ぶもも

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

package
{
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    [SWF(backgroundColor = "0x000000", width = 465, height = 465)]
    public class ex5_2 extends Sprite
    {
        private var ball:Array=[];
        private var n:int=100;
        
        public function ex5_2()
        {
            stage.scaleMode=StageScaleMode.NO_SCALE;
            stage.align=StageAlign.TOP_LEFT;
            for(var i:int=0;i<n;i++){
               ball.push(new Ball(Math.random()*30+15,Math.random()*30+15,Math.random()*0xFFFFFF));
               ball[i].x = stage.stageWidth/2;
               ball[i].y = stage.stageHeight/2;
               addChild(ball[i]);
            }
            addEventListener(Event.ENTER_FRAME,onEnterFrame);
        }
        private function onEnterFrame(e:Event):void{
            for(var i:int=0;i<n;i++){
               ball[i].move();
            }
        }
    }
}
import flash.display.Sprite;

class Ball extends Sprite{
    private var vx:Number;
    private var vy:Number;
    private var r:Number=Math.random()*10+5;
    private var g:Number=0.98;
    private var e:Number=0.9;
    public function Ball(_vx:Number,_vy:Number,color:Number){
        vx=Math.cos(Math.random()*Math.PI*2/3+Math.PI/6)*_vx;
        vy=-Math.sin(Math.random()*Math.PI*2/3+Math.PI/6)*_vy;
        
        graphics.beginFill(color);
        graphics.drawCircle(0,0,r);
        graphics.endFill();
    }
    
    public function move():void{
        this.x+=vx;
        this.y+=vy;
        
        if(this.x-r < 0){
            vx*=-e;
            this.x = r;
        }
        if(this.x+r > this.stage.stageWidth){
            vx*=-e;
            this.x = this.stage.stageWidth-r;
        }
        if(this.y-r < 0){ 
            vy*=-e;
            this.y=r;
        }
        if(this.y+r > this.stage.stageHeight){
            vy*=-e;
            this.y=this.stage.stageHeight-r;
        }
        vy+=g;
        
    }
}