Flash AS制作小球自由运动和碰撞检测的动画

利用flash Actionscript对小球运动进行管理，并且实现对碰撞的检测的实例代码。

启动Flash 8，修改文档属性如下图。

接着建立影片剪辑，设置如下。

然后回到主场景中，在第一帧输入下面代码：

number_of_balls = 6;//可能会引起问题发生的！建议这里最大数为3。我提供的演示有问题了。
speed_limit = 10;//速度的设置。
for (x=1; x<=number_of_balls; x++) {
 ball = attachMovie("ball", "ball_"+x, _root.getNextHighestDepth(), {_x:Math.random()*400-50, _y:Math.random()*300-50});
 ball.collision = 0;
 ball.mass = 1;
 ball.xspeed = Math.random()*8-4;
 ball.yspeed = Math.random()*8-4;
 ball.onEnterFrame = function() {
  if (this._x<15) {
   this._x = 15;
   this.xspeed *= -1;
  }
  else if (this._x>485) {
   this._x = 485;
   this.xspeed *= -1;
  }
  if (this._y<15) {
   this._y = 15;
   this.yspeed *= -1;
  }
  else if (this._y>385) {
   this._y = 385;
   this.yspeed *= -1;
  }
  if (this.xspeed>speed_limit) {
   this.xspeed = speed_limit;
  }
  if (this.xspeed<speed_limit*-1) {
   this.xspeed = speed_limit*-1;
  }
  if (this.yspeed>speed_limit) {
   this.yspeed = speed_limit;
  }
  if (this.yspeed<speed_limit*-1) {
   this.yspeed = speed_limit*-1;
  }
  this._x += this.xspeed;
  this._y += this.yspeed;
 };
}
function manage_bounce(ball, ball2) {
 dx = ball._x-ball2._x;
 dy = ball._y-ball2._y;
 collisionision_angle = Math.atan2(dy, dx);
 magnitude_1 = Math.sqrt(ball.xspeed*ball.xspeed+ball.yspeed*ball.yspeed);
 magnitude_2 = Math.sqrt(ball2.xspeed*ball2.xspeed+ball2.yspeed*ball2.yspeed);
 direction_1 = Math.atan2(ball.yspeed, ball.xspeed);
 direction_2 = Math.atan2(ball2.yspeed, ball2.xspeed);
 new_xspeed_1 = magnitude_1*Math.cos(direction_1-collisionision_angle);
 new_yspeed_1 = magnitude_1*Math.sin(direction_1-collisionision_angle);

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