領域外に出たスプライトの削除

いまいち配列のことは理解していない。

by Nowloading_ 21 Mar 2011

• Related works: 1
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/**
 * Copyright Nowloading_ ( http://wonderfl.net/user/Nowloading_ )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/ynEl
 */

package {
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
    
    public class Removal extends Sprite{
        private var count:int=20;
        private var balls:Array; 
        //領域の設定
        private var top:Number = 50;
        private var bottom:Number = 365;
        private var left:Number = 50;
        private var right:Number =365;
        public function Removal(){
            init();
        }
        private function init():void{
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            balls = new Array();
            for(var i:int=0;i<count;i++){
                var color:uint = Math.random()*0xf0f0f0;
                var ball:Ball = new Ball(10,color);
                ball.x = Math.random()*right;
                ball.y = Math.random()*bottom;
                ball.vx = Math.random()*5-1;
                ball.vy = Math.random()*5-1;
                addChild(ball);
                balls.push(ball);
            }
            addEventListener(Event.ENTER_FRAME,onEnterFlame);
        }
        private function onEnterFlame(e:Event):void{
            for(var i:Number=0;i<balls.length;i++){
                var ball:Ball = Ball(balls[i]);
                ball.x+=ball.vx;
                ball.y+=ball.vy;
                if(ball.x-ball.radius>right || 
                ball.x+ball.radius<left ||
                ball.y-ball.radius>bottom ||
                ball.y+ball.radius<top){
                    removeChild(ball);
                    balls.splice(i,1);
                    if(balls.length<=0){
                        removeEventListener(Event.ENTER_FRAME,onEnterFlame);
                    }
                }
            }
        }
    }
}

import flash.display.Sprite;
    class Ball extends Sprite{
        public var radius:Number;
        public var color:uint;
        public var vx:Number =0;
        public var vy:Number =0;
        
        public function Ball(radius:Number = 40,color:uint = 0xff0000){
            this.radius = radius;
            this.color = color;
            init();
        }
        public function init():void{
            graphics.beginFill(color);
            graphics.drawCircle(0,0,radius);
            graphics.endFill();
        }
    }