FLASH中蝴蝶如何制造?要动态

在需要的帧里插入：
蝴蝶的颤翅自己设计
probability = 100;

scene_width = 500;
scene_height = 290;
speed = 0.03;
depth = 15;
MovieClip.prototype.smoothMove = function (speed, targetx, targety) {
this._x += speed*(targetx-this._x);
this._y += speed*(targety-this._y);
};
MovieClip.prototype.rotateTo = function (targetx, targety) {
var diffX = targetx-this._x;
var diffY = targety-this._y;
this._rotation = Math.atan2 (diffY, diffX)*180/Math.PI;
};
_root.transp0.onEnterFrame = function () {
if (random (probability) == 1) {
target0X = random (scene_width);
target0Y = random (scene_height);
}
this._visible = 0;
this.smoothMove (speed, target0X, target0Y);
};
_root.transp1.onEnterFrame = function () {
if (random (probability) == 1) {
target1X = random (scene_width);
target1Y = random (scene_height);
}
this._visible = 0;
this.smoothMove (