code: def _draw_lines_internal(self, coords, colour, bg):
          
          for i, (x, y) in enumerate(coords):
              if i == 0:
                  self._screen.move(x, y)
              else:
                  self._screen.draw(x, y, colour=colour, bg=bg, thin=True)
docs: Helper to draw lines connecting a set of nodes that are scaled for the Screen.