ball.as

我在08年11月利用flex3.0 mxml和as3.0设计的一个3D相册,用到trans matrix和一些控件 6个源码文件 具体效果请看 http://www.macs.hw.ac.u

package {
	//Remember? Haha. I wish I can use similar way to solve bounce from edge.
	//but this failed.
	//and I realized that mxml and actionscript are not same.
	//so I changed mind and started to reasearch NodeGarden.as and tried to find some solution.
	import flash.display.Sprite;
	
	public class Ball extends Sprite 
	{
		public var radius:Number;
		private var color:uint;
		public var vx:Number = 0;
		public var vy:Number = 0;
			
			public var bottom:Number;
			public var ay:Number = .5; //acceleration in y	
			public var bounceFactor:Number = 0.7;
			
		
		public function Ball(radius:Number=40, color:uint=0xff0000) {
			this.radius = radius;
			this.color = color;
			init();
		}
		
		public function setInitialConditions(x:Number, y:Number, vy:Number):void {
		this.x = x; this.y = y; this.vy = vy;		
	}
		
		public function setBottomBounceLimit(b:Number):void{
		bottom=b;
		//the way to let Big Blue Ball bounce from bottom. 
	}
		
		
		
		public function init():void {
			graphics.beginFill(color);
			graphics.drawCircle(0, 0, radius);
			graphics.endFill();
		}
		
		public function advance( ):void {
		vy += ay; //Calculate velocity
		y += vy;   //Calculate position
		
		if(y + height > bottom) {
			y = bottom - height;
			vy *= -1*bounceFactor;
		}
		
		
	}
}
}