//检测鼠标速度
var pre_x = _xmouse;
var pre_y = _ymouse;
var mouseSpeed = 0;
var mouse_angle = 0;
//检测鼠标开始
function caculateMouseSpeed() {
  var tempX = Math.pow(_xmouse-pre_x, 2);
  var tempY = Math.pow(_ymouse-pre_y, 2);
  var dist = Math.sqrt(tempX+tempY);
  //角度计算开始
  var y_mouse = Math.abs(_ymouse-pre_y);
  var x_mouse = Math.abs(_xmouse-pre_x);
  if (_ymouse>pre_y) {
    if (_xmouse>pre_x) {
      mouse_angle = Math.acos(x_mouse/dist)*180/Math.PI+90;
    }
    if (_xmouse == pre_x) {
      mouse_angle = 180;
    }
    if (_xmouse<pre_x) {
      mouse_angle = -(Math.atan(y_mouse/x_mouse)*180/Math.PI+90);
    }
  }
  if (_ymouse<pre_y) {
    if (_xmouse>pre_x) {
      mouse_angle = Math.asin(x_mouse/dist)*180/Math.PI;
    }
    if (_xmouse == pre_x) {
      mouse_angle = 0;
    }
    if (_xmouse<pre_x) {
      mouse_angle = -(Math.atan(x_mouse/y_mouse)*180/Math.PI);
    }
  }
  if (_ymouse == pre_y) {
    if (_xmouse>pre_x) {
      mouse_angle = 90;
    }
    if (_xmouse == pre_x) {
      mouse_angle = 0;
    }
    if (_xmouse<pre_x) {
      mouse_angle = -90;
    }
  }
  mo._rotation = mouse_angle;
  trace(mouse_angle);
  //角度计算结束
  mouseSpeed = dist/5;
  if (mouseSpeed>=300) {
    //最高限速
    mouseSpeed = 300;
  }
  mo._yscale=mouseSpeed;
  pre_x = _xmouse;
  pre_y = _ymouse;
}
setInterval(caculateMouseSpeed, 100);