仿屏保的折线曲线运动效果

新建一ＭＣ元件，在ＭＣ的时间轴上写入下面的代码：

this._x = this._y = 0;
total = 5;
myColor = random(0xffffff);
speed = 5;
for (i = 0; i < total; i++) {
createEmptyMovieClip("mc" + i, i);
this["mc" + i]._y = random(Stage.height);
this["mc" + i]._x = random(Stage.width);
this["mc" + i].xsp = random(speed) + 5;
this["mc" + i].ysp = random(speed) + 5;
}
onEnterFrame = function () {
r = Math.floor(random(5));
g = Math.floor(random(10));
b = Math.floor(random(20));
//myColor += r << 32 + g << 16 + b;
//myColor &= 0xffffff;
for (i = 0; i < total; i++) {
  with (this["mc" + i]) {
   _x = _x + xsp;
   _y = _y + ysp;
   if (_x > Stage.width || _x < 0) {
    xsp = -xsp;
    myColor += r << 32 + g << 16 + b;
    myColor &= 0xffffff;
   }
   if (_y > Stage.height || _y < 0) {
    ysp = -ysp;
    myColor += r << 32 + g << 16 + b;
    myColor &= 0xffffff;
   }
  }
}
createEmptyMovieClip("xian", 100);
with (xian) {
  lineStyle(2, myColor, 100);
  start_pt_x = (mc0._x + this["mc" + (total - 1)]._x) / 2;
  start_pt_y = (mc0._y + this["mc" + (total - 1)]._y) / 2;
  moveTo(start_pt_x, start_pt_y);
  for (i = 0; i < total - 1; i++) {
   ctl_pt_x = this["mc" + i]._x;
   ctl_pt_y = this["mc" + i]._y;
   end_pt_x = (this["mc" + (i + 1)]._x + this["mc" + i]._x) / 2;
   end_pt_y = (this["mc" + (i + 1)]._y + this["mc" + i]._y) / 2;
   curveTo(ctl_pt_x, ctl_pt_y, end_pt_x, end_pt_y);
  }
  ctl_pt_x = this["mc" + (total - 1)]._x;
  ctl_pt_y = this["mc" + (total - 1)]._y;
  end_pt_x = (this["mc0"]._x + this["mc" + (total - 1)]._x) / 2;
  end_pt_y = (this["mc0"]._y + this["mc" + (total - 1)]._y) / 2;
  curveTo(ctl_pt_x, ctl_pt_y, end_pt_x, end_pt_y);
}
};

在主场景中拖入三个该元件，效果如下：
/Upload/2006-07/3_131.swf
绘制折线的代码如下：

this._x = this._y = 0;
total = 6;
myColor = random(0xffffff);
speed = 5;
for (i = 0; i < total; i++) {
createEmptyMovieClip("mc" + i, i);
this["mc" + i]._y = random(Stage.height);
this["mc" + i]._x = random(Stage.width);
this["mc" + i].xsp = random(speed) + 5;
this["mc" + i].ysp = random(speed) + 5;
}
onEnterFrame = function () {
r = Math.floor(random(5));
g = Math.floor(random(10));
b = Math.floor(random(20));
//myColor += r << 32 + g << 16 + b;
//myColor &= 0xffffff;
for (i = 0; i < total; i++) {
  with (this["mc" + i]) {
   _x = _x + xsp;
   _y = _y + ysp;
   if (_x > Stage.width || _x < 0) {
    xsp = -xsp;
    myColor += r << 32 + g << 16 + b;
    myColor &= 0xffffff;
   }
   if (_y > Stage.height || _y < 0) {
    ysp = -ysp;
    myColor += r << 32 + g << 16 + b;
    myColor &= 0xffffff;
   }
  }
}
createEmptyMovieClip("xian", 100);
with (xian) {
  lineStyle(2, myColor, 100);
  moveTo(mc0._x, mc0._y);
  for (i = 0; i < total -1 ; i++) {
   lineTo(this["mc" + i]._x, this["mc" + i]._y);
  }
  lineTo(mc0._x, mc0._y);
}
};

效果如下：

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