code: def draw_image(self, image, xmin=0, ymin=0, xmax=None, ymax=None):
          if xmax is None:
              xmax = xmin + image.size[0]
          if ymax is None:
              ymax = ymin + image.size[1]
          self.bitmap_list.append({'image': image,
                                   'xmin': xmin,
                                   'xmax': xmax,
                                   'ymin': ymin,
                                   'ymax': ymax})
          xmin = min(x for x in (xmin, self.limits['xmin'])
                     if x is not None)
          ymin = min(y for y in (ymin, self.limits['ymin'])
                     if y is not None)
          xmax = max(x for x in (xmax, self.limits['xmax'])
                     if x is not None)
          ymax = max(y for y in (ymax, self.limits['ymax'])
                     if y is not None)
          self.set_xlimits(xmin, xmax)
          self.set_ylimits(ymin, ymax)