Quasimondo的分割

by keno42 02 May 2009

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package {
    import flash.display.*;
    import flash.geom.*;
    import flash.events.*;
    public class FlashTest extends Sprite {
        private var triangles:Vector.<Point> = new Vector.<Point>;
        private var cornerNum:int = 3;
        private var defaultLength:Number = 200;
        private var centerX:Number = 232;
        private var centerY:Number = 232;
        private var s1:Sprite = new Sprite();
        private var g1:Graphics = s1.graphics;
        private var bitmapData:BitmapData = new BitmapData(465, 465, true, 0x0);
        private var b1:Bitmap = new Bitmap(bitmapData);
        public function FlashTest() {
            // write as3 code here..
            for( var i:int = 0; i < cornerNum; i++ ){
                triangles.push( new Point(
                    defaultLength * Math.cos( 2 * Math.PI * i / cornerNum ) + centerX,
                    defaultLength * Math.sin( 2 * Math.PI * i / cornerNum ) + centerY
                ) );
            }
            g1.lineStyle(0, 0, 0.3);
            g1.beginFill(0xFFFFFFFF * Math.random(), 0.2);
            g1.moveTo(triangles[cornerNum-1].x, triangles[cornerNum-1].y);
            for( i = 0; i < cornerNum; i++ ){
                g1.lineTo(triangles[i].x, triangles[i].y);
            }
            this.addChild( b1 );
            s1.x = s1.y = 232;
            stage.addEventListener( MouseEvent.MOUSE_UP, onMouseUp );
            stage.addEventListener( Event.ENTER_FRAME, onEnterFrame );
        }
        private function onMouseUp(e: MouseEvent):void{
        }
        private function onEnterFrame(e: Event):void{
            divideTriangle();
        }
        private function divideTriangle():void{
            var n:int = Math.random() * (triangles.length/3);
            n *= Math.random() * Math.random(); // weight on bigger triangles
            n *= 3;
            var pointA:Point = triangles[n];
            var pointB:Point = triangles[n+1];
            var pointC:Point = triangles[n+2];
            var s:Number = Math.random();
            var t:Number = Math.random();
            var u:Number = Math.random();
            s = t = u = 0.5;
            var pointAB:Point = pointB.subtract(pointA);
            var pointBC:Point = pointC.subtract(pointB);
            var pointCA:Point = pointA.subtract(pointC);
            var pointP:Point = new Point( pointA.x + s * pointAB.x, pointA.y + s * pointAB.y );
            var pointQ:Point = new Point( pointB.x + t * pointBC.x, pointB.y + t * pointBC.y );
            var pointR:Point = new Point( pointC.x + u * pointCA.x, pointC.y + u * pointCA.y );
            var color:uint = 0xFFFFFFFF * Math.random();
            g1.lineStyle(0, color);
            g1.beginFill(color, 0.5);
            g1.moveTo( pointR.x, pointR.y );
            g1.lineTo( pointP.x, pointP.y );
            g1.lineTo( pointQ.x, pointQ.y );
            g1.lineTo( pointR.x, pointR.y );
            bitmapData.draw(s1);
            g1.clear();

            triangles.splice( n, 3 );
            triangles.push( pointA );
            triangles.push( pointP );
            triangles.push( pointR );
            triangles.push( pointB );
            triangles.push( pointQ );
            triangles.push( pointP );
            triangles.push( pointC );
            triangles.push( pointR );
            triangles.push( pointQ );
            triangles.push( pointP );
            triangles.push( pointQ );
            triangles.push( pointR );
       }
    }
}