Flex 窗体居中

 /**
   * 窗体居中XY坐标
   * */
  public static function getCenter(winWidth:Number,winHeight:Number):Array{
      var appWidth:Number = FlexGlobals.topLevelApplication.getVisibleRect().width;
      var appHeight:Number = FlexGlobals.topLevelApplication.getVisibleRect().height;
      var arr:Array = new Array();
      arr.push(Math.max(0,(appWidth - winWidth) / 2));  //X
      arr.push(Math.max(0,(appHeight - winHeight) / 2));//Y
      return arr;
  }