code: function (event) {
                  var tile = this.refLayer.getTile(event.gameWorldX, event.gameWorldY);
                  if (tile && tile !== this.currentTile) {
                      // get the tile x/y world isometric coordinates
                      this.refLayer.getRenderer().tileToPixelCoords(tile.col, tile.row, this.diamondShape.pos);
                      // convert thhe diamon shape pos to floating coordinates
                      me.game.viewport.worldToLocal(
                          this.diamondShape.pos.x,
                          this.diamondShape.pos.y,
                          this.diamondShape.pos
                      );
                      // store the current tile
                      this.currentTile = tile;
                  };
              }
docs: pointer move event callback