//初始化，创建数组
var N = 20;
var x = new Array();
var y = new Array();
//把鱼的各部分初始位置设置为（300，200）
for(var i = 0; i < N; i++)
{
x[i] = 300;
y[i] = 200;
}
//创建鱼相关的影片剪辑。
//使用this.attachMovie()来附加库中的影片，使用this.getNextHighestDepth()可以获得下一个更高的深度值。
//为了使鱼头覆盖鱼尾，按照序号从大到小的顺序生成。
//越靠近鱼尾，alpha值越小，缩放值也稍减小，从而获得头大尾小的效果。
for(i = N - 1; i >= 0; i--)
{
var mc:MovieClip;
if(i == 0)
mc = attachMovie("鱼头","fish_" + i, this.getNextHighestDepth());
else if(i == 5)
mc = attachMovie("鱼鳍","fish_" + i, this.getNextHighestDepth());
else
mc = attachMovie("鱼尾","fish_" + i, this.getNextHighestDepth());
mc._x=x[i];
mc._y=y[i];
mc._alpha=100*(1-i/N);
mc._xscale=mc._yscale=100-i*2;
fish[i]=mc;
}
var dest_x = _xmouse;
var dest_y = _ymouse;
var mouseListener = new Object();
mouseListener.onMouseMove = function(){
dest_x = _xmouse;
dest_y = _ymouse;
};
Mouse.addListener(mouseListener);
this.onEnterFrame = function(){
if(Math.abs(dest_x - x[0])<20 && Math.abs(dest_y - y[0])<20)
{
dest_x = _xmouse + Math.round(Math.random()*300-150);
dest_y = _ymouse + Math.round(Math.random()*200-100);
}
//更新位置坐标
x[0] += (dest_x - x[0])*0.1;
y[0] += (dest_y - y[0])*0.1;
for(var i=1;i<N;i++)
{
x[i] += (x[i-1]-x[i])/2;
y[i] += (y[i-1]-y[i])/2;
}
for(i=0;i<N;i++)
{
fish[i]._x=x[i];
fish[i]._y=y[i];
fish[i]._rotation = Math.atan2(y[i] - y[i-1],x[i] - x[i-1])*180/Math.PI;
}
fish[0]._rotation = fish[1]._rotation;
};
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