跟随鼠标移动的小球

点击打开链接

package {import flash.display.Sprite;import flash.events.Event;import flash.events.MouseEvent;/** * ... * @author sofeien */public class main extends Sprite {public var ball:Sprite = new Sprite();public var vx:Number = 0;public var vy:Number = 0;public var a:Number = 0;public var b:Number = 0;public var c:Number = 0;public var speed:Number = 5;public function main(){addEventListener(Event.ENTER_FRAME,frameHandler);}public function frameHandler(e:Event):void{a = mouseX - ball.x;b = mouseY - ball.y;c = Math.sqrt(a * a + b * b);//trace(a,b,c);vx = a / c * speed;vy = b / c * speed;ball.x += vx;ball.y += vy;}}}