Rainbow Butterfly

by bkzen 19 Jan 2011

• Forked from makc3d's Butterfly
• Diff: 45
• Related works: 2
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// forked from makc3d's Butterfly
package {
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Graphics;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.ColorTransform;
    import frocessing.color.ColorHSV;
    [SWF (backgroundColor = "0x000000", frameRate = "60", width = "465", height = "465")]
    public class Butterfly extends Sprite{
        public function Butterfly () {
            addChild(new Bitmap(bmd = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0), "auto", true));
            canvas = new Shape()
            addEventListener (Event.ENTER_FRAME, loop);
            var i:int, n: int = 10;
            for (i = 0; i < n; i++) 
            {
                addEventListener (Event.ENTER_FRAME, getLoop(-0.2 + i * 0.8));
            }
            addEventListener (Event.ENTER_FRAME, endLoop);
        }
        private const colorTf: ColorTransform = new ColorTransform(1, 1, 1, 1, -4, -4, -4);
        private var bmd:BitmapData;
        private var canvas:Shape;
        private function loop(e: Event): void 
        {
            bmd.lock();
            bmd.colorTransform(bmd.rect, colorTf);
        }
        
        private function getLoop(t: Number): Function
        {
            var color: ColorHSV = new ColorHSV();
            return function (e: Event): void
            {
                color.h = t * 20;
                var g: Graphics = canvas.graphics, r: Number;
                g.clear();
                g.lineStyle(0, color.value);
                r = Math.exp (Math.sin (t)) - 2 * Math.cos (4 * t) + Math.pow (Math.sin ((t - Math.PI / 2) / 12), 5);
                g.moveTo (465 / 2 + 50 * r * Math.cos (t), 465 / 2 - 30 * r * Math.sin (t));
                t += 0.03;
                r = Math.exp (Math.sin (t)) - 2 * Math.cos (4 * t) + Math.pow (Math.sin ((t - Math.PI / 2) / 12), 5);
                g.lineTo (465 / 2 + 50 * r * Math.cos (t), 465 / 2 - 30 * r * Math.sin (t));
                bmd.draw(canvas);
            }
        }
        
        private function endLoop(e:Event):void 
        {
            bmd.unlock();
        }
    }
}