简单点碰撞

最新推荐文章于 2024-07-16 22:07:16 发布

weixin_30920853

最新推荐文章于 2024-07-16 22:07:16 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/HelloCG/archive/2009/01/05/1368748.html

1.构建小球精灵

Ball.as
package
{
    import flash.display.Sprite;

    public class Ball extends Sprite
    {
        public var radius:Number;
        public var color:uint;

        public function Ball (radius:Number,color:uint)
        {
            this.radius=radius;
            this.color=color;
            Init ();
        }
        public function Init ():void
        {
            graphics.beginFill (color);
            graphics.drawCircle (0,0,radius);
            graphics.endFill ();
        }
    }
}

2.构建精灵和点碰撞

PointHitTest.as
package
{
    import flash.display.Sprite;
    import flash.events.Event;

    public class PointHitTest extends Sprite
    {
        private var ball:Ball;

        public function PointHitTest ()
        {
            Init ();
        }
        private function Init ():void
        {
            ball=new Ball(20,0xFF0000);
            addChild (ball);
            ball.x=stage.stageWidth/2;
            ball.y=stage.stageHeight/2;
            addEventListener (Event.ENTER_FRAME,EnterFrame);
        }
        private function EnterFrame (e:Event):void
        {
            if (ball.hitTestPoint(mouseX,mouseY))
            {
                trace ("Hit.");
            }
        }
    }
}

不准确，和边界盒进行测试。

如果进行精确碰撞，也就是对可视区域进行碰撞测试（而不是边界盒）用:

ball.hitTestPoint(mouseX,mouseY,true)

转载于:https://www.cnblogs.com/HelloCG/archive/2009/01/05/1368748.html