Added asteroids sample

sample-asteroids/.gitignore

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+/build

sample-asteroids/src/commonMain/kotlin/main.kt

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+import com.soywiz.korev.*
+import com.soywiz.korge.*
+import com.soywiz.korge.view.*
+import com.soywiz.korim.bitmap.*
+import com.soywiz.korim.color.*
+import com.soywiz.korim.vector.*
+import com.soywiz.korma.geom.*
+import com.soywiz.korma.geom.vector.*
+
+val WIDTH = 640
+val HEIGHT = 480
+
+suspend fun main() = Korge(width = WIDTH, height = HEIGHT, virtualWidth = WIDTH, virtualHeight = HEIGHT) {
+	val assets = Assets()
+
+	solidRect(WIDTH, HEIGHT, Colors["#222"])
+	val ship = image(assets.shipBitmap).center().position(320, 240)
+
+	val pressing = BooleanArray(Key.MAX)
+	fun pressing(key: Key) = pressing[key.ordinal]
+	keys {
+		down { pressing[key.ordinal] = true }
+		up { pressing[key.ordinal] = false }
+	}
+
+	var bulletReload = 0
+	addUpdater {
+		if (pressing(Key.LEFT)) ship.rotation -= 3.degrees
+		if (pressing(Key.RIGHT)) ship.rotation += 3.degrees
+		if (pressing(Key.UP)) ship.advance(2.0)
+		if (pressing(Key.DOWN)) ship.advance(-1.5)
+
+		if (bulletReload > 0) bulletReload--
+
+		if (bulletReload <= 0 && pressing(Key.SPACE)) {
+			bulletReload = 6
+			val bullet = image(assets.bulletBitmap)
+				.center()
+				.position(ship.x, ship.y)
+				.rotation(ship.rotation)
+				.advance(assets.shipSize * 0.75)
+
+			fun bulletFrame() {
+				bullet.advance(+3.0)
+				if (bullet.x < 10 || bullet.y < 10 || bullet.x > WIDTH + 10 || bullet.y > HEIGHT + 10) {
+					bullet.removeFromParent()
+				}
+			}
+
+			//launch {
+			//	while (true) {
+			//		bulletFrame()
+			//		bullet.delayFrame()
+			//	}
+			//}
+			bullet.addUpdater { bulletFrame()  }
+		}
+	}
+
+	//image(shipBitmap)
+}
+
+suspend fun waitFrame() {
+
+}
+
+fun View.advance(amount: Double, rot: Angle = (-90).degrees) = this.apply {
+	x += (this.rotation + rot).cosine * amount
+	y += (this.rotation + rot).sine * amount
+}
+
+inline fun View.advance(amount: Number, rot: Angle = (-90).degrees) = advance(amount.toDouble(), rot)
+
+class Assets {
+	val shipSize = 24
+	val shipBitmap = NativeImage(shipSize, shipSize).context2d {
+		lineWidth = shipSize * 0.05
+		lineCap = Context2d.LineCap.ROUND
+		stroke(Colors.WHITE) {
+			moveTo(shipSize * 0.5, 0)
+			lineTo(shipSize, shipSize)
+			lineTo(shipSize * 0.5, shipSize * 0.8)
+			lineTo(0, shipSize)
+			close()
+		}
+	}
+	val bulletBitmap = NativeImage(3, (shipSize * 0.3).toInt()).context2d {
+		lineWidth = 1.0
+		lineCap = Context2d.LineCap.ROUND
+		stroke(Colors.WHITE) {
+			moveTo(width / 2, 0)
+			lineToV(height)
+		}
+	}
+}