code: def __draw_block(self, block, block_alpha=0.0):
          
          max_corner, min_corner = block.get_spatial_block().get_corners()
  
          face_color = matplotlib.colors.to_rgba('blue', alpha=block_alpha)
          edge_color = matplotlib.colors.to_rgba('black', alpha=1.0)
  
          rect = patches.Rectangle(min_corner, max_corner[0] - min_corner[0], max_corner[1] - min_corner[1],
                                   fill=True,
                                   facecolor=face_color,
                                   edgecolor=edge_color,
                                   linewidth=0.5)
          self.__ax.add_patch(rect)
docs: !
          @brief Display single BANG block on axis.
  
          @param[in] block (bang_block): BANG block that should be displayed.
          @param[in] block_alpha (double): Transparency level - value of alpha.