docs: def _draw_rectangle(context, width, height):
          """Draw a rectangle
  
          Assertion: The current point is the center point of the rectangle
  
          :param context: Cairo context
          :param width: Width of the rectangle
          :param height: Height of the rectangle
          """
          c = context
          # First move to upper left corner
          c.rel_move_to(-width / 2., -height / 2.)
          # Draw closed rectangle
          c.rel_line_to(width, 0)
          c.rel_line_to(0, height)
          c.rel_line_to(-width, 0)
          c.close_path()