forked from: flash on 2010-3-9

/**
 * Copyright meat18 ( http://wonderfl.net/user/meat18 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/x8AO
 */

// forked from 084's flash on 2010-3-9
//跳ね返るたびにボールの色を変えたかったんですが．．．。これじゃだめなんですね。
package {
import flash.display.Sprite;
import flash.events.Event;
import flash.media.Video;
	public class Bouncing extends Sprite {
		private var ball:Ball;
		private var vx:Number;
		private var vy:Number;
		
		public function Bouncing() {
			init();
		}
		
		/*
		オチから先に言うと、ボールを新しい色で塗りなおしてないだけです。
		ball.init()しなおすだけでいいです。
		*/
		
		private function init():void {
			//stage.scaleMode = StageScaleMode.NO_SCALE;
			//stage.align = StageAlign.TOP_LEFT;
			ball = new Ball();
			ball.x = stage.stageWidth / 2;
			ball.y = stage.stageHeight / 2;
			vx = Math.random() * 10 - 5;
			vy = Math.random() * 10 - 5;
			addChild(ball);
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
		}
		
		private function onEnterFrame(event:Event):void {
			ball.x += vx;
			ball.y += vy;
			var left:Number = 0;
			var right:Number = stage.stageWidth;
			var top:Number = 0;
			var bottom:Number = stage.stageHeight;
			
			if (ball.x  + ball.radius > right) {
				ball.x = right - ball.radius;
                                ball.color = Math.random() * 0xffffff;
                                ball.init();//普通に描画しなおせばおｋ
				vx *= -1;
			}else if (ball.x - ball.radius < left) {
				ball.x = left + ball.radius;
                                ball.color = Math.random() * 0xffffff;
                                ball.init();//普通に描画しなおせばおｋ
				vx *= -1;
			}
			if (ball.y + ball.radius > bottom) {
				ball.y = bottom - ball.radius;
                                ball.color = Math.random() * 0xffffff;
                                ball.init();//普通に描画しなおせばおｋ
				vy *= -1;
			}else if (ball.y - ball.radius < top) {
				ball.y = top + ball.radius;
                                ball.color = Math.random() * 0xffffff;
                                ball.init();//普通に描画しなおせばおｋ
				vy *= -1;
			}
		}
	}
}

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 ):void {
			this.radius = radius;
			this.color = color;
		    init();
		}
		public function init():void {
			this.graphics.clear();//念のため消してから描く
			this.graphics.beginFill(color);
			this.graphics.drawCircle(0, 0, radius);
			//graphics.endFill();
		}
	}