Polygon View

[soywiz]

In the case you want to generate symmetric polygons like pentagons, hexagons and so on:

inline fun Container.polygon(
		radius: Double = 16.0,
		sides: Int = 5,
		color: RGBA = Colors.WHITE,
		autoScaling: Boolean = true,
		callback: Polygon.() -> Unit = {}
): Polygon = Polygon(radius, sides, color, autoScaling).addTo(this).apply(callback)

class Polygon(
	radius: Double = 16.0,
	sides: Int = 5,
	color: RGBA = Colors.WHITE,
	autoScaling: Boolean = true
) : Graphics(autoScaling = autoScaling) {
	/** Radius of the circle */
	var radius: Double by uiObservable(radius) { updateGraphics() }

	/** Number of sides of the polygon */
	var sides: Int by uiObservable(sides) { updateGraphics() }

	/** Color of the circle. Internally it uses the [colorMul] property */
	var color: RGBA
		get() = colorMul
		set(value) { colorMul = value }

	override val bwidth get() = radius * 2
	override val bheight get() = radius * 2

	init {
		this.color = color
		updateGraphics()
	}

	private fun updateGraphics() {
		clear()
		fill(Colors.WHITE) {
			for (n in 0 until sides) {
				val angle = ((360.degrees * n) / sides) - 90.degrees
				val x = radius * angle.cosine
				val y = radius * angle.sine
				//println("$x, $y")
				if (n == 0) {
					moveTo(x, y)
				} else {
					lineTo(x, y)
				}
			}
			close()
		}
	}
}