什么意思啊,,????????
// user transforms
if (pressv!=0) {
    this.panel+=pressv;
    pressv=pressv*.875;
    if ((pressv<.2) && (pressv>-.2)) {
        pressv=0;
    }
}
// 3d transforms
theta+=_parent.speed;
xbit=Math.sin(Math.PI/180 * theta);
ybit=Math.cos(Math.PI/180 * theta);
this._xscale=ybit*this.panel;
this._x=xbit*this.radius;
this._alpha=30+(ybit+1)*50;
this._yscale=this.panel-3+(ybit+1)*3;
stack=Math.round((ybit+1)*radius*2);
if (stack==100) {
    stack=101;
}
this.swapDepths(stack);