【AS3代码】通过两者间的距离，检测是否碰撞

package{ import com.ui.Ball; import flash.display.Sprite; import flash.display.StageAlign; import flash.display.StageScaleMode; import flash.events.Event; import flash.events.MouseEvent; import flash.geom.Rectangle; public class Main extends Sprite { private var ball:Ball; private var ball2:Ball; public function Main():void { init(); } private function init():void { ball = new Ball(0x00ffff,Math.random() * 50); ball.x = stage.stageWidth / 2; ball.y = stage.stageHeight / 2; ball2 = new Ball(0xffff00,Math.random() * 50); ball2.startDrag(true); this.addChild(ball); this.addChild(ball2); stage.addEventListener(Event.ENTER_FRAME, onEnterFrame); } private function onEnterFrame(event:Event):void { var dx:Number = new Number(); var dy:Number = new Number(); dx = ball2.x - ball.x; dy = ball2.y - ball.y; //获得两个球圆心之间的距离公式 var dist:Number = Math.sqrt(dx*dx + dy*dy); if(dist < (ball.width / 2) + (ball2.width / 2)) { trace("撞上!"); } } }}