code: def get_tile_location(self, x, y):
          
          x1, y1 = self.origin
          x1 += self.BORDER + (self.BORDER + self.cell_width) * x
          y1 += self.BORDER + (self.BORDER + self.cell_height) * y
          return x1, y1
docs: Get the screen coordinate for the top-left corner of a tile.