code: function (x, y, v) {
              var tileX = Math.floor(x),
                  tileY = Math.floor(y);
              var ret = v || new me.Vector2d();
  
              if (this.staggerX) {
                  ret.y = tileY * (this.tileheight + this.sidelengthy);
                  if (this.doStaggerX(tileX)) {
                      ret.y += this.rowheight;
                  }
                  ret.x = tileX * this.columnwidth;
              } else {
                  ret.x = tileX * (this.tilewidth + this.sidelengthx);
                  if (this.doStaggerY(tileY)) {
                      ret.x += this.columnwidth;
                  }
                  ret.y = tileY * this.rowheight;
              }
  
              return ret;
          }
docs: return the pixel position corresponding of the specified tile
  @ignore