flash 多个小球进行碰撞检测

整个的代码如下:

m._visible = 0;

function setMc(m_width,w,h,speed) {
stage_w = w-m_width;
stage_h = h-m_width;
for (i=1; i<11; i++) {
M = m.duplicateMovieClip("m"+i, i);
M_x = m_width/2+random(stage_w);
M_y = m_width/2+random(stage_h);
if (i == 1) {
M._x = M_x;
M._y = M_y;
}
if (i>1) {
for (j=1; j<i; j++) {
if (Math.sqrt((this["m"+j]._x-M_x)*(this["m"+j]._x-M_x)+(this["m"+j]._y-M_y)*(this["m"+j]._y-M_y))<m_width) {
i--;
break;
}
}
if (j == i) {
M._x = M_x;
M._y = M_y;
}
}
//以上这些是做小球在一定范围内不重合的随机排列
M.rotation = random(2*Math.PI);
M.xspeed = speed;
M.yspeed = speed;
//初始每个小球的速度,角度
M.onEnterFrame = function() {
this._x += this.xspeed*Math.cos(this.rotation);
this._y += this.yspeed*Math.sin(this.rotation);
//--------------
for (i=1; i<11; i++) {
if (i == this._name.substr(1, this._name.length)) {
continue;
} else if (Math.sqrt((this._y-_root["m"+i]._y)*(this._y-_root["m"+i]._y)+(this._x-_root["m"+i]._x)*(this._x-_root["m"+i]._x))<=m_width) {
this.rotation = Math.atan2(this._y-_root["m"+i]._y, this._x-_root["m"+i]._x);
this.xspeed = speed;
this.yspeed = speed;
this._x += this.xspeed*Math.cos(this.rotation);
this._y += this.yspeed*Math.sin(this.rotation);
break;
}
//每个小球对场景内的其他所有小球进行接触判断,这里的接触用的是距离判断
}
//---------------
if (this._x<=m_width/2) {
this._x = m_width/2+.1;
this.xspeed *= -1;
} else if (this._x>=300-m_width/2) {
this._x = 300-m_width/2-.1;
this.xspeed *= -1;
} else if (this._y<=m_width/2) {
this._y = m_width/2+.1;
this.yspeed *= -1;
} else if (this._y>=300-m_width/2) {
this._y = 300-m_width/2-.1;
//这里-.1的处理是为了防止了边界出现问题,你可以删掉这句看看,原因还是自己动脑想
this.yspeed *= -1; }
};
//这里是对小球碰到边界的判断
}
}
setMc(m._width,300,300,5);//参数分别是小球的宽度,

补充：flash教程,Action