flash on 2010-11-6

/**
 * Copyright gaina ( http://wonderfl.net/user/gaina )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/kFPL
 */

package 
{
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    
    /**
     * ...
     * @author gaina
     */
    public class Main extends Sprite 
    {
        
        public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }
        
        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            // entry point
            stage.addEventListener(MouseEvent.MOUSE_MOVE, MouseEventHandler);
        }
        
        private function MouseEventHandler(e:MouseEvent):void 
        {
            var p:Particles = new Particles();
            p.x = mouseX;
            p.y = mouseY;
            addChild(p);
            p.start();
            p.addEventListener(Event.ENTER_FRAME, check);
        }
        
        private function check(e:Event):void 
        {
            if (e.target.y > stage.stageHeight - 10) {
                e.target.removeEventListener(Event.ENTER_FRAME, check);
                e.target.eraze();
                removeChild(e.target as Particles);
            }
        }
        
    }
    
}
import flash.display.Sprite;
import flash.events.Event;

class Particles extends Sprite
{
    public var vx:Number = 1;
    public var vy:Number = 1;
    public function Particles(color:uint=0)
    {
        graphics.beginFill(color, 1);
        graphics.drawCircle(0, 0, 5);
        graphics.endFill();
    }
    
    public function start():void
    {
        this.addEventListener(Event.ENTER_FRAME, loop);
    }
    
    private function loop(e:Event):void 
    {
        this.y +=  vy;
        vy += 0.5;
        if (vy % 10 ==0) {
            vy = 1;
        }
    }
    
    public function eraze():void
    {
        this.removeEventListener(Event.ENTER_FRAME, loop);
        graphics.clear();
    }
}