code: def fillRect(self, x, y, w, h, color=None, aa=False):
          
          md.fill_rect(self.set, x, y, w, h, color, aa)
docs: Draw a solid rectangle with top-left corner at (x, y), width w and
          height h.
  
          :param aa: if True, use Bresenham's algorithm for line drawing;
              otherwise use Xiaolin Wu's algorithm