Sierpinsky.hx

import flash.display.Graphics;
import flash.display.Sprite;

class Point extends flash.geom.Point {
    public function new(x,y) {
        super(x,y);
    }

    public function mid(pt2:Point) {
        return new Point((pt2.x+x)/2, (pt2.y+y)/2);
    }
}

class Sierpinsky extends Sprite {
    public var w:Int;
    public var h:Int;

    public function new() {
        super();

        flash.Lib.current.addChild(this);

        w = flash.Lib.current.stage.stageWidth;
        h = flash.Lib.current.stage.stageHeight;
    }

    public function triangle(a:Point, b:Point, c:Point) {
        graphics.moveTo(a.x, a.y);
        graphics.lineStyle(1);

        graphics.lineTo(b.x, b.y);
        graphics.lineTo(c.x, c.y);
        graphics.lineTo(a.x, a.y);

    }

    public function sier(a:Point, b:Point, c:Point, iter:Int) {
        if(iter == 0) {
            return ;
        }

        triangle(a.mid(b),b.mid(c),c.mid(a));

        sier(a.mid(b), b, b.mid(c), iter-1);
        sier(a.mid(b), a, a.mid(c), iter-1);
        sier(b.mid(c), a.mid(c), c, iter-1);
    }

    public static function main() {
        var s = new Sierpinsky();

        s.triangle(new Point(s.w / 2, 0), new Point(s.w,s.h), new Point(0,s.h));
        s.sier(new Point(s.w / 2, 0), new Point(s.w,s.h), new Point(0,s.h), 7);
    }

}