//小球的初始位置
[code]//小球的初始位置
var ballx:Number = 275;
var bally:Number = 400;
//小球運(yùn)動(dòng)速度
var speed:Number = 5;
stage.addEventListener(MouseEvent.CLICK,shoot);
function shoot(e:MouseEvent):void
{
for(var i:int = 1;i<9;i++)
{
//從庫中創(chuàng)建小球
var ball:Ball = new Ball();
//初始化小球位置
ball.x = ballx;
ball.y = bally;
//根據(jù)三角函數(shù)計(jì)算小球的速度
ball.spdx = cosD(i*-20)*speed;
ball.spdy = sinD(i*-20)*speed;
//注冊enterFrame事件
ball.addEventListener(Event.ENTER_FRAME,ballMove);
e.target.addChild(ball);
}
}
function ballMove(e:Event):void
{
//獲取小球的引用
var obj:MovieClip = e.target;
//設(shè)置小球的坐標(biāo)，實(shí)現(xiàn)運(yùn)動(dòng)
obj.x += obj.spdx
obj.y += obj.spdy
if(obj.y<0||obj.x<0||obj.x>550||obj.y>400)
{
//移除enterFrame事件
obj.removeEventListener(Event.ENTER_FRAME,ballMove)
//從顯示列表刪除
stage.removeChild(obj)
}
}
//角度轉(zhuǎn)換為弧度
function angleToRadian(angle:Number):Number
{
return angle*(Math.PI/180);
}
function sinD(angle:Number):Number
{
return Math.sin(angleToRadian(angle));
}
function cosD(angle:Number):Number
{
return Math.cos(angleToRadian(angle));
}