL_VALUE }
+
+        // - 4b. Stocks
+        Capital.equation = { interest }     // Function type can be either Double or ModelEntity.
+
+        // - 4c. Converters:
+        interest.equation = { Capital * INTEREST_RATE }
+
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/models/ModelTestSpeed.kt

@@ -0,0 +1,92 @@
+package hr.unipu.ksdtoolkit.models
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+
+/**
+ * SD model of Simple Compound Interest.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+open class ModelTestSpeed : Model() {
+
+    // Static properties:
+    companion object {
+        const val INITIAL_STOCK_KEY = "INITIAL_STOCK"
+        const val FLOW_KEY = "flow"
+        const val STOCK_KEY = "Stock"
+
+        const val INITIAL_STOCK_VALUE = 1      // []
+        const val FLOW_VALUE = 1               // []
+        const val INITIAL_TIME_VALUE = 0       // []
+        const val FINAL_TIME_VALUE = 1e7       // []    1e7 for comparison (Vensim = cca30sec., BPTK-Py = cca153sec.)
+        const val TIME_STEP_VALUE = 1          // []
+    }
+
+
+    // Time_steps=1e3 -> Time elapsed=0.093  -> 0.036 sec
+    // Time_steps=1e4 -> Time elapsed=0.192  -> 0.099 sec
+    // Time_steps=1e5 -> Time elapsed=0.704  -> 0.389 sec
+    // Time_steps=1e6 -> Time elapsed=4.367  -> 1.034 sec
+    // Time_steps=1e7 -> Time elapsed=27.99  -> 7.082 sec
+
+    init {
+
+        // 1. Create the model (with setup of: time boundaries & time step & integrationType type)
+        val model = this
+
+        // override default model properties:
+        model.initialTime = INITIAL_TIME_VALUE
+        model.finalTime = FINAL_TIME_VALUE
+        model.timeStep = TIME_STEP_VALUE
+        model.integrationType = EulerIntegration()
+        model.name = "SD Model for testing speed"   // name is optional
+
+
+
+        // 2. Create all system elements:
+
+        // - 2a. Variables (Constants)
+        val INITIAL_STOCK = model.constant(INITIAL_STOCK_KEY)
+
+        // - 2b. Variables (Converters)
+
+        // - 2c. Stocks
+        val Stock = model.stock(STOCK_KEY)
+
+        // - 2d. Flows
+        val flow = model.flow(FLOW_KEY)
+
+        // - 2e. Modules
+
+        // - 2f. (Optional): Entities' descriptions
+
+
+
+        // 3. Initial values:
+
+        // - 3a. Stocks
+        Stock.initialValue = { INITIAL_STOCK }      // Accepts: Double, Int or ModelEntity
+
+
+
+        // 4. Equations:
+
+        // - 4a. Constants
+        INITIAL_STOCK.equation = { INITIAL_STOCK_VALUE }
+
+        // - 4b. Converters
+
+        // - 4c. Stocks
+        Stock.equation = { flow }  // Function type can be either Double or ModelEntity.
+
+        // - 4d. Flows:
+        flow.equation = { 1.0 }    // Simplified converters so that only equations are used.
+
+        // - 4e. Modules:
+
+
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/modules/ModuleGenericCompoundDecrease.kt

@@ -0,0 +1,97 @@
+package hr.unipu.ksdtoolkit.modules
+
+import hr.unipu.ksdtoolkit.entities.Model
+
+/**
+ * SD model of Simple Compound Interest.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+open class ModuleGenericCompoundDecrease : Model() {
+
+    // Static properties:
+    companion object {
+        const val CONSTANT_KEY = "CONSTANT"
+        const val CONVERTER_KEY = "converter"
+        const val INITIAL_STOCK_KEY = "INITIAL_STOCK"
+        const val OUTFLOW_KEY = "outflow"
+        const val INFLOW_KEY = "inflow"
+        const val STOCK_KEY = "Stock"
+
+        const val CONSTANT_VALUE = 10.0           // [%]
+        const val INITIAL_STOCK_VALUE = 100.0     // [€]
+    }
+
+
+    // 1. Create the model (with setup of: time boundaries & time step & integrationType type)
+    val model = this   // inheritance: Model()
+    // alternative: Model(INITIAL_TIME_VALUE, FINAL_TIME_VALUE, TIME_STEP_VALUE, EulerIntegration())
+
+
+    init {
+        // override default model properties:
+        model.name = "Generic Compound Decrease Module"   // name is optional
+    }
+
+
+    // 2. Create all system elements:
+
+    // - 2a. Variables: Constants
+    val CONSTANT = model.constant(CONSTANT_KEY)
+    val INITIAL_STOCK = model.constant(INITIAL_STOCK_KEY)
+
+    // - 2b. Variable: Converters
+    val converter = model.converter(CONVERTER_KEY)
+
+    // - 2c. Stocks
+    val Stock = model.stock(STOCK_KEY)
+
+    // - 2d. Flows
+    val inflow = model.flow(INFLOW_KEY)
+    val outflow = model.flow(OUTFLOW_KEY)
+
+    // - 2e. Modules
+    // n/a
+
+    init {
+        // - 2f. (Optional): Entities' descriptions
+        CONSTANT.description = "Annual flow rate in [%/year]"
+        INITIAL_STOCK.description = "Initial capital in [EUR] in the beginning of the simulation."
+        converter.description = "Converts percentage to decimal."
+        Stock.description = "Accumulated capital in [EUR] at specific point in time."
+        inflow.description = "Interest inflow in [EUR / chosen unit of time], e.g. [EUR/month]"
+        outflow.description = "Interest outflow in [EUR / chosen unit of time], e.g. [EUR/month]"
+
+
+
+        // 3. Initial values:
+
+        // - 3a. Stocks
+        Stock.initialValue = { INITIAL_STOCK }      // Accepts: Double, Int or ModelEntity
+
+
+
+        // 4. Equations:
+
+        // - 4a. Variables (Constants)
+        CONSTANT.equation = { CONSTANT_VALUE }
+        INITIAL_STOCK.equation = { INITIAL_STOCK_VALUE }
+
+        // - 4b. Variables (Converters)
+        converter.equation = { CONSTANT / 100.0 / 12.0 }
+
+        // - 4c. Stocks
+        Stock.equation = { inflow - outflow }     // Function type can be either Double or ModelEntity.
+
+        // - 4d. Flows:
+        inflow.equation = { }                       // Not defined. Can be also defined as: { null }. Module input.
+        outflow.equation = { Stock * converter }    // Simplified converters so that only equations are used.
+
+        // - 4e. Modules:
+        // n/a
+
+
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/outputs/CsvExporter.kt

@@ -0,0 +1,98 @@
+package hr.unipu.ksdtoolkit.outputs
+
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.simulations.ISimulationEventHandler
+import org.slf4j.LoggerFactory
+import java.io.FileWriter
+import java.io.IOException
+import java.util.logging.Level
+import java.util.logging.Logger
+
+/**
+ * Class for exporting simulation data in CSV format
+ * (also implements the [SimulationEventListener] interface).
+ */
+class CsvExporter(private val csvFile: String = "output.csv",       // Default name.
+                  private val separator: String = ";"               // Default separator.
+) : ISimulationEventHandler {
+
+    val sb = StringBuilder()
+
+    private val string: String
+        get() {
+            val last = sb.lastIndexOf("\n")
+            if (last >= 0 && sb.length - last == 1) {
+                sb.delete(last, sb.length)
+            }
+            return sb.toString()
+        }
+
+
+    /**
+     * Implementation of method simulationInitialized() from ISimulationEventHandler interface.
+     * Method 1) clears StringBuilder content and 2) writes simulation data, after initialization.
+     */
+    override fun simulationInitialized(model: Model) {
+        clearContent()
+        writeTimeStepValues(model.modelEntitiesKeys)
+    }
+
+    /**
+     * Implementation of method simulationInitialized() from ISimulationEventHandler interface.
+     * Method 1) clears StringBuilder content and 2) writes simulation data, after every time step.
+     */
+    override fun timeStepCalculated(model: Model) {
+        writeTimeStepValues(model.modelEntitiesValues)
+    }
+
+    /**
+     * Implementation of method simulationInitialized() from ISimulationEventHandler interface.
+     * Method saves simulation data into CSV file, after simulation is finished.
+     */
+    override fun simulationFinished(model: Model) {
+        saveFile()
+    }
+
+
+    /**
+     * Clear CSV content.
+     */
+    private fun clearContent() {
+        sb.delete(0, sb.length)
+    }
+
+
+    /**
+     * Write all simulation data for one timestep to the CSV.
+     *
+     * @param modelEntityValues values of the model entities.
+     */
+    private fun writeTimeStepValues(modelEntityValues: List<String>) {
+        var first = true
+        for (value in modelEntityValues) {
+            if (!first) {
+                sb.append(separator)
+            }
+            sb.append(value)
+            first = false
+        }
+        sb.append("\n")
+    }
+
+    /**
+     * Save data to CSV file.
+     */
+    private fun saveFile() {
+        try {
+            FileWriter(csvFile).use { writer ->
+                writer.append(string)
+                writer.flush()
+                LoggerFactory.getLogger(javaClass).info("CSV file saved.")
+            }
+        } catch (exception: IOException) {
+            LoggerFactory.getLogger(javaClass).error("Unable to save file.", exception)
+        }
+    }
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/outputs/PngExporter.kt

@@ -0,0 +1,50 @@
+package hr.unipu.ksdtoolkit.outputs
+
+import hr.unipu.ksdtoolkit.entities.Model
+import javafx.application.Application.launch
+import javafx.application.Platform
+import hr.unipu.ksdtoolkit.simulations.ISimulationEventHandler
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import javafx.application.Application
+import javafx.stage.Stage
+import org.slf4j.LoggerFactory
+import java.lang.IllegalStateException
+
+
+/**
+ * Class that implements the [SimulationEventListener] interface and controls the chart plotting.
+ */
+class PngExporter(fileName: String) : ISimulationEventHandler {
+
+    companion object {
+        lateinit var simulation: Simulation
+    }
+
+    init {
+        PngExporterApp.fileName = fileName
+        PngExporterApp.model = simulation.model
+        PngExporterApp.simulation = simulation
+    }
+
+    override fun simulationInitialized(model: Model) {
+        PngExporterApp.addSeries(model.modelEntitiesKeys)
+    }
+
+    override fun timeStepCalculated(model: Model) {
+        PngExporterApp.addValues(model.modelEntitiesValues, model.currentTime)
+    }
+
+    override fun simulationFinished(model: Model) {
+        // Application is not just a window, it's a Process.
+        // Thus only one Application.launch() is allowed per VM.
+        try {
+            LoggerFactory.getLogger(javaClass).info("PngExporterApp launching attempt.")
+            PngExporterApp.pngExporterListener = this
+            launch(PngExporterApp::class.java)
+
+        } catch (exception: IllegalStateException) {
+            LoggerFactory.getLogger(javaClass).error("PngExporterApp launching failed.", exception)
+        }
+
+    }
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/outputs/PngExporterApp.kt

@@ -0,0 +1,186 @@
+package hr.unipu.ksdtoolkit.outputs
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.simulations.ISimulationEventHandler
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import javafx.application.Application
+import javafx.application.Platform
+import javafx.embed.swing.SwingFXUtils
+import javafx.scene.Group
+import javafx.scene.Scene
+import javafx.scene.chart.LineChart
+import javafx.scene.chart.NumberAxis
+import javafx.scene.chart.XYChart
+import javafx.scene.chart.XYChart.Series
+import javafx.scene.layout.BorderPane
+import javafx.stage.Stage
+import org.slf4j.LoggerFactory
+
+import javax.imageio.ImageIO
+import java.io.File
+import java.text.NumberFormat
+import java.text.ParseException
+import java.util.ArrayList
+import java.util.Locale
+import kotlin.time.measureTimedValue
+
+/**
+ * JavaFX app for chart plotting & exporting.
+ */
+class PngExporterApp : Application() {
+
+    companion object {
+
+        lateinit var model: Model
+        lateinit var simulation: Simulation
+        lateinit var pngExporterListener: ISimulationEventHandler
+
+        var fileName: String = "outputs.png"   
+        lateinit var series: ArrayList<Series<Number, Number>>
+        private var width = 800.0
+        private var height = 600.0
+
+        /**
+         * Add series names to the chart.
+         *
+         * @param modelEntityNames list of model entity names.
+         */
+        fun addSeries(modelEntityNames: List<String>) {
+            series = ArrayList<Series<Number, Number>>()
+            for (modelEntityName in modelEntityNames) {
+                val s = Series<Number, Number>()     
+                s.name = modelEntityName
+                series.add(s)       
+            }
+        }
+
+        /**
+         * Add values to the chart series.
+         *
+         * @param modelEntityValues list of model entity values.
+         * @param currentTime       current model time.
+         */
+        fun addValues(modelEntityValues: List<String>, currentTime: Double) {
+            for (i in modelEntityValues.indices) {
+                val valueString = modelEntityValues[i]
+                val format = NumberFormat.getInstance(Locale.US)
+                val number: Number
+                try {
+                    number = format.parse(valueString)
+                    val value = number.toDouble()
+                    series[i].data?.add(XYChart.Data(currentTime, value))
+                } catch (exception: ParseException) {
+                    LoggerFactory.getLogger(javaClass).error("Error with parsing model entity values.", exception)
+                }
+
+            }
+        }
+
+        /**
+         * Set scene width and height.
+         *
+         * @param width  width.
+         * @param height height.
+         */
+        fun setSize(width: Double, height: Double) {
+            Companion.width = width
+            Companion.height = height
+        }
+
+        /**
+         * Save the chart as an image.
+         *
+         * @param scene Scene
+         */
+        private fun saveToFile(scene: Scene) {
+            val image = scene.snapshot(null)
+            val outputFile = File(fileName)
+            val bImage = SwingFXUtils.fromFXImage(image, null)
+            ImageIO.write(bImage, "png", outputFile)
+            LoggerFactory.getLogger(javaClass).info("PNG file saved.")
+        }
+    }
+
+
+    override fun start(stage: Stage) {
+
+        LoggerFactory.getLogger(javaClass).info("PngExporterApp started.")
+
+        val root = Group()
+
+        val scene = Scene(root, width, height)
+
+        val lineChart = createLineChart(model.name)
+        lineChart.createSymbols = false
+        lineChart.stylesheets.add("/Style2.css")
+        lineChart.data.addAll(series)
+
+        val borderPane = BorderPane()
+        borderPane.prefHeightProperty().bind(scene.heightProperty())
+        borderPane.prefWidthProperty().bind(scene.widthProperty())
+        borderPane.center = lineChart
+
+        root.children.add(borderPane)
+
+        saveToFile(scene)
+
+        stage.scene = scene
+        stage.show()
+
+        val doOutputHandlersContainOtherJavaFxApp = simulation.outputHandlers.any {
+            it.javaClass.name == "hr.unipu.ksdtoolkit.outputs.WinSimulator"
+        }
+        if (doOutputHandlersContainOtherJavaFxApp) {
+            simulation.outputHandlers.remove(pngExporterListener)
+            Platform.setImplicitExit(true)
+            Platform.runLater { WinSimulatorApp().start(Stage()) }
+        }
+        LoggerFactory.getLogger(javaClass).info("PngExporterApp exit.")
+
+    }
+
+
+    /**
+     * Create LineChart.
+     *
+     * @param title line chart title
+     * @return line chart
+     */
+    private fun createLineChart(title: String): LineChart<Number, Number> {
+
+        val xAxis = NumberAxis()
+        val yAxis = NumberAxis()
+        xAxis.label = "Time [${model.timeUnit}]"
+        yAxis.label = "Value []"
+
+        val lineChart = LineChart(xAxis, yAxis)
+
+        lineChart.animated = false
+
+        setAxisBounds(lineChart,
+            min = simulation.model.initialTime.toDouble(),
+            max = simulation.model.finalTime.toDouble(),
+            isXAxis = true
+        )
+
+        lineChart.title = title
+        return lineChart
+    }
+
+
+    /**
+     * Setting axis bounds.
+     */
+    fun setAxisBounds(myChart: LineChart<Number, Number>, min: Double, max: Double, isXAxis: Boolean) {
+        val axis: NumberAxis = if (isXAxis) {
+            myChart.xAxis as NumberAxis
+        } else {
+            myChart.yAxis as NumberAxis
+        }
+        axis.isAutoRanging = false
+        axis.lowerBound = min
+        axis.upperBound = max
+    }
+
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/outputs/WinSimulator.kt

@@ -0,0 +1,48 @@
+package hr.unipu.ksdtoolkit.outputs
+
+import hr.unipu.ksdtoolkit.entities.Constant
+import hr.unipu.ksdtoolkit.entities.Model
+import javafx.application.Application.launch
+import hr.unipu.ksdtoolkit.simulations.ISimulationEventHandler
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import org.slf4j.LoggerFactory
+
+
+/**
+ * Class that implements the [ISimulationEventHandler] interface and controls the chart printing.
+ *
+ */
+class WinSimulator() : ISimulationEventHandler {
+
+    companion object {
+        lateinit var simulation: Simulation
+    }
+
+    init {
+        WinSimulatorApp.simulation = simulation
+    }
+
+    override fun simulationInitialized(model: Model) {
+        WinSimulatorApp.addSeriesNames(model.modelEntitiesKeys)
+        WinSimulatorApp.addSeriesConstants(model.entities.filterValues { it is Constant })
+
+    }
+
+    override fun timeStepCalculated(model: Model) {
+        WinSimulatorApp.addSeriesValues(model.modelEntitiesValues, model.currentTime)
+    }
+
+    override fun simulationFinished(model: Model) {
+        try {
+            // Application is not just a window, it's a Process.
+            // Thus only one Application#launch() is allowed per VM.
+            LoggerFactory.getLogger(javaClass).info("WinSimulatorApp launching attempt.")
+            WinSimulatorApp.winSimulatorListener = this
+            launch(WinSimulatorApp::class.java)
+
+        } catch (exception: IllegalStateException) {
+            LoggerFactory.getLogger(javaClass).error("WinSimulatorApp launching failed.", exception)
+        }
+
+    }
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/outputs/WinSimulatorApp.kt

@@ -0,0 +1,351 @@
+package hr.unipu.ksdtoolkit.outputs
+
+import javafx.application.Application
+import javafx.embed.swing.SwingFXUtils
+import javafx.event.ActionEvent
+import javafx.event.EventHandler
+import javafx.geometry.Insets
+import javafx.scene.Cursor
+import javafx.scene.Scene
+import javafx.scene.chart.LineChart
+import javafx.scene.chart.NumberAxis
+import javafx.scene.chart.XYChart
+import javafx.scene.chart.XYChart.Series
+import javafx.scene.control.*
+import javafx.scene.input.MouseButton
+import javafx.scene.layout.BorderPane
+import javafx.scene.layout.VBox
+import javafx.stage.Stage
+import hr.unipu.ksdtoolkit.entities.ModelEntity
+import hr.unipu.ksdtoolkit.simulations.ISimulationEventHandler
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import javafx.application.Platform
+import javafx.event.Event
+import javafx.scene.input.KeyCode
+import javafx.scene.input.KeyEvent
+import org.slf4j.LoggerFactory
+
+import javax.imageio.ImageIO
+import java.io.File
+import java.io.IOException
+import java.text.NumberFormat
+import java.text.ParseException
+import java.util.ArrayList
+import java.util.Locale
+import java.util.logging.Level
+import java.util.logging.Logger
+
+/**
+ * JavaFX app for chart plotting and interactive simulation.
+ */
+class WinSimulatorApp : Application() {
+
+    companion object {
+
+        private lateinit var scene: Scene
+        private lateinit var series: ArrayList<Series<Number, Number>>
+        private lateinit var seriesConstants: ArrayList<Series<Number, Number>>
+        private lateinit var checkBoxes: ArrayList<CheckBox>
+        private lateinit var textFields: ArrayList<VBox>
+        private lateinit var lineChart: LineChart<Number, Number>
+        private var width = 800.0
+        private var height = 600.0
+
+
+        lateinit var simulation: Simulation
+        lateinit var winSimulatorListener: ISimulationEventHandler
+
+        /**
+         * Add names of entities to names of series.
+         *
+         * @param modelEntityNames list of model entity names.
+         */
+        fun addSeriesNames(modelEntityNames: List<String>) {
+            series = ArrayList()
+            for (modelEntityName in modelEntityNames) {
+                val s = Series<Number, Number>()
+                s.name = modelEntityName
+                series.add(s)
+            }
+        }
+
+        /**
+         * Add constants for text fields.
+         *
+         * @param modelEntityConstants list of model entity (constants) names.
+         */
+        fun addSeriesConstants(modelEntityConstants: Map<String, ModelEntity>) {
+            seriesConstants = ArrayList()
+            for (modelEntityConstant in modelEntityConstants) {
+                val s = Series<Number, Number>()
+                s.name = modelEntityConstant.key
+                val value = modelEntityConstant.value.currentValue
+                s.data.add(XYChart.Data(0.0, value))
+                seriesConstants.add(s)
+            }
+        }
+
+        /**
+         * Add values to chart series.
+         *
+         * @param modelEntityValues list of model entity values.
+         * @param currentTime       current model time.
+         */
+        fun addSeriesValues(modelEntityValues: List<String>, currentTime: Double) {
+            for (i in modelEntityValues.indices) {
+                val valueString = modelEntityValues[i]
+                val format = NumberFormat.getInstance(Locale.US)
+                val number: Number
+                try {
+                    number = format.parse(valueString)
+                    val value = number.toDouble()
+                    series[i].data?.add(XYChart.Data(currentTime, value))
+                } catch (ex: ParseException) {
+                    Logger.getLogger(WinSimulatorApp::class.java.getName()).log(Level.SEVERE, null, ex)
+                }
+            }
+        }
+
+
+        /**
+         * Set scene width and height.
+         *
+         * @param width  width.
+         * @param height height.
+         */
+        fun setSize(width: Double, height: Double) {
+            Companion.width = width
+            Companion.height = height
+        }
+
+        /**
+         * Save the chart as an image.
+         *
+         * @param scene Scene
+         */
+        private fun saveToFile(scene: Scene) {
+            val image = scene.snapshot(null)
+            val outputFile = File("chart.png")
+            val bImage = SwingFXUtils.fromFXImage(image, null)
+            try {
+                ImageIO.write(bImage, "png", outputFile)
+            } catch (e: IOException) {
+                throw RuntimeException(e)
+            }
+
+        }
+    }
+
+    override fun start(stage: Stage) {
+
+        LoggerFactory.getLogger(javaClass).info("WinSimulatorApp started.")
+
+        stage.title = "WinSimulator"
+        val root = BorderPane()
+
+        scene = Scene(root, width, height)
+
+        lineChart = this.createLineChart("")
+        lineChart.data.addAll(series)
+        lineChart.cursor = Cursor.CROSSHAIR
+        lineChart.animated = false
+        addTooltips()
+        addLineChartContextMenu()
+
+        checkBoxes = ArrayList()
+        for (s in series) {
+            val cb = CheckBox(s.name)
+            cb.onAction = EventHandler<ActionEvent> { this.updateLineChart(it) }
+            cb.isSelected = true
+            checkBoxes.add(cb)
+        }
+
+        textFields = ArrayList()
+        for (s in seriesConstants) {
+
+            val tf1 = Label(s.name)
+            val tf2 = TextField(s.data[0].yValue.toString())
+            val tf3 = VBox(tf1, tf2)
+
+            tf2.onAction = EventHandler<ActionEvent> { this.reRunSimulation(it) }
+
+            tf2.onKeyPressed = EventHandler<KeyEvent> {
+                if (it.code == KeyCode.TAB) {
+                    this.reRunSimulation(it)
+                }
+            }
+
+            textFields.add(tf3)
+        }
+
+
+        val dataLabel1 = Label("Constants:")
+        val vbox1 = VBox(8.0)
+        vbox1.children.addAll(dataLabel1)
+        vbox1.children.addAll(textFields)
+        vbox1.padding = Insets(20.0, 10.0, 20.0, 10.0)
+
+        val dataLabel2 = Label("Entities:")
+        val vbox2 = VBox(8.0)
+        vbox2.children.addAll(dataLabel2)
+        vbox2.children.addAll(checkBoxes)
+        vbox2.padding = Insets(20.0, 10.0, 20.0, 0.0)
+
+        root.left = vbox1
+        root.center = lineChart
+        root.right = vbox2
+
+        stage.scene = scene
+        stage.show()
+
+        val doOutputHandlersContainOtherJavaFxApp =
+            simulation.outputHandlers.any { it.javaClass.name == "hr.unipu.ksdtoolkit.outputs.PngExporter" }
+        if (doOutputHandlersContainOtherJavaFxApp) {
+            simulation.outputHandlers.remove(winSimulatorListener)
+
+            Platform.setImplicitExit(true)
+
+            Platform.runLater { PngExporterApp().start(Stage()) }
+
+        }
+
+    }
+
+
+    /**
+     * Re-run simulation (with new value of model constant).
+     *
+     * @param event Event
+     */
+    private fun reRunSimulation(event: Event) {
+
+        val tf = event.source as TextField
+        val text = tf.text
+        val label = (tf.parent.childrenUnmodifiable[0] as Label).text
+
+        val isModuleEntity = label.contains('.')
+        val moduleName = label.substringBefore(".")
+        val entityName = label.substringAfter(".")
+
+        val oldValue =
+            if (isModuleEntity) {
+                simulation.model.modules[moduleName]?.entities?.get(entityName)?.currentValue
+            } else {
+                simulation.model.entities[label]?.currentValue
+            }
+
+        val newValue = try {
+                text.toDouble()
+            } catch (exception: Exception) {
+                LoggerFactory.getLogger(javaClass).error("WinSimulatorApp: incorrect input.", exception)
+                tf.text = oldValue.toString()
+                oldValue
+            }
+
+        if (isModuleEntity) {
+            simulation.model.modules[moduleName]?.entities?.get(entityName)?.equation = { newValue }
+        } else {
+            simulation.model.entities[label]?.equation = { newValue }
+        }
+
+        simulation.run()
+
+        refreshChart()
+
+    }
+
+
+    /**
+     * Add/remove lines from chart.
+     *
+     * @param event Event
+     */
+    private fun updateLineChart(event: Event) {
+        val checkBox = event.source as CheckBox
+        val text = checkBox.text
+        for (s in series) {
+            if (text == s.name) {
+                if (checkBox.isSelected) {
+                    lineChart.data.add(s)
+                } else {
+                    lineChart.data.remove(s)
+                }
+            }
+        }
+    }
+
+
+    /**
+     * Refresh whole chart.
+     */
+    private fun refreshChart() {
+        lineChart.data?.clear()
+        for (s in series) {
+            for (cb in checkBoxes) {
+                val textCheckBox = cb.text
+                if (textCheckBox == s.name) {
+                    if (cb.isSelected) {
+                        lineChart.data.add(s)
+                    } else {
+                        lineChart.data.remove(s)
+                    }
+                }
+            }
+        }
+    }
+
+
+    /**
+     * Create a LineChart
+     *
+     * @param title line chart title
+     * @return line chart
+     */
+    private fun createLineChart(title: String): LineChart<Number, Number> {
+
+        val xAxis = NumberAxis()
+        val yAxis = NumberAxis()
+        xAxis.label = "Time"
+        yAxis.label = "Value"
+
+        val lineChart = LineChart(xAxis, yAxis)
+        lineChart.title = title
+
+        return lineChart
+    }
+
+
+    /**
+     * Add a context menu to line chart.
+     */
+    private fun addLineChartContextMenu() {
+        val saveAsFile = MenuItem("Save as file.")
+        saveAsFile.setOnAction { event -> saveToFile(scene) }
+        val menu = ContextMenu(saveAsFile)
+        lineChart.setOnMouseClicked { event ->
+            if (MouseButton.SECONDARY == event.button) {
+                menu.show(lineChart, event.screenX, event.screenY)
+            }
+        }
+    }
+
+
+    /**
+     * Add tooltips to chart.
+     */
+    private fun addTooltips() {
+
+        for (i in 0 until lineChart.data.size) {
+            for (j in 0 until lineChart.data[i].data.size) {
+                val dot = lineChart.data[i].data[j]
+                Tooltip.install(dot.node, Tooltip("Time  = ${dot.xValue}\n" +
+                                                       "Value = ${dot.yValue}"))
+
+                dot.node.setOnMouseEntered { event -> dot.node.styleClass.add("onHover") }
+                dot.node.setOnMouseExited { event -> dot.node.styleClass.remove("onHover") }
+            }
+        }
+    }
+
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/simulations/ISimulationEventHandler.kt

@@ -0,0 +1,21 @@
+package hr.unipu.ksdtoolkit.simulations
+
+import hr.unipu.ksdtoolkit.entities.Model
+
+interface ISimulationEventHandler {
+    /**
+     * Handler for a simulation initialization event.
+     */
+    fun simulationInitialized(model: Model)
+
+    /**
+     * Handler for a finished calculation for one time step.
+     */
+    fun timeStepCalculated(model: Model)
+
+    /**
+     * Handler for a finished simulation event.
+     */
+    fun simulationFinished(model: Model)
+
+}

ksdtoolkit-core/src/main/kotlin/hr.unipu.ksdtoolkit/simulations/Simulation.kt

@@ -0,0 +1,315 @@
+package hr.unipu.ksdtoolkit.simulations
+
+import hr.unipu.ksdtoolkit.entities.*
+import hr.unipu.ksdtoolkit.outputs.CsvExporter
+import hr.unipu.ksdtoolkit.outputs.PngExporter
+import hr.unipu.ksdtoolkit.outputs.WinSimulator
+import org.slf4j.LoggerFactory
+
+
+/**
+ * Simulation class represents & controls SD simulation.
+ */
+class Simulation(val model: Model) {
+
+    val outputHandlers = ArrayList<ISimulationEventHandler>()
+
+    var timeElapsed = 0.0
+    val timeSteps = (model.finalTime.toDouble() - model.initialTime.toDouble()) / model.timeStep.toDouble()
+
+    /**
+     * Running simulation.
+     */
+    fun run() {
+
+        val start = System.currentTimeMillis()
+
+        runAllPreparations()
+        while (this.finalTimeReached()) {
+            runOneTimeStep()
+
+
+            timeElapsed = (System.currentTimeMillis() - start) / 1000.0
+        }
+
+        LoggerFactory.getLogger(javaClass).info("   Simulation current time (finished): ${model.currentTime}")
+        LoggerFactory.getLogger(javaClass).info("   TOTAL TIME ELAPSED: $timeElapsed \n")
+
+        this.fireSimulationFinishedEvent(model)
+    }
+
+
+
+    /**
+     * Prepare all before while loop integration.
+     */
+    fun runAllPreparations() {
+        this.copyModuleEntitiesToParent()
+        this.prepareInitialValues()
+        this.prepareValuesForFirstTimestep()
+        this.fireSimulationInitializedEvent(this.model)
+        this.executeConverters()
+        this.fireTimeStepCalculatedEvent(this.model)
+    }
+
+
+    /**
+     * Run integration for one time step.
+     */
+    fun runOneTimeStep() {
+        this.updateCurrentTime()
+        this.prepareValuesForNextTimestep()
+        this.model.integrationType.integrate()
+        this.executeConverters()
+        this.fireTimeStepCalculatedEvent(this.model)
+    }
+
+
+    /**
+     * Copy all module entities into the parent model before simulation.
+     */
+    private fun copyModuleEntitiesToParent() {
+        for (( moduleName , module) in model.modules) {
+            module.entities.forEach { ( modelEntityName , modelEntity) ->
+                modelEntity.name = "${moduleName}.${modelEntityName}"
+                if (!model.entities.containsKey(modelEntity.name))
+                    model.addModelEntity(modelEntity)
+            }
+        }
+    }
+
+
+    /**
+     * Prepare all initial model values for running the simulation.
+     */
+    private fun prepareInitialValues() {
+        this.model.currentTime = this.model.initialTime.toDouble()
+        this.model.entities.forEach { (k, v) ->
+            when (v) {
+                is Stock -> {
+                    v.currentValue = v._initialValue?.invoke() ?: 0.0
+                }
+                is Constant -> {
+                    v.currentValue = v._equation?.invoke() ?: 0.0
+                }
+            }
+            v.isCurrentValueCalculated = false
+        }
+        this.model.integrationType.stocks = model.stocks
+        this.model.integrationType.converters = model.converters
+        this.model.integrationType.dt = model.timeStep.toDouble()
+
+    }
+
+
+    /**
+     * Prepare all Stocks whose current value is already calculated
+     * for the first timestep.
+     */
+    private fun prepareValuesForFirstTimestep() {
+        this.model.entities.forEach { (k, v) ->
+            if (v is Stock && this.model.currentTime == this.model.initialTime) {
+                v.isCurrentValueCalculated = true
+            }
+            if (v is Constant && this.model.currentTime == this.model.initialTime) {
+                v.isCurrentValueCalculated = true
+            }
+        }
+    }
+
+
+    /**
+     * Fires an event for the initialization of the simulation.
+     *
+     * @param model [Model] for the simulation.
+     */
+    private fun fireSimulationInitializedEvent(model: Model) {
+        this.outputHandlers.forEach { listener -> listener.simulationInitialized(this.model) }
+    }
+
+
+    /**
+     * Execute the converters.
+     */
+    private fun executeConverters() {
+        for (converter in this.model.converters) {
+            if (!converter.targetEntity.isCurrentValueCalculated) {
+                converter.convert()
+            }
+        }
+
+        var hasSucceeded = false
+        var numberOfTries = 0
+        while (!hasSucceeded && numberOfTries<10) {
+            numberOfTries++
+            this.model.entities.forEach { (_, v) ->
+                val invocationResult = v._equation?.invoke()
+                if (v.isCurrentValueCalculated && invocationResult != null) {
+                    when (v) {
+                        is Converter -> {
+                            v.currentValue = invocationResult
+                            v.isCurrentValueCalculated = true
+
+                        }
+                        is Flow -> {
+                            v.currentValue = invocationResult
+                            v.isCurrentValueCalculated = true
+
+                        }
+                    }
+                }
+            }
+            if (this.model.entities.all { it.value.isCurrentValueCalculated } ) {
+                hasSucceeded = true
+            } else {
+
+                this.model.entities.filter { it.value.isCurrentValueCalculated == false }.forEach {
+
+                }
+
+            }
+        }
+
+
+        this.model.entities.filter { !it.value.isCurrentValueCalculated }.forEach { (_, v) ->
+            val invocationResult = v._equation?.invoke()
+            if (!v.isCurrentValueCalculated) {
+                LoggerFactory.getLogger(javaClass).info("Not yet calculated: ${v.toString()}")
+            }
+        }
+
+
+    }
+
+
+    /**
+     * Fire an event for a finished calculation of a time step.
+     *
+     * @param model [Model] for the simulation.
+     */
+    private fun fireTimeStepCalculatedEvent(model: Model) {
+        this.outputHandlers.forEach { listener -> listener.timeStepCalculated(model) }
+    }
+
+
+    /**
+     * Update the current time by adding one time step.
+     */
+    private fun updateCurrentTime() {
+        model.currentTime = model.currentTime + model.timeStep.toDouble()
+
+        if ( (model.currentTime / model.timeStep.toDouble()).rem(timeSteps / 10.0) == 0.0 ) {
+            LoggerFactory.getLogger(javaClass).
+                info("   Simulation percentage: ${model.currentTime / model.timeStep.toDouble() / timeSteps * 100}%, " +
+                        "Simulation current time: ${model.currentTime}")
+            LoggerFactory.getLogger(javaClass).
+                info("   Time elapsed: $timeElapsed")
+        }
+    }
+
+
+    /**
+     * Prepare all values for the next timestep.
+     */
+    private fun prepareValuesForNextTimestep() {
+        this.model.entities.forEach { (_, v) ->
+            v.previousValue = v.currentValue
+            when (v) {
+                is Constant -> v.isCurrentValueCalculated = true
+                else -> v.isCurrentValueCalculated = false
+            }
+        }
+    }
+
+
+    /**
+     * Method that controls if the final time has been reached.
+     *
+     * @return <tt>true</tt> only if the final time has been reached.
+     */
+    private fun finalTimeReached(): Boolean {
+        return this.model.currentTime < this.model.finalTime.toDouble()
+    }
+
+
+    /**
+     * Fires an event for a finished simulation.
+     *
+     * @param model [Model] for the simulation.
+     */
+    private fun fireSimulationFinishedEvent(model: Model) {
+        this.outputHandlers.forEach { listener -> listener.simulationFinished(model) }
+    }
+
+
+    /**
+     * Adds an listener that handles simulation events (in classical API form).
+     *
+     * @param listener [SimulationEventListener]
+     */
+    fun addSimulationEventListener(listener: ISimulationEventHandler) {
+        val isListenerAlreadyAvailable = this.outputHandlers.contains(listener)
+        if (!isListenerAlreadyAvailable) {
+            this.outputHandlers.add(listener)
+        }
+    }
+
+
+    /**
+     * Removes a [SimulationEventListener].
+     *
+     * @param listener [SimulationEventListener]
+     */
+    fun removeSimulationEventListener(listener: ISimulationEventHandler) {
+        this.outputHandlers.remove(listener)
+    }
+
+
+    /**
+     * Adds an listener that handles simulation events (in form of lambda expression).
+     */
+    fun addSimulationEventListener(
+        listenerAction: Simulation.() -> ISimulationEventHandler
+    ) : Unit {
+        outputHandlers.add(listenerAction(this))
+    }
+
+
+    /**
+     * Adds multiple listeners that handles simulation events (using lambda with receiver).
+     */
+    val outputs = SimulationEventListenersHandler()
+    inner class SimulationEventListenersHandler {
+        fun add(listener: ISimulationEventHandler) {
+            this@Simulation.outputHandlers.add(listener)
+        }
+
+        fun CsvExporter(csvFile: String = "output.csv", separator: String = ";"): CsvExporter {
+            val listener = hr.unipu.ksdtoolkit.outputs.CsvExporter(csvFile, separator)
+            add(listener)
+            return listener
+        }
+
+        fun PngExporter(pngFile: String = "output.png"): PngExporter {
+            PngExporter.simulation = this@Simulation
+            val listener = hr.unipu.ksdtoolkit.outputs.PngExporter(pngFile)
+            add(listener)
+            return listener
+        }
+
+        fun WinSimulator(): WinSimulator {
+            WinSimulator.simulation = this@Simulation
+            val listener = hr.unipu.ksdtoolkit.outputs.WinSimulator()
+            add(listener)
+            return listener
+        }
+
+        operator fun invoke(
+            body: SimulationEventListenersHandler.() -> Unit) {
+            body()
+        }
+    }
+
+
+
+}

ksdtoolkit-core/src/main/resources/Style1.css

@@ -0,0 +1,11 @@
+.chart-series-line{
+    -fx-stroke-width: 1px;
+    -fx-stroke:#eedede;
+    -fx-effect: null;
+}
+.chart-vertical-grid-lines {
+    -fx-stroke: #cccccc;
+}
+.chart-horizontal-grid-lines {
+    -fx-stroke: #cccccc;
+}

ksdtoolkit-core/src/main/resources/Style2.css

@@ -0,0 +1,45 @@
+.chart-plot-background {
+    -fx-border-color: black;
+    -fx-border-width: 4px;
+    /*-fx-border-insets: -2px;*/
+    -fx-background: white;
+}
+
+.axis:top {
+    -fx-border-color: transparent;
+}
+
+.axis:right {
+    -fx-border-color: transparent;
+}
+
+.axis:bottom {
+    -fx-border-color: transparent;
+}
+
+.axis:left {
+    -fx-border-color: transparent;
+}
+
+.chart-vertical-grid-lines {
+    -fx-stroke: transparent;
+}
+
+.chart-horizontal-grid-lines {
+    -fx-stroke: transparent;
+}
+
+.chart-legend {
+    -fx-background-color:  white;
+    -fx-padding: 20px;
+}
+
+/*.chart-major-vertical-grid-lines {*/
+/*    -fx-stroke: #dddddd;*/
+/*    -fx-stroke-width: 1.0;*/
+/*}*/
+
+/*.chart-major-horizontal-grid-lines {*/
+/*    -fx-stroke: #dddddd;*/
+/*    -fx-stroke-width: 1.0;*/
+/*}*/

ksdtoolkit-core/src/main/resources/Style3.css

@@ -0,0 +1,21 @@
+.chart {
+    -fx-padding: 10px;
+    -fx-background: white;
+    /*-fx-background-image: url("icon.png");*/
+}
+.chart-content {
+    -fx-padding: 30px;
+
+}
+.chart-legend {
+    -fx-background-color:  transparent;
+    -fx-padding: 20px;
+}
+
+.chart-legend-item-symbol{
+    -fx-background-radius: 0;
+}
+
+.chart-legend-item{
+    -fx-text-fill: #191970;
+}

ksdtoolkit-core/src/test/kotlin/hr.unipu.ksdtoolkit/1_EntitiesTest.kt

@@ -0,0 +1,141 @@
+package hr.unipu.ksdtoolkit
+
+import hr.unipu.ksdtoolkit.entities.*
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+import hr.unipu.ksdtoolkit.integration.Integration
+import hr.unipu.ksdtoolkit.modules.ModuleGenericCompoundDecrease
+import org.hamcrest.CoreMatchers.`is`
+import org.hamcrest.CoreMatchers.instanceOf
+import org.junit.Assert
+import org.junit.Assert.assertThat
+import org.junit.Before
+import org.junit.Test
+
+/**
+ * Unit testing all entities: Model, Constant, Converter, Flow, Stock, Module.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class `1_EntitiesTest` {
+    val model: Model
+    val CONSTANT: Constant
+    val converter: Converter
+    val flow: Flow
+    val Stock: Stock
+    val Module: ModuleGenericCompoundDecrease
+
+
+    // Prepare model and model entities for testing.
+    init {
+        model = Model()
+
+        model.name = "Model_name"
+        model.initialTime = 0.0
+        model.finalTime = 100.0
+        model.timeStep = 0.25
+        model.integrationType = EulerIntegration()
+
+        CONSTANT = model.constant("CONSTANT_NAME")
+        CONSTANT.equation = { 1.0 }
+
+        converter = model.converter("converter_name")
+        converter.equation = { 2 * 1.0 }
+
+        flow = model.flow("flow_name")
+        flow.equation = { 1 + 1.0 }
+
+        Stock = model.stock("Stock_name")
+        Stock.initialValue = { 0.0 }
+        Stock.equation = { -1.0 }
+
+        Module = model.createModule(
+            "Module",
+            "hr.unipu.ksdtoolkit.modules.ModuleGenericCompoundDecrease"
+        ) as ModuleGenericCompoundDecrease
+    }
+
+
+    @Test fun constantTest() {
+
+        // Testing that constant is created.
+        assertThat(CONSTANT.name, `is`("CONSTANT_NAME"))
+
+        // Testing that constant value is set.
+        assertThat(CONSTANT.equation?.invoke() as Double, `is`(1.0))
+    }
+
+
+    @Test fun converterTest() {
+
+        // Testing that converter is created.
+        assertThat(converter.name, `is`("converter_name"))
+
+        // Testing that converter equation works.
+        assertThat(converter.equation?.invoke() as Double, `is`(2.0))
+    }
+
+
+    @Test fun flowTest() {
+
+        // Testing that flow is created.
+        assertThat(flow.name, `is`("flow_name"))
+
+        // Testing that flow equation works.
+        assertThat(flow.equation?.invoke() as Double, `is`(2.0))
+    }
+
+
+    // Abstract method ModelEntity is tested using implementation of concrete classes.
+    /*
+    @Test fun modelEntityTest() { }
+     */
+
+
+    @Test fun stockTest() {
+
+        // Testing that Stock is created.
+        assertThat(Stock.name, `is`("Stock_name"))
+
+        // Testing Stock initial value works.
+        assertThat(Stock.initialValue?.invoke() as Double, `is`(0.0))
+
+        // Testing Stock equation works.
+        assertThat(Stock.equation?.invoke() as Double, `is`(-1.0))
+    }
+
+
+    @Test fun moduleTest() {
+
+        // Testing that Module is created.
+        assertThat(Module.name, `is`("Module"))
+
+        // Test that all Module entities can be accessed.
+        assertThat(Module.entities.keys, `is`(setOf("CONSTANT", "INITIAL_STOCK", "Stock",
+            "inflow", "outflow", "converter" )))
+
+        // Testing equation in Module works.
+        assertThat(Module.INITIAL_STOCK.equation?.invoke() as Double, `is`(100.0))
+    }
+
+
+    @Test fun modelTest() {
+
+        // Testing that model is created.
+        assertThat(model.name, `is`("Model_name"))
+
+        // Testing that setup works correctly.
+        assertThat(model.initialTime.toDouble(), `is`(0.0))
+        assertThat(model.finalTime.toDouble(), `is`(100.0))
+        assertThat(model.timeStep.toDouble(), `is`(0.25))
+
+        // Testing that setting integration type works correctly.
+        assertThat(model.integrationType, instanceOf(EulerIntegration::class.java))
+
+        // Testing that all entities are in the model.
+        assertThat(model.entities, `is`(hashMapOf("CONSTANT_NAME" to CONSTANT,
+            "converter_name" to converter,
+            "flow_name" to flow,
+            "Stock_name" to Stock)))
+    }
+
+}

ksdtoolkit-core/src/test/kotlin/hr.unipu.ksdtoolkit/2_IntegrationsTest.kt

@@ -0,0 +1,84 @@
+package hr.unipu.ksdtoolkit
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.entities.Stock
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+import hr.unipu.ksdtoolkit.integration.RungeKuttaIntegration
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import org.hamcrest.CoreMatchers.*
+import org.hamcrest.Matchers.closeTo
+import org.junit.Assert.*
+import org.junit.Test
+
+/**
+ * Unit testing numeric integrations: Euler type and RungeKutta type.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class `2_IntegrationsTest` {
+
+    private val model: Model
+    private val Stock: Stock
+    private val simulation: Simulation
+
+    // Prepare model and model entities for testing.
+    init {
+        model = Model()
+        model.initialTime = 0.0
+        model.finalTime = 100.0
+        model.timeStep = 0.25
+
+        Stock = model.stock("Stock_name")
+        Stock.initialValue = { 0.0 }
+        Stock.equation = { -1.0 }
+
+        simulation = Simulation(model)
+    }
+
+
+    @Test fun EulerItegrationTest() {
+
+        model.integrationType = EulerIntegration()
+        simulation.runAllPreparations()
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(-0.25))
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(-0.50))
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(-0.75))
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(-1.00))
+
+    }
+
+
+    @Test fun RugneKuttaIntegrationTest() {
+
+        model.integrationType = RungeKuttaIntegration()
+        simulation.runAllPreparations()
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(closeTo(-0.25, 0.01)))
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(closeTo(-0.50, 0.01)))
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(closeTo(-0.75, 0.01)))
+
+        simulation.runOneTimeStep()
+        assertThat(Stock.currentValue as Double, `is`(closeTo(-1.00, 0.01)))
+    }
+
+
+    // Abstract method Integration is tested using implementation of concrete classes.
+    /*
+    @Test fun ``2_IntegrationsTest``() { }
+     */
+
+}
+

ksdtoolkit-core/src/test/kotlin/hr.unipu.ksdtoolkit/3_ModelsTest.kt

@@ -0,0 +1,162 @@
+package hr.unipu.ksdtoolkit
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.integration.EulerIntegration
+import hr.unipu.ksdtoolkit.models.*
+import org.hamcrest.CoreMatchers.*
+import hr.unipu.ksdtoolkit.entities.*
+import org.hamcrest.Matchers.closeTo
+import org.junit.Assert.*
+import org.junit.Test
+
+/**
+ * Unit testing models:
+ * - GenericSD,
+ * - SimpleCompoundInterest, InheritedCompoundInterest,
+ * - BassDiffusion, InnovationDiffusion,
+ * - TestSpeed model.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class `3_ModelsTest` {
+
+    private val model1: Model
+    private val model2: Model
+    private val model3: Model
+    private val model4: Model
+    private val model5: Model
+    private val model6: Model
+
+    init {
+        model1 = ModelGenericSD()
+        model2 = ModelSimpleCompoundInterest()
+        model3 = ModelInheritedCompoundInterest()
+        model4 = ModelBassDiffusion()
+        model5 = ModelInnovationDiffusion()
+        model6 = ModelTestSpeed()
+    }
+
+
+    @Test
+    fun model1Test() {
+
+        // Testing that model is created.
+        assertThat(model1.name, `is`("Generic SD Model"))
+
+        // Testing that setup works correctly.
+        assertThat(model1.initialTime.toDouble(), `is`(0.0))
+        assertThat(model1.finalTime.toDouble(), `is`(120.0))
+        assertThat(model1.timeStep.toDouble(), `is`(0.25))
+
+        // Testing that setting integration type works correctly.
+        assertThat(model1.integrationType, instanceOf(EulerIntegration::class.java))
+
+        // Testing Stock initial value works.
+        assertThat((model1.entities["Stock"] as Stock)._initialValue?.invoke(), `is`(100.0))
+
+        // Testing that all entities are in the model.
+        assertThat(
+            model1.entities.keys, `is`(
+                hashMapOf(
+                    "CONSTANT" to Constant("CONSTANT"),
+                    "INITIAL_STOCK" to Constant("INITIAL_STOCK"),
+                    "converter" to Converter("converter"),
+                    "inflow" to Flow("inflow"),
+                    "outflow" to Flow("outflow"),
+                    "Stock" to Stock("Stock")
+                ).keys
+            )
+        )
+
+        assertThat(
+            model1.entities.keys, `is`(
+                setOf(
+                    "CONSTANT",
+                    "INITIAL_STOCK",
+                    "converter",
+                    "inflow",
+                    "outflow",
+                    "Stock"
+                )
+            )
+        )
+
+        // Testing equation in model works.
+        assertThat( (((model1.entities["Stock"] as Stock)
+            .initialValue?.invoke() as ModelEntity)
+            .equation?.invoke() as Int).toDouble(), `is`(closeTo(100.0, 0.001)))
+
+        // Testing that Module is created.
+        assertThat(model1.modules["Module"]?.name, `is`("Module"))
+
+        // Test that all Module entities can be accessed.
+        assertThat(model1.modules["Module"]?.entities?.keys, `is`(setOf("CONSTANT", "INITIAL_STOCK", "Stock",
+            "inflow", "outflow", "converter" )))
+
+        // Testing equation in Module works.
+        assertThat( (model1.modules["Module"]?.entities!!["Stock"] as Stock)._initialValue?.invoke(),
+        `is`(100.0))
+
+
+    }
+
+
+
+    @Test
+    fun model2Test() {
+
+        // Testing that model is created.
+        assertThat(model2.name, `is`("Simple Compound Interest Model"))
+
+        // Other assertions are similar to the first test.
+
+    }
+
+
+
+    @Test
+    fun model3Test() {
+
+        // Testing that model is created.
+        assertThat(model3.name, `is`("Inherited Compound Interest Model"))
+
+        // Other assertions are similar to the first test.
+
+    }
+
+
+    @Test
+    fun model4Test() {
+
+        // Testing that model is created.
+        assertThat(model4.name, `is`("Bass Diffusion Model"))
+
+        // Other assertions are similar to the first test.
+
+    }
+
+
+    @Test
+    fun model5Test() {
+
+        // Testing that model is created.
+        assertThat(model5.name, `is`("Innovation/Product Diffusion Model"))
+
+        // Other assertions are similar to the first test.
+
+    }
+
+
+    @Test
+    fun model6Test() {
+
+        // Testing that model is created.
+        assertThat(model6.name, `is`("SD Model for testing speed"))
+
+        // Other assertions are similar to the first test.
+
+    }
+
+
+}
+

ksdtoolkit-core/src/test/kotlin/hr.unipu.ksdtoolkit/4_SimulationRunTest.kt

@@ -0,0 +1,179 @@
+package hr.unipu.ksdtoolkit
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.models.*
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import org.hamcrest.CoreMatchers.*
+import org.hamcrest.Matchers.closeTo
+import org.junit.Assert.*
+import org.junit.Test
+import org.slf4j.LoggerFactory
+import hr.unipu.ksdtoolkit.models.ModelTestSpeed as ModelTestSpeed
+
+
+/**
+ * Unit testing simulation run for all models:
+ * - GenericSD,
+ * - SimpleCompoundInterest, InheritedCompoundInterest,
+ * - BassDiffusion, InnovationDiffusion,
+ * - TestSpeed model.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class `4_SimulationRunTest` {
+
+    private var myModel: Model
+    private val myModel1: Model
+    private val myModel2: Model
+    private val myModel3: Model
+    private val myModel4: Model
+    private val myModel5: Model
+    private val myModel6: Model
+
+    private var mySimulation: Simulation
+    private val mySimulation1: Simulation
+    private val mySimulation2: Simulation
+    private val mySimulation3: Simulation
+    private val mySimulation4: Simulation
+    private val mySimulation5: Simulation
+    private val mySimulation6: Simulation
+
+
+    init {
+        // 1-3. Create the model
+        myModel1 = ModelGenericSD()
+        myModel2 = ModelSimpleCompoundInterest()
+        myModel3 = ModelInheritedCompoundInterest()
+        myModel4 = ModelBassDiffusion()
+        myModel5 = ModelInnovationDiffusion()
+        myModel6 = ModelTestSpeed()
+
+
+        // 4. Create the simulation
+        mySimulation1 = Simulation(myModel1)
+        mySimulation2 = Simulation(myModel2)
+        mySimulation3 = Simulation(myModel3)
+        mySimulation4 = Simulation(myModel4)
+        mySimulation5 = Simulation(myModel5)
+        mySimulation6 = Simulation(myModel6)
+
+
+        // select the model & simulation for the output
+        myModel = myModel1
+        mySimulation = mySimulation1
+
+    }
+
+
+    @Test
+    fun simulation1RunTest() {
+
+        // Testing that model is passed to simulation.
+        assertThat(mySimulation1.model.name, `is`("Generic SD Model"))
+
+
+        // Testing that setup works correctly.
+        assertThat(mySimulation1.model.initialTime.toDouble(), `is`(0.0))
+        assertThat(mySimulation1.model.finalTime.toDouble(), `is`(120.0))
+        assertThat(mySimulation1.model.timeStep.toDouble(), `is`(0.25))
+
+
+        // Testing model & simulation at time=0 (beginning of simulation).
+        LoggerFactory.getLogger(javaClass).info("Running Simulation 0: at final time=0")
+        myModel1.finalTime = 0
+        mySimulation1.run()
+        assertThat(myModel1.entities["INITIAL_STOCK"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["CONSTANT"]?.currentValue, `is`(closeTo(10.0, 0.001)))
+        assertThat(myModel1.entities["converter"]?.currentValue, `is`(closeTo(0.0083, 0.001)))
+        assertThat(myModel1.entities["Stock"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["inflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["outflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.inflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.outflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.Stock"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["Module.converter"]?.currentValue, `is`(closeTo(0.0083, 0.001)))
+        assertThat(myModel1.entities["Module.CONSTANT"]?.currentValue, `is`(closeTo(10.0, 0.001)))
+        assertThat(myModel1.entities["Module.INITIAL_STOCK"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+
+
+        // Testing model & simulation at time=60 (middle of simulation).
+        LoggerFactory.getLogger(javaClass).info("Running Simulation 1: at final time=60")
+        myModel1.finalTime = 60
+        mySimulation1.run()
+        assertThat(myModel1.entities["INITIAL_STOCK"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["CONSTANT"]?.currentValue, `is`(closeTo(10.0, 0.001)))
+        assertThat(myModel1.entities["converter"]?.currentValue, `is`(closeTo(0.0083, 0.001)))
+        assertThat(myModel1.entities["Stock"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["inflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["outflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.inflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.outflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.Stock"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["Module.converter"]?.currentValue, `is`(closeTo(0.0083, 0.001)))
+        assertThat(myModel1.entities["Module.CONSTANT"]?.currentValue, `is`(closeTo(10.0, 0.001)))
+        assertThat(myModel1.entities["Module.INITIAL_STOCK"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+
+
+
+        // Testing model & simulation at time=120 (end of simulation).
+        LoggerFactory.getLogger(javaClass).info("Running Simulation 2: at final time=120")
+        myModel1.finalTime = 120
+        mySimulation1.run()
+        assertThat(myModel1.entities["INITIAL_STOCK"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["CONSTANT"]?.currentValue, `is`(closeTo(10.0, 0.001)))
+        assertThat(myModel1.entities["converter"]?.currentValue, `is`(closeTo(0.0083, 0.001)))
+        assertThat(myModel1.entities["Stock"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["inflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["outflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.inflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.outflow"]?.currentValue, `is`(closeTo(0.8333, 0.001)))
+        assertThat(myModel1.entities["Module.Stock"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+        assertThat(myModel1.entities["Module.converter"]?.currentValue, `is`(closeTo(0.0083, 0.001)))
+        assertThat(myModel1.entities["Module.CONSTANT"]?.currentValue, `is`(closeTo(10.0, 0.001)))
+        assertThat(myModel1.entities["Module.INITIAL_STOCK"]?.currentValue, `is`(closeTo(100.0, 0.001)))
+
+
+    }
+
+
+    @Test
+    fun simulation2RunTest() {
+
+        // Testing that model is passed to simulation
+        assertThat(mySimulation2.model.name, `is`("Simple Compound Interest Model"))
+    }
+
+
+    @Test
+    fun simulation3RunTest() {
+
+        // Testing that model is passed to simulation
+        assertThat(mySimulation3.model.name, `is`("Inherited Compound Interest Model"))
+    }
+
+
+    @Test
+    fun simulation4RunTest() {
+
+        // Testing that model is passed to simulation
+        assertThat(mySimulation4.model.name, `is`("Bass Diffusion Model"))
+    }
+
+
+    @Test
+    fun simulation5RunTest() {
+
+        // Testing that model is passed to simulation
+        assertThat(mySimulation5.model.name, `is`("Innovation/Product Diffusion Model"))
+    }
+
+
+    @Test
+    fun simulation6RunTest() {
+
+        // Testing that model is passed to simulation
+        assertThat(mySimulation6.model.name, `is`("SD Model for testing speed"))
+    }
+
+
+}

ksdtoolkit-core/src/test/kotlin/hr.unipu.ksdtoolkit/5_SimulationOutputsTest.kt

@@ -0,0 +1,141 @@
+package hr.unipu.ksdtoolkit
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.models.*
+import hr.unipu.ksdtoolkit.outputs.*
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import org.junit.Test
+import org.hamcrest.CoreMatchers.*
+import org.hamcrest.Matchers.closeTo
+import org.junit.Assert.*
+import org.slf4j.LoggerFactory
+import java.io.File
+
+/**
+ * Unit testing simulation outputs:
+ * - CsvExporter
+ * - PngExporter
+ * - WinSimulator
+ * - WebSimulator
+ * - MobSimulator
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class `5_SimulationOutputsTest` {
+
+    private var model: Model
+    private var simulation: Simulation
+    private lateinit var csvExporter: CsvExporter       // ISimulationEventHandler needed for tests.
+    private lateinit var pngExporter: PngExporter       // ISimulationEventHandler needed for tests.
+    private lateinit var winSimulator: WinSimulator       // ISimulationEventHandler needed for tests.
+
+    init {
+
+        // 1-3. Create the model
+        model = ModelGenericSD()
+        //model = ModelSimpleCompoundInterest()
+        //model = ModelInheritedCompoundInterest()
+        //model = ModelBassDiffusion()
+        //model = ModelInnovationDiffusion()
+        //model = ModelTestSpeed()
+
+
+        // 4. Create the simulation
+        simulation = Simulation(model)
+
+
+        // 5. Add results handlers
+        simulation.outputs {
+            csvExporter = CsvExporter("output_data.csv", ";")
+            pngExporter = PngExporter("output_chart.png")
+            winSimulator = WinSimulator()
+
+            // !!! Mobile simulator test has to be run from Android Test, because Java modules
+            // cannot depend on Android modules (reverse is ok).
+            //MobSimulator()
+
+            //WebSimulator()
+        }
+
+        // 6. Run the simulation
+        simulation.run()
+
+    }
+
+
+
+    @Test fun csvExporterTest() {
+
+        LoggerFactory.getLogger(javaClass).info("\n---CsvExporterTest---")
+
+        // Testing that sb is created.
+        assertThat(csvExporter.sb, instanceOf(StringBuilder::class.java))
+
+
+        // Testing that sb contains all simulation data keys.
+        val entities = simulation.model.modelEntitiesKeys
+        for (entity in entities) {
+            assertThat(csvExporter.sb.toString(), containsString(entity))
+        }
+
+        // Testing that sb contains all simulation data values.
+        val values = simulation.model.modelEntitiesValues
+        for (value in values) {
+            assertThat(csvExporter.sb.toString(), containsString(value))
+        }
+
+        // Testing that CSV file is saved.
+        assertTrue(File("output_data.csv").exists());
+
+    }
+
+
+
+    @Test fun pngExporterTest() {
+
+        LoggerFactory.getLogger(javaClass).info("\n---PngExporterTest---")
+
+        // Testing that PngExporterApp is initialized.
+        assertThat(PngExporterApp.fileName, `is`("output_chart.png"))
+
+        // Testing that PngExporterApp contains all data series.
+        val entities = simulation.model.modelEntitiesKeys
+        for (entity in entities) {
+            assertThat(PngExporterApp.series.toString(), containsString(entity))
+        }
+
+        // Testing that PngExporterApp contains all simulation data values.
+        val values = simulation.model.modelEntitiesValues
+        for ((index,value) in values.withIndex()) {
+            // Quick & dirty to replace decimal point format from "," to "."
+            assertThat(PngExporterApp.series[index].data[0].yValue.toString().replace(",",".").toDouble(),
+                `is`(closeTo(value.replace(",",".").toDouble(), 0.001)))
+        }
+
+        // Testing that PNG file is saved.
+        assertTrue(File("output_chart.png").exists());
+
+
+    }
+
+    @Test fun winSimulatorTest() {
+        LoggerFactory.getLogger(javaClass).info("\n---WinSimulatorTest---")
+    }
+
+
+/*
+
+    // !!! Mobile simulator test has to be run from Android Test.
+    @Test fun MobSimulatorTest() {
+        LoggerFactory.getLogger(javaClass).info("---MobSimulatorTest---")
+    }
+
+
+    @Test fun WebSimulatorTest() {
+        LoggerFactory.getLogger(javaClass).info("---WebSimulatorTest---")
+    }
+
+ */
+
+
+}

ksdtoolkit-mobapp/build.gradle.kts

@@ -0,0 +1,93 @@
+/**
+ * Subproject: "ksdtoolkit-mobapp".
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+plugins {
+
+    id("com.android.application")
+
+    /**
+     * !!! Problems if "kotlin-android" and "kotlin-android-extensions" are included with plugin "com.android.application"
+     * - SOLUTION: Use full names e.g. "org.jetbrains.kotlin.android.extensions", so that
+     *             pluginManagement in settings.gradle.kts can recognize name.
+     */
+    id("org.jetbrains.kotlin.android")
+
+    id("org.jetbrains.kotlin.android.extensions")
+}
+
+
+android {
+    compileSdkVersion(28)
+    buildToolsVersion("29.0.3")
+    defaultConfig {
+        applicationId = "hr.unipu.mobilesimulatorapp"
+        minSdkVersion(24)
+        targetSdkVersion(28)
+        versionCode = 1
+        versionName = "1.0"
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+    testBuildType = "debug"
+    buildTypes {
+        getByName("debug") {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+        getByName("release") {
+            isMinifyEnabled = true
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+    }
+    compileOptions {
+        setSourceCompatibility(JavaVersion.VERSION_1_8)
+        setTargetCompatibility(JavaVersion.VERSION_1_8)
+    }
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8.toString()
+    }
+}
+
+
+dependencies {
+    implementation(project(path = ":ksdtoolkit-core", configuration = "default"))
+
+    implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar"))))
+
+    api("com.google.android.material:material:1.3.0-alpha04")
+
+    implementation("com.github.PhilJay:MPAndroidChart:v3.1.0")
+
+    implementation("org.jetbrains.kotlin:kotlin-reflect:1.4.20")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.4.20")
+
+    implementation("androidx.core:core-ktx:1.3.2")
+    implementation("androidx.appcompat:appcompat:1.2.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.0.4")
+
+    testImplementation("junit:junit:4.13.1")
+    testImplementation("org.mockito:mockito-core:3.1.0")
+    testImplementation("androidx.test:core:1.3.0")
+
+    androidTestImplementation("androidx.test:core:1.3.0")
+    androidTestImplementation("androidx.test:core-ktx:1.3.0")
+    androidTestImplementation("androidx.test:runner:1.3.0")
+    androidTestImplementation("androidx.test:rules:1.3.0")
+    androidTestImplementation("org.hamcrest:hamcrest-library:1.3")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.3.0")
+    androidTestImplementation("androidx.test.ext:junit:1.1.2")
+    androidTestImplementation("androidx.test.ext:junit-ktx:1.1.2")
+    androidTestImplementation("androidx.test.uiautomator:uiautomator:2.2.0")
+}
+
+
+tasks.register("appStart") {
+    dependsOn(":ksdtoolkit-mobapp:installDebug")
+    doLast {
+        exec {
+            commandLine("cmd", "/c", "adb", "shell", "am", "start", "-n", "hr.unipu.mobilesimulatorapp/.MobSimulatorApp")
+        }
+    }
+}

ksdtoolkit-mobapp/gradle.properties

@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx1536m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app's APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official

ksdtoolkit-mobapp/src/androidTest/java/hr/unipu/mobilesimulatorapp/MobSimulatorInstrumentedTest.kt

@@ -0,0 +1,106 @@
+package hr.unipu.mobilesimulatorapp
+
+import android.app.PendingIntent.getActivity
+import android.content.pm.PackageManager
+import androidx.core.content.ContextCompat.startActivity
+import androidx.test.core.app.ActivityScenario
+import androidx.test.core.app.launchActivity
+import androidx.test.ext.junit.rules.activityScenarioRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.platform.app.InstrumentationRegistry
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.models.ModelGenericSD
+import hr.unipu.ksdtoolkit.models.ModelInnovationDiffusion
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import org.hamcrest.CoreMatchers.*
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.Matchers
+import org.junit.*
+import org.junit.runner.RunWith
+import org.slf4j.LoggerFactory
+
+
+/**
+ * Instrumented test, which will execute on an Android device or emulator.
+ * - These tests have access to Instrumentation APIs, give you access to information such as the Context of the app
+ *   you are testing, and let you control the app under test from your test code.
+ * - The Gradle build interprets these test source sets in the same manner as it does for your project's app source
+ *   sets, which allows you to create tests based on build variants.
+ * - More info: https://developer.android.com/training/testing/unit-testing/instrumented-unit-tests
+ */
+
+@RunWith(AndroidJUnit4::class)      // AndroidJUnit4 as default test runner.
+class MobSimulatorInstrumentedTest {
+
+    @After fun launchApp() {
+        launchActivity<MobSimulatorApp>()
+        Thread.sleep(30000)     // Automatic Testing closes app after tests are finished.
+                                     // Manual testing needs this pause for postponing the app closing.
+    }
+
+    private val model: Model
+    private var simulation: Simulation
+
+    init {
+        // Create generic model.
+        //model = ModelGenericSD()
+        model = ModelInnovationDiffusion()
+
+        // Create the simulation.
+        simulation = Simulation(model)
+
+        // Add results handlers.
+        MobSimulatorApp.simulation = simulation       // Add simulation (and model) objects to app companion.
+        simulation.addSimulationEventListener(MobSimulator())
+
+        // Run the simulation
+        simulation.run()
+    }
+
+
+    /**
+     * Testing that simulation results are accessible from the mobile app.
+     */
+    @Test fun mobSimulatorTest() {
+
+        // Initial test that testing framework is working.
+        // - Testing that context of the app under test is correct.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertThat(appContext.packageName, containsString("hr.unipu.mobilesimulatorapp"))
+
+
+        // Testing that model is accessible from the mobile app.
+        Assert.assertNotNull(model.name)
+        LoggerFactory.getLogger(javaClass).info("\n---modelTest---")
+
+
+        // Testing that simulation is accessible from the mobile app.
+        // - Testing that model is passed to simulation.
+        Assert.assertNotNull(MobSimulatorApp.simulation.model.name)
+        LoggerFactory.getLogger(javaClass).info("\n---simulationTest---")
+
+
+        // Testing that MobSimulatorApp contains all data series.
+        val entities = MobSimulatorApp.simulation.model.modelEntitiesKeys
+        for (entity in entities) {
+            Assert.assertThat(MobSimulatorApp.seriesName.toString(), containsString(entity))
+        }
+        LoggerFactory.getLogger(javaClass).info("---mobSimulatorTest---")
+
+
+        // Testing that MobSimulatorApp contains all simulation data values.
+        val values = simulation.model.modelEntitiesValues
+        for ((index, value) in values.withIndex()) {
+            Assert.assertThat(
+                MobSimulatorApp.seriesValue[index][0].y.toString().replace(",", ".").toDouble(),
+                `is`(Matchers.closeTo(value.replace(",", ".").toDouble(), 0.001))
+            )
+        }
+
+    }
+
+
+
+
+
+}

ksdtoolkit-mobapp/src/main/AndroidManifest.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          xmlns:tools="http://schemas.android.com/tools"
+          package="hr.unipu.mobilesimulatorapp">
+
+    <application
+            android:icon="@mipmap/ic_launcher"
+            android:label="@string/app_name"
+            android:roundIcon="@mipmap/ic_launcher_round"
+            android:theme="@style/Theme.MyApp">
+        <activity android:name=".MobSimulatorApp">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

ksdtoolkit-mobapp/src/main/java/hr/unipu/mobilesimulatorapp/MobSimulator.kt

@@ -0,0 +1,27 @@
+package hr.unipu.mobilesimulatorapp
+
+import hr.unipu.ksdtoolkit.entities.Constant
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.simulations.ISimulationEventHandler
+
+/**
+ * Class that implements the [SimulationEventListener] interface and controls the chart printing on Android.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class MobSimulator : ISimulationEventHandler {
+
+    override fun simulationInitialized(model: Model) {
+        MobSimulatorApp.addConstants(model.entities.filterValues { it is Constant })
+        MobSimulatorApp.addSeriesNames(model.modelEntitiesKeys)
+    }
+
+    override fun timeStepCalculated(model: Model) {
+        MobSimulatorApp.addSeriesValues(model.modelEntitiesValues, model.currentTime)
+    }
+
+    override fun simulationFinished(model: Model) {
+        MobSimulatorApp.simulationFinished = true
+    }
+
+}

ksdtoolkit-mobapp/src/main/java/hr/unipu/mobilesimulatorapp/MobSimulatorApp.kt

@@ -0,0 +1,248 @@
+package hr.unipu.mobilesimulatorapp
+
+import android.annotation.SuppressLint
+import android.content.pm.ActivityInfo
+import android.graphics.Color
+import android.os.Bundle
+import android.text.InputType
+import android.util.TypedValue
+import android.view.View
+import android.view.ViewGroup
+import android.widget.*
+import androidx.appcompat.app.AppCompatActivity
+import com.github.mikephil.charting.charts.LineChart
+import com.github.mikephil.charting.components.YAxis
+import com.github.mikephil.charting.data.Entry
+import com.github.mikephil.charting.data.LineData
+import com.github.mikephil.charting.data.LineDataSet
+import com.github.mikephil.charting.highlight.Highlight
+import com.github.mikephil.charting.interfaces.datasets.ILineDataSet
+import com.github.mikephil.charting.listener.OnChartValueSelectedListener
+import hr.unipu.ksdtoolkit.entities.ModelEntity
+import hr.unipu.ksdtoolkit.models.ModelInnovationDiffusion
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import org.slf4j.LoggerFactory
+
+/**
+ * Android mobile simulator app - for chart plotting and interactive simulation.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class MobSimulatorApp : AppCompatActivity() {
+
+    init {
+
+        /**---Creating: model, simulation and run.---**/
+
+        // 1. Create a demo model.
+        val model = ModelInnovationDiffusion()      // Or other models: ModelGenericSD(), ModelTestSpeed(), etc.
+
+        // 2. Create the simulation.
+        simulation = Simulation(model)
+
+        // 3. Add results handlers
+        simulation.addSimulationEventListener(MobSimulator())
+
+        // 4. Run simulation (so that all expressions are invoked for time=0).
+        simulation.run()
+
+    }
+
+    companion object {
+        public lateinit var simulation: Simulation
+
+        public var simulationFinished: Boolean = false
+        public var seriesName: ArrayList<String> = ArrayList()
+        public var seriesValue: ArrayList<ArrayList<Entry>> = ArrayList()
+        public var constantsName: ArrayList<String> = ArrayList()
+        public var constantsValue: ArrayList<Entry> = ArrayList()
+        public var time: ArrayList<Double> = ArrayList()
+        public val lineDataSets: ArrayList<LineDataSet> = ArrayList()
+
+        fun addSeriesNames(modelEntityNames: List<String>) {
+            seriesName = ArrayList()
+            seriesValue = ArrayList()
+            for (modelEntityName in modelEntityNames) {
+                seriesName.add(modelEntityName)
+                seriesValue.add(ArrayList<Entry>())
+                lineDataSets.add(LineDataSet(null, ""))
+            }
+        }
+
+        fun addSeriesValues(modelEntityValues: List<String>, currentTime: Double) {
+            time.add(currentTime)
+            for (i in 0..modelEntityValues.indices.last) {
+                val valueString = modelEntityValues[i]
+                val value = valueString.toFloat()
+                val entry = Entry(currentTime.toFloat(), value)
+                seriesValue[i].add(entry)
+            }
+        }
+
+        fun addConstants(modelEntityConstants: Map<String, ModelEntity>) {
+            constantsName = ArrayList()
+            constantsValue = ArrayList()
+            for (modelEntityConstant in modelEntityConstants) {
+                constantsName.add(modelEntityConstant.key)
+                val value = modelEntityConstant.value.currentValue.toFloat()
+                val entry = Entry(0f, value)
+                constantsValue.add(entry)
+            }
+        }
+
+    }
+
+
+    @SuppressLint("SourceLockedOrientationActivity")
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        LoggerFactory.getLogger(javaClass).info("---onCreate() invoked.---")
+        
+        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
+
+        drawUI()
+    }
+
+
+    /**
+     * Creating layout programmatically (dynamically).
+     */
+    private fun drawUI() {
+        LoggerFactory.getLogger(javaClass).info("---drawUI() invoked.---")
+
+        val rootLayout =  ScrollView(this)
+        rootLayout.layoutParams = ViewGroup.LayoutParams(
+            ViewGroup.LayoutParams.MATCH_PARENT,
+            ViewGroup.LayoutParams.MATCH_PARENT
+        )
+
+        val linearLayoutHorizontal = LinearLayout(this)
+        val linearLayoutHorizontalParams = LinearLayout.LayoutParams(
+            ViewGroup.LayoutParams.MATCH_PARENT,
+            ViewGroup.LayoutParams.MATCH_PARENT
+        )
+        linearLayoutHorizontal.orientation = LinearLayout.HORIZONTAL
+        rootLayout.addView(linearLayoutHorizontal, linearLayoutHorizontalParams)
+
+        val linearLayoutVertical = LinearLayout(this)
+
+        linearLayoutVertical.id = R.id.insertPoint
+        linearLayoutVertical.layoutParams = LinearLayout.LayoutParams(
+            ViewGroup.LayoutParams.WRAP_CONTENT,
+            ViewGroup.LayoutParams.WRAP_CONTENT
+        )
+        linearLayoutVertical.orientation = LinearLayout.VERTICAL
+        linearLayoutHorizontal.addView(linearLayoutVertical)
+
+        for (s in MobSimulatorApp.constantsName) {
+            val textView = TextView(this)
+            textView.layoutParams = LinearLayout.LayoutParams(
+                ViewGroup.LayoutParams.WRAP_CONTENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT
+            )
+            textView.text = s
+            textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, 10F)
+            linearLayoutVertical.addView(textView)
+
+            val editText = EditText(this)
+            editText.layoutParams = LinearLayout.LayoutParams(
+                ViewGroup.LayoutParams.MATCH_PARENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT
+            )
+            editText.setEms(5)
+            editText.inputType = InputType.TYPE_CLASS_NUMBER
+            val indexOfEntity = simulation.model.modelEntitiesKeys.indexOf(s)
+            editText.setText(simulation.model.modelEntitiesValues[indexOfEntity])
+            editText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 10F)
+            editText.setOnFocusChangeListener(object : View.OnFocusChangeListener {
+                override fun onFocusChange(v: View?, hasFocus: Boolean) {
+                    if (!hasFocus) {
+                        val newValue = editText.text.toString().toDouble()
+                        val modelVariableName = textView.text
+                        simulation.model.entities[modelVariableName]?.equation = { newValue }
+                        refreshUI()
+                    }
+                }
+            })
+            linearLayoutVertical.addView(editText)
+        }
+
+        val lineChart = LineChart(this)
+
+        val myColorsPalette = intArrayOf(
+            Color.rgb(217, 80, 138),
+            Color.rgb(254, 149, 7),
+            Color.rgb(254, 247, 120),
+            Color.rgb(106, 167, 134),
+            Color.rgb(53, 194, 209),
+            Color.rgb(64, 89, 128),
+            Color.rgb(149, 165, 124),
+            Color.rgb(217, 184, 162),
+            Color.rgb(191, 134, 134),
+            Color.rgb(179, 48, 80)
+        )
+        val numberOfColorInPalette = myColorsPalette.size
+
+        for (i in seriesValue.indices) {
+            lineDataSets[i] = LineDataSet(seriesValue[i], seriesName[i])
+            lineDataSets[i].color = myColorsPalette[i.rem(numberOfColorInPalette)]
+            lineDataSets[i].circleHoleColor = myColorsPalette[i.rem(numberOfColorInPalette)]
+            lineDataSets[i].setCircleColor(myColorsPalette[i.rem(numberOfColorInPalette)])
+            lineDataSets[i].setDrawValues(false)
+            lineDataSets[i].setAxisDependency(YAxis.AxisDependency.LEFT)
+        }
+
+        lineChart.data = LineData(lineDataSets as List<ILineDataSet>?)
+
+        lineChart.setOnChartValueSelectedListener(object : OnChartValueSelectedListener {
+            override fun onValueSelected(e: Entry?, h: Highlight?) {
+                fun Float.format(digits: Int) = "%.${digits}f".format(this)
+                val tooltipText = "x=${e?.x?.format(2)}, y=${e?.y?.format(2)}"
+                LoggerFactory.getLogger(javaClass).info("---Value selected: $tooltipText---")
+                Toast.makeText(this@MobSimulatorApp, tooltipText, Toast.LENGTH_SHORT).show()
+            }
+            override fun onNothingSelected() { }
+        })
+
+        lineChart.layoutParams = ViewGroup.LayoutParams(
+
+            ViewGroup.LayoutParams.MATCH_PARENT,
+
+            TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 250F, this.resources.displayMetrics).toInt()
+        )
+        lineChart.id = R.id.lineChart
+        linearLayoutHorizontal.addView(lineChart)
+
+        setContentView(rootLayout);
+    }
+
+
+    private fun runSimulation() {
+        LoggerFactory.getLogger(javaClass).info("---runSimulation() invoked.---")
+
+        if (MobSimulatorApp.simulationFinished == false) {
+            val doesNotContainMobSimulatorListener = simulation.outputHandlers.filterIsInstance(MobSimulator()::class.java).isEmpty()
+            if (doesNotContainMobSimulatorListener) {
+
+                simulation.addSimulationEventListener(MobSimulator())
+            }
+
+            simulation.run()
+        }
+    }
+
+
+    private fun refreshUI() {
+        LoggerFactory.getLogger(javaClass).info("---refreshUI() invoked.---")
+
+        MobSimulatorApp.simulationFinished = false
+        runSimulation()
+
+        drawUI()
+    }
+
+
+}
+
+

ksdtoolkit-mobapp/src/main/java/resources/Style1.css

@@ -0,0 +1,11 @@
+.chart-series-line{
+    -fx-stroke-width: 1px;
+    -fx-stroke:#eedede;
+    -fx-effect: null;
+}
+.chart-vertical-grid-lines {
+    -fx-stroke: #cccccc;
+}
+.chart-horizontal-grid-lines {
+    -fx-stroke: #cccccc;
+}

ksdtoolkit-mobapp/src/main/java/resources/Style2.css

@@ -0,0 +1,45 @@
+.chart-plot-background {
+    -fx-border-color: black;
+    -fx-border-width: 4px;
+    /*-fx-border-insets: -2px;*/
+    -fx-background: white;
+}
+
+.axis:top {
+    -fx-border-color: transparent;
+}
+
+.axis:right {
+    -fx-border-color: transparent;
+}
+
+.axis:bottom {
+    -fx-border-color: transparent;
+}
+
+.axis:left {
+    -fx-border-color: transparent;
+}
+
+.chart-vertical-grid-lines {
+    -fx-stroke: transparent;
+}
+
+.chart-horizontal-grid-lines {
+    -fx-stroke: transparent;
+}
+
+.chart-legend {
+    -fx-background-color:  white;
+    -fx-padding: 20px;
+}
+
+/*.chart-major-vertical-grid-lines {*/
+/*    -fx-stroke: #dddddd;*/
+/*    -fx-stroke-width: 1.0;*/
+/*}*/
+
+/*.chart-major-horizontal-grid-lines {*/
+/*    -fx-stroke: #dddddd;*/
+/*    -fx-stroke-width: 1.0;*/
+/*}*/

ksdtoolkit-mobapp/src/main/java/resources/Style3.css

@@ -0,0 +1,21 @@
+.chart {
+    -fx-padding: 10px;
+    -fx-background: white;
+    /*-fx-background-image: url("icon.png");*/
+}
+.chart-content {
+    -fx-padding: 30px;
+
+}
+.chart-legend {
+    -fx-background-color:  transparent;
+    -fx-padding: 20px;
+}
+
+.chart-legend-item-symbol{
+    -fx-background-radius: 0;
+}
+
+.chart-legend-item{
+    -fx-text-fill: #191970;
+}

ksdtoolkit-mobapp/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

ksdtoolkit-mobapp/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

ksdtoolkit-mobapp/src/main/res/layout/activity_main.xml

@@ -0,0 +1,115 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--<androidx.constraintlayout.widget.ConstraintLayout-->
+<!--    xmlns:android="http://schemas.android.com/apk/res/android"-->
+<!--    xmlns:app="http://schemas.android.com/apk/res-auto"-->
+<!--    xmlns:tools="http://schemas.android.com/tools"-->
+<!--    android:layout_width="match_parent"-->
+<!--    android:layout_height="match_parent"-->
+<!--    tools:context=".MobViewerApp">-->
+
+
+    <LinearLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".MobSimulatorApp"
+        android:orientation="horizontal">
+
+
+    <LinearLayout
+        android:id="@+id/insert_point"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+<!--        <com.google.android.material.textfield.TextInputLayout-->
+<!--            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"-->
+<!--            android:layout_width="125dp"-->
+<!--            android:layout_height="wrap_content"-->
+<!--            android:hint="CONTACT_RATE"-->
+<!--            android:textSize="10sp">-->
+
+<!--            <com.google.android.material.textfield.TextInputEditText-->
+<!--                android:layout_width="match_parent"-->
+<!--                android:layout_height="wrap_content"-->
+<!--                android:text="0.01"-->
+<!--                android:textSize="10sp"/>-->
+<!--        </com.google.android.material.textfield.TextInputLayout>-->
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="CONTACT_RATE"
+            android:textSize="10sp"></TextView>
+        <EditText
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ems="5"
+            android:inputType="textPersonName"
+            android:text="100"
+            android:textSize="10sp"/>
+
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="ADVERTISING_EFFECTIVENESS"
+            android:textSize="10sp"></TextView>
+        <EditText
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ems="5"
+            android:inputType="textPersonName"
+            android:text="0.011"
+            android:textSize="10sp"/>
+
+
+        <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="TOTAL_POPULATION"
+        android:textSize="10sp"></TextView>
+        <EditText
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ems="5"
+            android:inputType="textPersonName"
+            android:text="10000"
+            android:textSize="10sp"/>
+
+
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="ADOPTION_FRACTION"
+            android:textSize="10sp"></TextView>
+        <EditText
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ems="5"
+            android:inputType="textPersonName"
+            android:text="0.015"
+            android:textSize="10sp"/>
+
+
+    </LinearLayout>
+
+        <com.github.mikephil.charting.charts.LineChart
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:id="@+id/line_chart" />
+
+    </LinearLayout>
+
+    <!--    <TextView-->
+    <!--        android:layout_width="wrap_content"-->
+    <!--        android:layout_height="wrap_content"-->
+    <!--        android:text="Hello World!"-->
+    <!--        app:layout_constraintBottom_toBottomOf="parent"-->
+    <!--        app:layout_constraintLeft_toLeftOf="parent"-->
+    <!--        app:layout_constraintRight_toRightOf="parent"-->
+    <!--        app:layout_constraintTop_toTopOf="parent" />-->
+
+<!--</androidx.constraintlayout.widget.ConstraintLayout>-->

ksdtoolkit-mobapp/src/main/res/layout/my_view.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--<androidx.constraintlayout.widget.ConstraintLayout-->
+<!--    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"-->
+<!--    android:layout_height="match_parent">-->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MobSimulatorApp"
+    android:orientation="vertical">
+
+    <TextView
+        android:id="@+id/constantName"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="CONSTANT"
+        android:textSize="10sp">
+    </TextView>
+
+    <EditText
+        android:id="@+id/constantValue"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:ems="5"
+        android:inputType="textPersonName"
+        android:text="0.0"
+        android:textSize="10sp"/>
+</LinearLayout>
+
+
+
+    <!--    <com.google.android.material.textfield.TextInputLayout-->
+    <!--        xmlns:android="http://schemas.android.com/apk/res/android"-->
+    <!--        xmlns:tools="http://schemas.android.com/tools"-->
+    <!--        android:layout_width="125dp"-->
+    <!--        android:layout_height="wrap_content"-->
+    <!--        android:id="@+id/textInputLayout"-->
+    <!--        android:textSize="6sp"-->
+    <!--        tools:ignore="MissingConstraints">-->
+
+    <!--        <com.google.android.material.textfield.TextInputEditText-->
+    <!--            android:layout_width="match_parent"-->
+    <!--            android:layout_height="wrap_content"-->
+    <!--            android:textSize="12sp"-->
+    <!--            android:id="@+id/textInputEditText" />-->
+    <!--    </com.google.android.material.textfield.TextInputLayout>-->
+
+    <!--</androidx.constraintlayout.widget.ConstraintLayout>-->

ksdtoolkit-mobapp/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

ksdtoolkit-mobapp/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

ksdtoolkit-mobapp/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#6200EE</color>
+    <color name="colorPrimaryDark">#3700B3</color>
+    <color name="colorAccent">#03DAC5</color>
+</resources>

ksdtoolkit-mobapp/src/main/res/values/dimens.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <dimen name="activity_horizontal_margin">5px</dimen>
+    <dimen name="activity_vertical_margin">5px</dimen>
+</resources>

ksdtoolkit-mobapp/src/main/res/values/ids.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <item type="id" name="insertPoint"/>
+    <item type="id" name="lineChart"/>
+</resources>

ksdtoolkit-mobapp/src/main/res/values/strings.xml

@@ -0,0 +1,4 @@
+<resources>
+    <string name="app_name">MobSimulator</string>
+    <string name="input">input</string>
+</resources>

ksdtoolkit-mobapp/src/main/res/values/styles.xml

@@ -0,0 +1,36 @@
+<resources>
+
+    <!-- Base application theme. -->
+
+<!--    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">-->
+<!--        &lt;!&ndash; Customize your theme here. &ndash;&gt;-->
+<!--        <item name="colorPrimary">@color/colorPrimary</item>-->
+<!--        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>-->
+<!--        <item name="colorAccent">@color/colorAccent</item>-->
+<!--    </style>-->
+
+    <style name="Theme.MyApp" parent="Theme.MaterialComponents.Light">
+
+        <item name="textAppearanceHeadline1">@style/TextAppearance.MaterialComponents.Headline1</item>
+        <item name="textAppearanceHeadline2">@style/TextAppearance.MaterialComponents.Headline2</item>
+        <item name="textAppearanceHeadline3">@style/TextAppearance.MaterialComponents.Headline3</item>
+        <item name="textAppearanceHeadline4">@style/TextAppearance.MaterialComponents.Headline4</item>
+        <item name="textAppearanceHeadline5">@style/TextAppearance.MaterialComponents.Headline5</item>
+        <item name="textAppearanceHeadline6">@style/TextAppearance.MaterialComponents.Headline6</item>
+        <item name="textAppearanceSubtitle1">@style/TextAppearance.MaterialComponents.Subtitle1</item>
+        <item name="textAppearanceSubtitle2">@style/TextAppearance.MaterialComponents.Subtitle2</item>
+        <item name="textAppearanceBody1">@style/TextAppearance.MaterialComponents.Body1</item>
+        <item name="textAppearanceBody2">@style/TextAppearance.MaterialComponents.Body2</item>
+        <item name="textAppearanceCaption">@style/TextAppearance.MaterialComponents.Caption</item>
+        <item name="textAppearanceButton">@style/TextAppearance.MaterialComponents.Button</item>
+        <item name="textAppearanceOverline">@style/TextAppearance.MaterialComponents.Overline</item>
+    </style>
+
+    <style name="TextAppearence.App.TextInputLayout" parent="@android:style/TextAppearance">
+        <item name="android:textSize">6sp</item>
+    </style>
+
+
+
+
+</resources>

ksdtoolkit-mobapp/src/test/java/hr/unipu/mobilesimulatorapp/MobSimulatorLocalUnitTest.kt

@@ -0,0 +1,60 @@
+package hr.unipu.mobilesimulatorapp
+
+
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.models.*
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import org.hamcrest.CoreMatchers
+import org.junit.Test
+
+import org.junit.Assert.*
+import org.slf4j.LoggerFactory
+
+/**
+ * Local unit test, which will execute on local JVM.
+ * - Use these tests to minimize execution time when your tests have no Android framework dependencies or
+ *   when you can mock the Android framework dependencies.
+ * - More info: https://developer.android.com/training/testing/unit-testing/local-unit-tests
+ */
+class MobSimulatorLocalUnitTest {
+
+    private val model: Model
+    private var simulation: Simulation
+
+    init {
+        // Create generic model.
+        model = ModelGenericSD()
+
+        // Create the simulation.
+        simulation = Simulation(model)
+
+        // Add results handlers.
+        MobSimulatorApp.simulation = simulation       // Add simulation (and model) objects to app companion.
+        simulation.addSimulationEventListener(MobSimulator())
+
+        // Run the simulation
+        //simulation.run()
+    }
+
+
+
+    // Testing that model is accessible from mobile app.
+    @Test fun modelTest() {
+
+        LoggerFactory.getLogger(javaClass).info("\n---modelTest---")
+
+        // Testing that model is created.
+        assertThat(MobSimulatorApp.simulation.model.name, CoreMatchers.`is`("Generic SD Model"))
+    }
+
+
+    // Testing that simulation is accessible from mobile app.
+    @Test fun simulationTest() {
+
+        LoggerFactory.getLogger(javaClass).info("\n---simulationTest---")
+
+        // Testing that model is passed to simulation.
+        assertThat(MobSimulatorApp.simulation.model.name, CoreMatchers.`is`("Generic SD Model"))
+    }
+
+}

ksdtoolkit-webapp/build.gradle.kts

@@ -0,0 +1,160 @@
+/**
+ * Subproject: "ksdtoolkit-webapp".
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+import org.gradle.api.tasks.testing.logging.TestExceptionFormat
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+
+plugins {
+    id("org.jetbrains.kotlin.jvm")
+
+    id("org.gretty") version "3.0.3"
+
+    id("com.devsoap.plugin.vaadin") version "2.0.0.beta2"
+}
+
+defaultTasks("clean", "build")
+
+repositories {
+    mavenCentral()
+    jcenter()
+    maven(url = "http://maven.vaadin.com/vaadin-addons" )   // vaadin-addons
+}
+
+
+tasks.withType<KotlinCompile>().all {
+    kotlinOptions.jvmTarget = "1.8"
+}
+
+vaadin {
+    version = "8.5.2"
+}
+
+gretty {
+    contextPath = "/"
+    servletContainer = "jetty9.4"
+}
+
+tasks.withType<Test> {
+    useJUnitPlatform()
+    testLogging {
+
+        exceptionFormat = TestExceptionFormat.FULL
+    }
+}
+
+val staging by configurations.creating
+
+dependencies {
+    implementation(project(path = ":ksdtoolkit-core", configuration = "default"))
+
+    implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar"))))
+
+    implementation("org.apache.poi:poi:3.15")
+
+    implementation("com.github.mvysny.karibudsl:karibu-dsl-v8:1.0.3")
+
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+
+    implementation("org.jetbrains.kotlin:kotlin-reflect")
+
+    implementation("org.slf4j:slf4j-simple:1.7.30")
+
+    implementation("org.slf4j:jul-to-slf4j:1.7.30")
+
+    testImplementation("com.github.mvysny.kaributesting:karibu-testing-v8:1.2.6")
+    testImplementation("com.github.mvysny.dynatest:dynatest-engine:0.19")
+
+    implementation("com.vaadin:vaadin-themes:${vaadin.version}")
+    implementation("com.vaadin:vaadin-client-compiled:${vaadin.version}")
+
+    implementation("com.vaadin:vaadin-push:${vaadin.version}")
+    implementation("com.vaadin:vaadin-server:${vaadin.version}")
+    implementation("javax.servlet:javax.servlet-api:4.0.1")
+
+    implementation("com.vaadin:vaadin-charts:4.0.5")
+    implementation("com.vaadin:vaadin-spreadsheet:2.0.1")
+
+    implementation("org.vaadin.addons:dcharts-widget:1.7.0")
+
+    runtimeOnly("com.google.gwt:gwt-servlet:2.8.2")
+
+    staging("com.heroku:webapp-runner-main:9.0.36.1")
+}
+
+
+tasks {
+    val copyToLib by registering(Copy::class) {
+        into("$buildDir/server")
+        from(staging) {
+            include("webapp-runner*")
+        }
+    }
+    val stage by registering {
+        dependsOn("build", copyToLib)
+    }
+}
+
+tasks.withType<Jar> {
+    enabled = true
+}
+
+tasks.withType<com.devsoap.plugin.tasks.CompileWidgetsetTask> {
+    doFirst {
+        setJvmArgs("-Dvaadin.spreadsheet.developer.license=\${.vaadin.charts.developer.license}",
+            "-Dvaadin.charts.developer.license=\${.vaadin.spreadsheet.developer.license}")
+    }
+}
+
+val compileKotlin: KotlinCompile by tasks
+compileKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+
+val compileTestKotlin: KotlinCompile by tasks
+compileTestKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/**
+ * How to add breakpoint for debugging in Gradle+gretty?
+ * - Start the gretty plug-in, appStartDebug, run directly (normal mode), without debugging.
+ * - Set up remote debugging. Add Remote, click on configuration.
+ *   The configuration port is synchronized with the project gretty configuration: debugPort=5005
+ *   Select the corresponding module.
+ * - Perform debugging.
+ *   Start the web project first (in Normal mode), then start the remote just configured (in Debug mode),
+ *   and then complete gretty remote debugging.
+ * - Project can be started from Terminal as well:
+ *   e.g. gradlew tasks -Dorg.gradle.debug=true --no-daemon
+ * - To stop all Gradle daemons:
+ *   e.g. gradlew --stop
+ * - Run 'gradle appStop' to stop the server.
+ */
+
+gretty {
+    jvmArgs = mutableListOf("-Xmx1024m", "-XX:MaxPermSize=512m")
+    servletContainer = "jetty9.4"
+    contextPath = "/"
+    scanInterval = 0
+    inplaceMode = "hard"
+    debugPort = 5005
+    debugSuspend = true
+}

ksdtoolkit-webapp/gradle.properties

@@ -0,0 +1,4 @@
+vaadin.charts.developer.license=c0171602-2326-457a-837d-226c949709f1
+vaadin.spreadsheet.developer.license=8bf94b9d-b891-47b0-bad3-971445a274a5
+systemProp.vaadin.charts.developer.license=c0171602-2326-457a-837d-226c949709f1
+systemProp.vaadin.spreadsheet.developer.license=8bf94b9d-b891-47b0-bad3-971445a274a5

ksdtoolkit-webapp/src/main/kotlin/hr/unipu/websimulatorapp/WebSimulator.kt

@@ -0,0 +1,28 @@
+package hr.unipu.websimulatorapp
+
+import hr.unipu.ksdtoolkit.entities.Constant
+import hr.unipu.ksdtoolkit.entities.Model
+import hr.unipu.ksdtoolkit.simulations.ISimulationEventHandler
+import hr.unipu.websimulatorapp.webapp.WebSimulatorApp
+
+/**
+ * Class that implements the [SimulationEventListener] interface and controls the chart printing on web.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+class WebSimulator : ISimulationEventHandler {
+
+    override fun simulationInitialized(model: Model) {
+        WebSimulatorApp.addConstants(model.entities.filterValues { it is Constant })
+        WebSimulatorApp.addSeriesNames(model.modelEntitiesKeys)
+
+    }
+
+    override fun timeStepCalculated(model: Model) {
+        WebSimulatorApp.addSeriesValues(model.modelEntitiesValues, model.currentTime)
+    }
+
+    override fun simulationFinished(model: Model) {
+        WebSimulatorApp.simulationFinished = true
+    }
+}

ksdtoolkit-webapp/src/main/kotlin/hr/unipu/websimulatorapp/webapp/CustomLabelTextField.kt

@@ -0,0 +1,50 @@
+package hr.unipu.websimulatorapp.webapp
+
+import com.vaadin.ui.*
+import com.vaadin.ui.themes.ValoTheme
+
+class CustomLabelTextField : CustomField<String>() {
+    val textField = TextField()
+    private val labelText = Label()
+    var modelVariableName = ""
+
+    override fun initContent(): Component {
+
+        labelText.styleName = ValoTheme.LABEL_SMALL
+        labelText.setWidth("200px")
+
+        textField.styleName = ValoTheme.TEXTFIELD_SMALL
+        textField.setWidth("100px")
+
+
+        val myLayout = HorizontalLayout()
+        myLayout.addComponents(labelText)
+        myLayout.addComponent(textField)
+        myLayout.setComponentAlignment(labelText, Alignment.MIDDLE_LEFT)
+        myLayout.setComponentAlignment(textField, Alignment.MIDDLE_RIGHT)
+        myLayout.styleName = ValoTheme.LAYOUT_COMPONENT_GROUP
+
+        return myLayout
+    }
+
+    override fun getValue(): String {
+        return textField.value
+    }
+
+    override fun setValue(value: String) {
+        this.textField.value = value
+    }
+
+    override fun getCaption(): String {
+        return labelText.caption
+    }
+
+    override fun setCaption(caption: String) {
+        this.labelText.caption = caption
+    }
+
+    override fun doSetValue(s: String) {
+
+    }
+
+}

ksdtoolkit-webapp/src/main/kotlin/hr/unipu/websimulatorapp/webapp/CustomSliderLabel.kt

@@ -0,0 +1,72 @@
+package hr.unipu.websimulatorapp.webapp
+
+import com.vaadin.server.Sizeable
+import com.vaadin.ui.*
+import com.vaadin.ui.themes.ValoTheme
+
+class CustomSliderLabel : CustomField<String>() {
+    private val sliderCaption = Label()
+    val slider = Slider()
+    private val sliderValue = Label()
+    var modelVariableName = ""
+
+    override fun initContent(): Component {
+
+        sliderCaption.styleName = ValoTheme.LABEL_SMALL
+        sliderCaption.setWidth("200px")
+
+        slider.styleName = ValoTheme.TEXTFIELD_SMALL
+        slider.setWidth(100f, Sizeable.Unit.PERCENTAGE)
+
+        sliderValue.styleName = ValoTheme.LABEL_SMALL
+        sliderValue.setWidth("100px")
+
+        val myLayout = HorizontalLayout()
+        myLayout.addComponent(sliderCaption)
+        myLayout.addComponent(slider)
+        myLayout.addComponent(sliderValue)
+        myLayout.setComponentAlignment(sliderCaption, Alignment.MIDDLE_LEFT)
+        myLayout.setComponentAlignment(slider, Alignment.MIDDLE_LEFT)
+        myLayout.setComponentAlignment(sliderValue, Alignment.MIDDLE_RIGHT)
+        myLayout.styleName = ValoTheme.LAYOUT_COMPONENT_GROUP
+
+        return myLayout
+    }
+
+    override fun getValue(): String {
+        return sliderValue.value
+    }
+
+    override fun setValue(value: String) {
+        this.sliderValue.value = value
+    }
+
+    fun setValue(value: Double?) {
+        this.slider.value = value!!
+    }
+
+    override fun getCaption(): String {
+        return sliderCaption.value
+    }
+
+    override fun setCaption(value: String) {
+        this.sliderCaption.value = value
+    }
+
+    override fun doSetValue(s: String) {
+
+    }
+
+    fun setResolution(resolution: Int) {
+        this.slider.resolution = resolution
+    }
+
+    fun setMin(resolution: Double) {
+        this.slider.min = resolution
+    }
+
+    fun setMax(resolution: Double) {
+        this.slider.max = resolution
+    }
+
+}

ksdtoolkit-webapp/src/main/kotlin/hr/unipu/websimulatorapp/webapp/CustomTextFieldButton.kt

@@ -0,0 +1,41 @@
+package hr.unipu.websimulatorapp.webapp
+
+import com.vaadin.server.FontAwesome
+import com.vaadin.server.Sizeable
+import com.vaadin.ui.*
+import com.vaadin.ui.themes.ValoTheme
+
+class CustomTextFieldButton : CustomField<String>() {
+    private val textField = TextField()
+
+    override fun initContent(): Component {
+
+        textField.setWidth(100f, Sizeable.Unit.PERCENTAGE)
+        textField.styleName = ValoTheme.TEXTFIELD_SMALL
+        textField.styleName = ValoTheme.TEXTFIELD_BORDERLESS
+        textField.isReadOnly = true
+
+        val button = Button()
+        button.addStyleName(ValoTheme.BUTTON_ICON_ONLY)
+        button.icon = FontAwesome.USER
+
+        val myLayout = CssLayout()
+        myLayout.addComponents(textField, button)
+        myLayout.styleName = ValoTheme.LAYOUT_COMPONENT_GROUP
+        return myLayout
+    }
+
+    override fun getValue(): String {
+        return textField.value
+    }
+
+    override fun setValue(value: String) {
+        this.textField.value = value
+    }
+
+    override fun doSetValue(s: String) {
+
+    }
+
+
+}

ksdtoolkit-webapp/src/main/kotlin/hr/unipu/websimulatorapp/webapp/CustomWindowSettings.kt

@@ -0,0 +1,39 @@
+package hr.unipu.websimulatorapp.webapp
+
+import com.vaadin.server.Sizeable
+import com.vaadin.ui.FormLayout
+import com.vaadin.ui.TextField
+import com.vaadin.ui.Window
+
+
+class CustomWindowSettings @JvmOverloads constructor(caption: String = "Simulation Settings") : Window(caption) {
+
+    init {
+        this.setWidth(400.0f, Sizeable.Unit.PIXELS)
+
+        val form = FormLayout()
+
+        val tf1 = TextField("Initial time:")
+        tf1.value = WebSimulatorApp.simulation.model.initialTime.toString()
+        tf1.addValueChangeListener { valueChangeEvent -> WebSimulatorApp.simulation.model.initialTime = java.lang.Double.parseDouble(valueChangeEvent.value) }
+        form.addComponent(tf1)
+
+        val tf2 = TextField("Final time:")
+        tf2.value = WebSimulatorApp.simulation.model.finalTime.toString()
+        tf2.addValueChangeListener { valueChangeEvent -> WebSimulatorApp.simulation.model.finalTime = java.lang.Double.parseDouble(valueChangeEvent.value) }
+        form.addComponent(tf2)
+
+        val tf3 = TextField("Time step:")
+        tf3.value = WebSimulatorApp.simulation.model.timeStep.toString()
+        tf3.addValueChangeListener { valueChangeEvent -> WebSimulatorApp.simulation.model.timeStep = java.lang.Double.parseDouble(valueChangeEvent.value) }
+        form.addComponent(tf3)
+
+
+        this.addCloseListener { closeEvent ->
+            WebSimulatorApp.simulationFinished == false
+        }
+
+        form.setMargin(true)
+        this.content = form
+    }
+}

ksdtoolkit-webapp/src/main/kotlin/hr/unipu/websimulatorapp/webapp/WebSimulatorApp.kt

@@ -0,0 +1,568 @@
+package hr.unipu.websimulatorapp.webapp
+
+
+import com.vaadin.addon.charts.Chart
+import com.vaadin.addon.charts.model.*
+import com.vaadin.addon.spreadsheet.Spreadsheet
+import com.vaadin.annotations.PreserveOnRefresh
+import com.vaadin.annotations.Theme
+import com.vaadin.annotations.VaadinServletConfiguration
+import com.vaadin.external.org.slf4j.LoggerFactory
+import com.vaadin.server.*
+import com.vaadin.shared.ui.ValueChangeMode
+import com.vaadin.ui.*
+import com.vaadin.ui.Label
+import com.vaadin.ui.themes.ValoTheme
+import hr.unipu.ksdtoolkit.entities.ModelEntity
+import hr.unipu.ksdtoolkit.models.*
+import hr.unipu.ksdtoolkit.simulations.Simulation
+import hr.unipu.websimulatorapp.WebSimulator
+import org.apache.poi.ss.usermodel.Cell
+import java.text.ParseException
+import java.util.*
+import java.util.logging.Level
+import java.util.logging.Logger
+import javax.servlet.annotation.WebServlet
+
+/**
+ * Vaadin web simulator app - for chart plotting and interactive simulation.
+ *
+ * @author [Siniša Sovilj](mailto:sinisa.sovilj@unipu.hr)
+ */
+
+
+@Theme("mytheme") 
+@PreserveOnRefresh 
+class WebSimulatorApp : UI() {
+
+    init {
+
+        LoggerFactory.getLogger(javaClass).info("---WebSimulatorApp init invoked.---")
+
+        /**---Creating: model, simulation and run.---**/
+
+        // 1. Create a model.
+        val model = ModelInnovationDiffusion()
+        //val model = ModelGenericSD()
+        //val model = ModelSimpleCompoundInterest()
+        //val model = ModelInheritedCompoundInterest()
+        //val model = ModelBassDiffusion()
+        //val model = ModelTestSpeed()
+
+        // 2. Create the simulation.
+        simulation = Simulation(model)
+
+        // 3. Add results handlers
+        simulation.addSimulationEventListener(WebSimulator())
+
+        // 4. Run simulation (so that all expressions are invoked for time=0).
+        simulation.run()
+
+    }
+
+
+    /**
+     * Class member variables.
+     */
+    private var timeUnit = simulation.model.timeUnit
+
+
+    /**
+     * Static variables and methods.
+     */
+    companion object {
+
+        private val LAYOUT_WIDTH_COLUMN1 = "450px"
+        private val LAYOUT_WIDTH_COLUMN2 = "450px"
+        private val LAYOUT_WIDTH_COLUMN3 = "600px"
+        private val CHART_WIDTH: String = "450px"
+        private val CHART_HEIGHT: String = "350px"
+        private val DATA_IN_ROWS = true
+
+        private var seriesNames: ArrayList<String> = ArrayList()
+        private var seriesUnits: ArrayList<String> = ArrayList()
+        private var seriesValues: ArrayList<ListSeries> = ArrayList()
+        private var time: ArrayList<Double> = ArrayList()
+        private var constantsName: ArrayList<String> = ArrayList()
+        private var constantsValue: ArrayList<DataSeriesItem> = ArrayList()
+
+        public lateinit var simulation: Simulation
+        public var simulationFinished: Boolean = false
+
+
+        /**
+         * Add series names to web simulator (for chart series).
+         *
+         * @param modelEntityNames list of model entity names.
+         */
+        fun addSeriesNames(modelEntityNames: List<String>) {
+
+            LoggerFactory.getLogger(javaClass).info("---SeriesNames added.---")
+
+            seriesNames = ArrayList()
+            seriesValues = ArrayList()
+            seriesUnits = ArrayList()
+            time = ArrayList()
+            val modelEntityUnits = simulation.model.modelEntitiesUnits
+            for (modelEntityName in modelEntityNames) {
+                val index = modelEntityNames.indexOf(modelEntityName)
+                val modelEntityUnit = modelEntityUnits[index]
+                seriesNames.add(modelEntityName)
+                seriesUnits.add(modelEntityUnit)
+                val series = ListSeries()
+                series.name = modelEntityName
+                seriesValues.add(series)
+            }
+        }
+
+
+        /**
+         * Add constants to web simulator.
+         *
+         * @param modelEntityConstants list of model constants.
+         */
+        fun addConstants(modelEntityConstants: Map<String, ModelEntity>) {
+
+            constantsName = ArrayList()
+            constantsValue = ArrayList()
+
+            for (modelEntityConstant in modelEntityConstants) {
+                constantsName.add(modelEntityConstant.key)
+                val value = modelEntityConstant.value.currentValue
+                val item = DataSeriesItem(0, value)
+                constantsValue.add(item)
+            }
+        }
+
+
+        /**
+         * Add series values to web simulator (for chart series).
+         *
+         * @param modelEntityValues list of myModel entity values.
+         * @param currentTime       current myModel time.
+         */
+        fun addSeriesValues(modelEntityValues: List<String>, currentTime: Double) {
+            time.add(currentTime)
+            for (i in 0..modelEntityValues.indices.last) {
+                val valueString = modelEntityValues[i]
+                try {
+                    val value = valueString.toDouble()
+                    seriesValues[i].addData(value)
+                } catch (exception: ParseException) {
+                    Logger.getLogger(WebSimulatorApp::class.java.name).log(
+                        Level.SEVERE, "Parsing entity values from model unsuccessful.", exception)
+                }
+
+            }
+        }
+    }
+
+
+    /**
+     * Vaadin Servlet.
+     */
+    @WebServlet(urlPatterns = ["/*"], name = "MyUIServlet", asyncSupported = true)
+    @VaadinServletConfiguration(ui = WebSimulatorApp::class, productionMode = false)
+    class MyUIServlet : VaadinServlet()
+
+
+    /**
+     * Vaadin init() method - entry point in the web application.
+     */
+    override fun init(vaadinRequest: VaadinRequest) {
+
+        LoggerFactory.getLogger(javaClass).info("---Vaadin 'init' method invoked.---")
+
+        runSimulation()
+
+        drawUI()
+
+    }
+
+
+    /**
+     * Draw UI - for drawing and re-drawing.
+     */
+    private fun drawUI() {
+
+        LoggerFactory.getLogger(javaClass).info("---'draw' method invoked.---")
+
+        val contentVertical = VerticalLayout()
+        val contentHorizontal = HorizontalLayout()
+        val layoutGrid = GridLayout(3, 2)
+
+        val header = Label("WebSimulator: ${simulation.model.name}")
+        header.styleName = ValoTheme.LABEL_H2
+        contentVertical.addComponent(header)
+        contentVertical.setComponentAlignment(header, Alignment.TOP_CENTER)
+        contentVertical.addComponent(layoutGrid)
+        contentHorizontal.addComponent(contentVertical)
+        content = contentHorizontal
+
+
+        val layoutInput = createInputSection()
+        layoutGrid.addComponent(layoutInput, 0, 0)
+
+        val layoutModel = createBackendSection()
+        layoutGrid.addComponent(layoutModel, 1, 0)
+
+        val layoutOutput1 = createChartSection()
+        layoutGrid.addComponent(layoutOutput1, 2, 0)
+
+        val layoutControl = createControlSection()
+        layoutGrid.addComponent(layoutControl, 0, 1)
+
+        var layoutOutput2 = VerticalLayout()
+
+        if (false) layoutOutput2 = createGridSection()
+        if (true) layoutOutput2 = createSpreadsheetSection()
+
+        layoutGrid.addComponent(layoutOutput2, 2, 1)
+    }
+
+
+    private fun runSimulation() {
+
+        if (WebSimulatorApp.simulationFinished == false) {
+            val doesNotContainWebSimulatorListener = simulation.outputHandlers.filterIsInstance(WebSimulator::class.java).isEmpty()
+            if (doesNotContainWebSimulatorListener) {
+
+                simulation.addSimulationEventListener(WebSimulator())
+            }
+            LoggerFactory.getLogger(javaClass).info("---Simulation (re)-run()---")
+            simulation.run()
+        }
+    }
+
+
+    /**
+     * Re-run simulation & refresh UI.
+     */
+    private fun refreshUI() {
+        WebSimulatorApp.simulationFinished = false
+        runSimulation()
+        drawUI()
+    }
+
+
+    /**
+     * Create Input section.
+     */
+    private fun createInputSection(): VerticalLayout {
+        val layoutInput = VerticalLayout()
+        layoutInput.setWidth(LAYOUT_WIDTH_COLUMN1)
+
+        val lblInput = Label("INPUT (parameters):")
+        lblInput.setHeight("24px")
+        lblInput.styleName = ValoTheme.LABEL_COLORED
+        layoutInput.addComponent(lblInput)
+
+        for (s in WebSimulatorApp.constantsName) {
+
+            val labelTextField = CustomLabelTextField()
+            labelTextField.caption = s
+            val indexOfEntity = simulation.model.modelEntitiesKeys.indexOf(s)
+            labelTextField.value = simulation.model.modelEntitiesValues[indexOfEntity]
+            labelTextField.modelVariableName = simulation.model.modelEntitiesKeys[indexOfEntity]
+            labelTextField.textField.valueChangeMode =
+                ValueChangeMode.LAZY
+            labelTextField.textField.valueChangeTimeout = 1600
+            labelTextField.textField.addValueChangeListener { valueChangeEvent ->
+
+                LoggerFactory.getLogger(javaClass).info("Value changed in: $valueChangeEvent")
+
+                val newValue = valueChangeEvent.value.toDouble()
+                Notification.show("Value changed:", newValue.toString(), Notification.Type.TRAY_NOTIFICATION);
+
+                val modelVariableName = labelTextField.modelVariableName
+                simulation.model.entities[modelVariableName]?.equation = { newValue }
+                refreshUI()
+            }
+            layoutInput.addComponent(labelTextField)
+        }
+
+        return layoutInput
+    }
+
+
+    /**
+     * Create Control section.
+     */
+    private fun createControlSection(): VerticalLayout {
+        val layoutControl = VerticalLayout()
+
+        val lblControl = Label("CONTROL (simulation):")
+        lblControl.setHeight("24px")
+        lblControl.styleName = ValoTheme.LABEL_COLORED
+
+        val buttonControl = Button("Simulation Settings")
+        val window = CustomWindowSettings("Simulation Settings")
+        buttonControl.addClickListener { clickEvent ->
+            this.ui.ui.addWindow(window)
+        }
+        window.addCloseListener {
+            refreshUI()
+        }
+
+        val buttonRun = Button("Run Simulation")
+        buttonRun.addClickListener { e ->
+            refreshUI()
+        }
+        layoutControl.addComponent(lblControl)
+        layoutControl.addComponent(buttonControl)
+        layoutControl.addComponents(buttonRun)
+        return layoutControl
+    }
+
+
+    /**
+     * Create image of the SD model.
+     */
+    private fun createBackendSection(): VerticalLayout {
+        val layoutModel = VerticalLayout()
+        layoutModel.setWidth(LAYOUT_WIDTH_COLUMN2)
+
+        val lblModel = Label("MODEL (backend):")
+        lblModel.setHeight("24px")
+        lblModel.styleName = ValoTheme.LABEL_COLORED
+
+        val imageFileName0 = "/" + "NoModelImage.png"
+        val imageFileName1 = "/" + simulation.model.javaClass.name.substringAfterLast(".") + ".png"
+        val imageFileName2 = "/" + simulation.model.javaClass.name.substringAfterLast(".") + ".jpg"
+        val sc = VaadinServlet.getCurrent().servletContext
+        val path0 = sc.getRealPath(imageFileName0)
+        val path1 = sc.getRealPath(imageFileName1)
+        val path2 = sc.getRealPath(imageFileName2)
+
+        val loader: ClassLoader = this::class.java.getClassLoader()
+        val url0 = loader.getResource(imageFileName0)
+        val url1 = loader.getResource(imageFileName1)
+        val url2 = loader.getResource(imageFileName2)
+
+        val path = if (url1 != null) {
+            path1
+        } else {
+            if (url2 != null) {
+                path2
+            } else {
+                path0
+            }
+        }
+
+        val resource = ClassResource("/" + path.substringAfterLast("""\"""))
+        val image = Image(null, resource)
+
+        image.setSizeFull()
+
+        layoutModel.addComponent(lblModel)
+        layoutModel.addComponent(image)
+
+        return layoutModel
+    }
+
+
+    /**
+     * Create output Chart section.
+     */
+    private fun createChartSection(): VerticalLayout {
+        val layoutOutput1 = VerticalLayout()
+        layoutOutput1.setWidth(LAYOUT_WIDTH_COLUMN3)
+
+        val lblOutput1 = Label("OUTPUT (graph):")
+        lblOutput1.setHeight("24px")
+        lblOutput1.styleName = ValoTheme.LABEL_COLORED
+
+        val chart = Chart()
+
+        val configuration = chart.configuration
+        configuration.chart.type = ChartType.LINE
+        configuration.title.text = ""
+        configuration.subTitle.text = ""
+
+        val yAxis = configuration.getyAxis()
+        yAxis.setTitle("Value")
+
+        val xAxis = configuration.getxAxis()
+        xAxis.setTitle("Time [$timeUnit]")
+
+        val legend = configuration.legend
+        legend.layout = LayoutDirection.VERTICAL
+        legend.align = HorizontalAlign.RIGHT
+        legend.verticalAlign = VerticalAlign.TOP
+        legend.borderWidth = 0
+
+        val startTime = time[0]
+        val endTime = time[time.size - 1]
+        val intervalTime = time[1] - time[0]
+        val plotOptions = PlotOptionsLine()
+        plotOptions.pointStart = startTime
+        plotOptions.pointInterval = intervalTime
+        configuration.setPlotOptions(plotOptions)
+
+        if (seriesNames.maxOf { it.length } > 25) {
+            legend.enabled = false
+        }
+
+        for (i in 0 until Companion.seriesValues.size) {
+            configuration.addSeries(Companion.seriesValues[i])
+        }
+        chart.drawChart(configuration)
+
+        layoutOutput1.addComponent(lblOutput1)
+        layoutOutput1.addComponent(chart)
+
+        return layoutOutput1
+    }
+
+
+    /**
+     * Create output Grid section.
+     */
+    private fun createGridSection(): VerticalLayout {
+
+        val layoutOutput2 = VerticalLayout()
+
+        val lblOutput2 = Label("OUTPUT (grid):")
+        lblOutput2.setHeight("24px")
+        lblOutput2.styleName = ValoTheme.LABEL_COLORED
+
+        val dataRowsSize = Companion.seriesValues.size
+
+        val rowNames = mutableListOf("Time" + " [${simulation.model.timeUnit}]")
+        for (index in 0 until dataRowsSize) {
+            rowNames.add(seriesValues[index].name + " [${seriesUnits[index]}]")
+        }
+
+        val rows = ArrayList<LinkedHashMap<String, String>>(rowNames.size * Companion.seriesValues[0].data.size)
+        var series1: Array<Number>
+        var series2: ArrayList<Double>
+        for (i in 0..time.indices.last) {
+            val fakeBean = LinkedHashMap<String, String>()
+            for (j in 0..rowNames.indices.last) {
+                if (j > 0) {
+                    series1 = (Companion.seriesValues[j - 1].data)
+                    fakeBean[rowNames[j]] = series1[i].toString()
+                } else {
+                    series2 = time
+                    fakeBean[rowNames[j]] = series2[i].toString()
+                }
+
+            }
+            rows.add(fakeBean)
+        }
+
+        val grid = Grid<LinkedHashMap<String, String>>()
+        grid.setItems(rows)
+        grid.setSizeFull()
+
+        val s = rows[0]
+        for (entry in s.entries) {
+            grid.addColumn<String> { h -> h[entry.key] }.caption = entry.key
+        }
+        grid.styleName = "smallgrid"
+
+        layoutOutput2.addComponent(lblOutput2)
+        layoutOutput2.addComponent(grid)
+
+        return layoutOutput2
+    }
+
+
+    /**
+     * Create output Spreadsheet section.
+     */
+    private fun createSpreadsheetSection(): VerticalLayout {
+        val layoutOutput2 = VerticalLayout()
+
+        val lblOutput2 = Label("OUTPUT (spreadsheet):")
+        lblOutput2.setHeight("24px")
+        lblOutput2.styleName = ValoTheme.LABEL_COLORED
+
+        val dataColumnsSize = Companion.seriesValues[2].data.size
+        val dataRowsSize = Companion.seriesValues.size
+
+        val sheet = Spreadsheet()
+        if (DATA_IN_ROWS == true) {
+            sheet.createNewSheet("Output", dataRowsSize + 1, dataColumnsSize + 1)
+        } else {
+            sheet.createNewSheet("Output", dataColumnsSize + 1, dataRowsSize + 1)
+        }
+
+        sheet.isReportStyle = true
+        sheet.setWidth(LAYOUT_WIDTH_COLUMN3)
+
+        val newCellStyle = sheet.workbook.createCellStyle()
+        val format = sheet.workbook.createDataFormat()
+
+        newCellStyle.dataFormat = format.getFormat("#,##0.00")
+
+        val rowNames = mutableListOf("Time" + " [${simulation.model.timeUnit}]")
+        for (index in 0 until dataRowsSize) {
+            rowNames.add(seriesValues[index].name + " [${seriesUnits[index]}]")
+        }
+
+        for (rowName in rowNames) {
+            if (DATA_IN_ROWS) {
+                sheet.createCell(rowNames.indexOf(rowName), 0, rowName)
+                sheet.autofitColumn(rowNames.indexOf(rowName))
+            } else {
+                sheet.createCell(0, rowNames.indexOf(rowName), rowName)
+                sheet.autofitColumn(rowNames.indexOf(rowName))
+            }
+
+        }
+
+
+        /*
+        run {
+            var i = 0
+            while (i < dataLength) {
+                val point = Companion.seriesValue[2].data[i]
+                Companion.seriesValue[2].updatePoint(i, point as Double * 12.0 * 100.0)
+                i = i + 1
+            }
+        }
+        */
+
+        val rows = ArrayList<LinkedHashMap<String, String>>(rowNames.size * Companion.seriesValues[0].data.size)
+        var series1: Array<Number>
+        var series2: ArrayList<Double>
+        for (i in 0..time.indices.last) {
+            val fakeBean = LinkedHashMap<String, String>()
+            for (j in 0..rowNames.indices.last) {
+                if (j > 0) {
+                    series1 = (Companion.seriesValues[j - 1].data)
+                    fakeBean[rowNames[j]] = series1[i].toString()
+                } else {
+                    series2 = time
+                    fakeBean[rowNames[j]] = series2[i].toString()
+                }
+
+            }
+            rows.add(fakeBean)
+        }
+
+        val cellsToRefresh = ArrayList<Cell>()
+        var cell: Cell
+        for (rowName in rowNames) {
+            for (row in rows) {
+                if (DATA_IN_ROWS) {
+                    cell = sheet.createCell(rowNames.indexOf(rowName), rows.indexOf(row) + 1, row[rowName]?.toDouble())
+                } else {
+                    cell = sheet.createCell(rows.indexOf(row) + 1, rowNames.indexOf(rowName), row[rowName]?.toDouble())
+                }
+
+                cell.cellStyle = newCellStyle
+                cellsToRefresh.add(cell)
+            }
+            sheet.autofitColumn(rowNames.indexOf(rowName))
+        }
+        sheet.refreshCells(cellsToRefresh)
+
+        layoutOutput2.addComponent(lblOutput2)
+        sheet.setSizeFull()
+        layoutOutput2.addComponent(sheet)
+        return layoutOutput2
+    }
+
+}

ksdtoolkit-webapp/src/main/resources/AppWidgetset.gwt.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE module PUBLIC "-//Vaadin//DTD Vaadin 7//EN" "https://raw.github.com/vaadin/gwt/master/distro-source/core/src/gwt-module.dtd">
+<!-- WS Compiler: manually edited -->
+<module>
+        <inherits name="com.vaadin.DefaultWidgetSet" />
+        <inherits name="com.vaadin.addon.charts.Widgetset" />
+        <inherits name="com.vaadin.addon.spreadsheet.Widgetset" />
+        <inherits name="org.dussan.vaadin.dcharts.DchartsWidgetset" />
+        <set-configuration-property name="devModeRedirectEnabled" value="true" />
+        <set-property name="user.agent" value="gecko1_8,safari,ie10" />
+        <source path="client" />
+        <source path="shared" />
+        <collapse-all-properties />
+        <set-property name="compiler.useSymbolMaps" value="true" />
+</module>

ksdtoolkit-webapp/src/main/resources/README

@@ -0,0 +1 @@
+Please add your static resources here

ksdtoolkit-webapp/src/main/webapp/VAADIN/addons/spreadsheet/spreadsheet.scss

@@ -0,0 +1,45 @@
+@import "spreadsheet-valo";
+@import "spreadsheet-legacy";
+
+$v-color-keywords: non-valo-theme !default;
+
+@mixin spreadsheet {
+	
+	// Very nice workaround for missing variable-exists function
+	@if $v-color-keywords == non-valo-theme {
+	    @include spreadsheet-legacy;
+	} @else {
+		@include spreadsheet-valo;
+	} 
+	
+	span.code-snippet {
+		font-family: "Courier New",Courier,monospace;
+	}
+
+	.v-label-overlay-content {
+		padding: 10px;
+	}
+
+  .sheet-image > .v-csslayout {
+    overflow: visible;
+    position: relative;
+    
+    .v-button-minimize-button {
+      top: -14px;
+      position: absolute;
+      height: auto;
+      padding: 0;
+      
+      &::after {
+        -webkit-box-shadow: none;
+        -moz-shadow: none;
+        -ms-shadow: none;
+        box-shadow: none;
+      }
+            
+      .v-button-caption {
+        display: none;
+      }
+    }
+  }
+}

ksdtoolkit-webapp/src/main/webapp/VAADIN/addons/spreadsheet/styles/_grouping.scss

@@ -0,0 +1,208 @@
+@mixin grouping {
+  .col-group-pane,
+  .col-group-freeze-pane {
+    position: absolute;
+    left: 0;
+    width: 100%;
+
+    z-index: 11;
+    background-color: $address-field-background;
+
+    border-bottom: $header-border;
+    box-sizing: border-box;
+
+    .grouping {
+      position: absolute;
+      height: 7px;
+      border-top: 2px solid $spreadsheet-header-grouping-color;
+      border-left: 2px solid $spreadsheet-header-grouping-color;
+      cursor: pointer;
+
+      .expand {
+        position: relative;
+        top: -7px;
+        float: right;
+        right: -4px;
+        height: 12px;
+        width: 12px;
+        background-color: $spreadsheet-header-grouping-color;
+        color: white;
+        border: none;
+        line-height: 11px;
+        text-align: center;
+        vertical-align: middle;
+        border-radius: 50%;
+        font-size: 12px;
+      }
+
+      &.plus {
+        border: none;
+
+        .expand {
+          top: -5px;
+        }
+      }
+    }
+
+    .grouping.inversed {
+      border-right: 2px solid $spreadsheet-header-grouping-color;
+      border-left: none;
+      .expand {
+        right: initial;
+        left: -4px;
+        float: none;
+      }
+    }
+
+  }
+  .col-group-freeze-pane {
+    overflow: hidden;
+    border-right: $spreadsheet-freeze-pane-border;
+  }
+
+  .col-group-border {
+    position: absolute;
+
+    .border {
+      position: absolute;
+      width: 100%;
+      z-index: 15;
+      border-bottom: 1px dotted $spreadsheet-header-grouping-color;
+      margin-top: 20px;
+    }
+  }
+
+  .row-group-pane,
+  .row-group-freeze-pane {
+    position: absolute;
+    left: 0;
+    height: 100%;
+
+    z-index: 11;
+    background-color: $address-field-background;
+
+    border-right: $header-border;
+    box-sizing: border-box;
+
+    .grouping {
+      position: absolute;
+      width: 8px;
+      border-top: 2px solid $spreadsheet-header-grouping-color;
+      border-left: 2px solid $spreadsheet-header-grouping-color;
+      cursor: pointer;
+
+      &.plus {
+        border: none;
+      }
+
+      .expand {
+        position: absolute;
+        bottom: -4px;
+        right: 2px;
+        height: 12px;
+        width: 12px;
+        background-color: $spreadsheet-header-grouping-color;
+        color: white;
+        border: none;
+        line-height: 11px;
+        text-align: center;
+        vertical-align: middle;
+        border-radius: 50%;
+        font-size: 12px;
+      }
+
+      &.plus {
+        .expand {
+          right: 0;
+        }
+      }
+    }
+    .grouping.inversed {
+      border-top: none;
+      border-bottom: 2px solid $spreadsheet-header-grouping-color;
+      .expand {
+        bottom: initial;
+        top: -5px;
+      }
+    }
+  }
+  .row-group-freeze-pane {
+    overflow: hidden;
+    border-bottom: $spreadsheet-freeze-pane-border;
+  }
+
+  .row-group-border {
+    position: absolute;
+
+    .border {
+      position: absolute;
+      height: 100%;
+      z-index: 15;
+      border-right: 1px dotted $spreadsheet-header-grouping-color;
+      /*margin-top: 20px;*/
+    }
+  }
+
+  .expandbutton {
+    height: 18px;
+    width: 11px;
+    line-height: 18px;
+    font-size: 11px;
+    text-align: center;
+    cursor: pointer;
+    color: darken($spreadsheet-header-grouping-color, 50%);
+
+    span {
+      vertical-align: text-top;
+    }
+  }
+
+  .expandbutton:active {
+    border-color: gray;
+  }
+
+  .col-group-summary {
+    .expandbutton {
+      margin-left: auto;
+      margin-right: 4px;
+      /*margin-top: 7px;*/
+    }
+  }
+  .row-group-summary {
+    .expandbutton {
+      display: inline-block;
+      margin-left: 4px;
+    }
+  }
+
+  .grouping-corner {
+    position: absolute;
+    left: 0;
+    z-index: 15;
+    border-right: $header-border;
+    border-bottom: $header-border;
+    box-sizing: border-box;
+    background-color: $address-field-background;
+  }
+  .col-group-summary {
+    position: absolute;
+    box-sizing: border-box;
+    border-bottom: $header-border;
+    border-right: $header-border;
+    background-color: $address-field-background;
+    z-index: 15;
+  }
+  .row-group-summary {
+    position: absolute;
+    box-sizing: border-box;
+    border-bottom: $header-border;
+    border-right: $header-border;
+    background-color: $address-field-background;
+    left: 0;
+    z-index: 15;
+  }
+
+  .v-ie & .grouping .expand {
+    line-height: 13px;
+  }
+}