FairyGUI.GRoot.GetPoupPosition C# (CSharp) Method

        public Vector2 GetPoupPosition(GObject popup, GObject target, object downward)
        {
            Vector2 pos;
            Vector2 size = Vector2.zero;
            if (target != null)
            {
                pos = target.LocalToRoot(Vector2.zero, this);
                size = target.LocalToRoot(target.size, this) - pos;
            }
            else
            {
                pos = this.GlobalToLocal(Stage.inst.touchPosition);
            }
            float xx, yy;
            xx = pos.x;
            if (xx + popup.width > this.width)
                xx = xx + size.x - popup.width;
            yy = pos.y + size.y;
            if ((downward == null && yy + popup.height > this.height)
                || downward != null && (bool)downward == false)
            {
                yy = pos.y - popup.height - 1;
                if (yy < 0)
                {
                    yy = 0;
                    xx += size.x / 2;
                }
            }

            return new Vector2(Mathf.RoundToInt(xx), Mathf.RoundToInt(yy));
        }

 static int GetPoupPosition(IntPtr L)
 {
     try
     {
         ToLua.CheckArgsCount(L, 4);
         FairyGUI.GRoot      obj  = (FairyGUI.GRoot)ToLua.CheckObject(L, 1, typeof(FairyGUI.GRoot));
         FairyGUI.GObject    arg0 = (FairyGUI.GObject)ToLua.CheckObject(L, 2, typeof(FairyGUI.GObject));
         FairyGUI.GObject    arg1 = (FairyGUI.GObject)ToLua.CheckObject(L, 3, typeof(FairyGUI.GObject));
         object              arg2 = ToLua.ToVarObject(L, 4);
         UnityEngine.Vector2 o    = obj.GetPoupPosition(arg0, arg1, arg2);
         ToLua.Push(L, o);
         return(1);
     }
     catch (Exception e)
     {
         return(LuaDLL.toluaL_exception(L, e));
     }
 }