//把你舞台上的MC实例名放入数组，测试
var ballA:Array = [ball1, ball2, ball3, ball4, ball5];
//随机初始化每个MC的运动速度和方向
for (var i = 0; i<ballA.length; i++) {
ballA.dx = 11*rand1_1();
ballA.dy = 7*rand1_1();
}
//随机产生1或-1
function rand1_1():Number {
return random(2) ? -1 : 1;
}
Stage.scaleMode = "noScale";
Stage.align = "TL";
var sw:Number = Stage.width;
var sh:Number = Stage.height;
var stageListener:Object = new Object();
//舞台大小改变时，重置sw、sh
stageListener.onResize = function() {
sw = Stage.width;
sh = Stage.height;
};
Stage.addListener(stageListener);
onEnterFrame = function () {
for (var i = 0; i<ballA.length; i++) {
//检测所有MC之间是否有碰撞，有就根据情况改变“增量”方向
for (var j = i+1; j<ballA.length; j++) {
if (ballA.hitTest(ballA[j])) {
mc12(ballA, ballA[j]);
ballA._x += ballA.dx;
ballA[j]._x += ballA[j].dx;
ballA._y += ballA.dy;
ballA[j]._y += ballA[j].dy;
}
}
//如果到了边界，就反射
if ((ballA._x<ballA._width/2 && ballA.dx<0) or (ballA._x>sw-ballA._width/2 && ballA.dx>0)) {
ballA.dx *= -1;
}
if ((ballA._y<ballA._height/2 && ballA.dy<0) or (ballA._y>sh-ballA._height/2 && ballA.dy>0)) {
ballA.dy *= -1;
}
//移动一个“增量”
ballA._x += ballA.dx;
ballA._y += ballA.dy;
}
};
//碰撞函数，根据两球碰撞方向和自身运动方向合成新的增量值
function mc12(mc1:MovieClip, mc2:MovieClip) {
var ang:Number = Math.atan2(mc2._y-mc1._y, mc2._x-mc1._x);
var ang1:Number = Math.atan2(mc1.dy, mc1.dx);
var ang2:Number = Math.atan2(mc2.dy, mc2.dx);
var r1:Number = (mc1.dy/Math.sin(ang1))*Math.cos(ang-ang1);
var r2:Number = (mc2.dy/Math.sin(ang2))*Math.cos(ang-ang2);
var dx1:Number = r1*Math.cos(ang)+r2*Math.cos(ang);
var dy1:Number = r1*Math.sin(ang)+r2*Math.sin(ang);
mc1.dx = -mc1.dx+dx1;
mc1.dy = -mc1.dy+dy1;
mc2.dx = -mc2.dx+dx1;
mc2.dy = -mc2.dy+dy1;
}
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