弹性鼠标跟随

最新推荐文章于 2025-08-15 22:56:20 发布

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最新推荐文章于 2025-08-15 22:56:20 发布

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CC 4.0 BY-SA版权

文章标签： java

原文链接：http://www.cnblogs.com/HelloCG/archive/2008/12/31/1366155.html

1.创建小球精灵

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.构建弹性鼠标跟随动画

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

    public class Spring extends Sprite
    {
        private var ball:Ball;
        private var spring:Number=0.1;
        private var vx:Number=0;
        private var vy:Number=0;
        private var friction:Number=0.9;
        private var gravity:Number=0.5;

        public function Spring ()
        {
            Init ();
        }
        public function Init ():void
        {
            ball=new Ball(20,0xFF00FF);
            addChild (ball);
            addEventListener (Event.ENTER_FRAME,EnterFrame);
        }
        private function EnterFrame (e:Event):void
        {
            var dx:Number=mouseX-ball.x;
            var dy:Number=mouseY-ball.y;
            var ax:Number=dx*spring;
            var ay:Number=dy*spring;
            vx+=ax;
            vy+=ay;
            vy+=gravity;
            vx*=friction;
            vy*=friction;
            ball.x+=vx;
            ball.y+=vy;
            graphics.clear ();
            graphics.lineStyle (1);
            graphics.moveTo (ball.x,ball.y);
            graphics.lineTo (mouseX,mouseY);

        }
    }
}

注意：帧率提高，效果会准确。

转载于:https://www.cnblogs.com/HelloCG/archive/2008/12/31/1366155.html