コッホ雪片

コッホ雪片 by ton
created:2008/12/21 22:45:47
ずっと動かしてるとめちゃくちゃ重くなるから注意してね！

by ton 24 Dec 2008

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fractal
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//コッホ雪片 by ton
//created:2008/12/21 22:45:47
//ずっと動かしてるとめちゃくちゃ重くなるから注意してね！
package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.geom.Point;

    [SWF(width=465, height=465, frameRate=60, backgroundColor=0x000000)]
    public class KochSnow extends Sprite {
	private var list:Array = [];
	private var endPoint:Point;
	private const W:int = stage.stageWidth;
	private const H:int = stage.stageHeight;
	private const L:int = W/2;

	function KochSnow() {
            var p1:Point = new Point(W/2, H/2 - L);
            var p2:Point = new Point(L * Math.cos(Math.PI/6) + W/2, L * Math.sin(Math.PI/6) + H/2);
            var p3:Point = new Point(L * Math.cos(Math.PI/6*5) + W/2, L * Math.sin(Math.PI/6) + H/2);

            addLine(p1, p2);
            addLine(p2, p3);
            addLine(p3, p1);

	    stage.addEventListener(Event.ENTER_FRAME,onEnterFrameHandler);
	}
	
        private function onEnterFrameHandler(event:Event):void {
	    var line:Line=list[0];
	    stage.removeChild(line);
	    list.splice(0, 1);

	    var p1:Point=new Point(Math.cos(line.angle)*line.distance/3+line.startP.x,                                 Math.sin(line.angle)*line.distance/3+line.startP.y);
	    var p2:Point=new Point();
	    p2.x=Math.cos(line.angle - Math.PI / 3) * line.distance / 3 + p1.x;
	    p2.y=Math.sin(line.angle - Math.PI / 3) * line.distance / 3 + p1.y;
	    var p3:Point=new Point();
	    p3.x=Math.cos(line.angle + Math.PI / 3) * line.distance / 3 + p2.x;
	    p3.y=Math.sin(line.angle + Math.PI / 3) * line.distance / 3 + p2.y;
  
            addLine(line.startP, p1);
            addLine(p1, p2);
            addLine(p2, p3);
            addLine(p3, line.endP);  
        }

        private function addLine(p1:Point, p2:Point):void{
            var line:Line = new Line(p1, p2);
            stage.addChild(line);
            list.push(line);
        }
    }
}


import flash.display.Shape;
import flash.geom.Point;

class Line extends Shape{

    public var startP:Point;
    public var endP:Point;
    public var distance:Number;
    public var angle:Number;

    function Line(startP:Point, endP:Point) {
	this.startP = startP;
	this.endP = endP;
	distance = Point.distance(startP, endP);
	angle = Math.atan2(endP.y-startP.y, endP.x-startP.x);
	
	graphics.lineStyle(0,0xffffff);
	graphics.moveTo(startP.x, startP.y);
	graphics.lineTo(endP.x, endP.y);
	graphics.endFill();
    }
}