code: def plot_discrete(self, show=False, annotations=True):
          
          import matplotlib.pyplot as plt
          axis = plt.axes()
          axis.set_aspect('equal', 'datalim')
  
          for i, points in enumerate(self.discrete):
              color = ['g', 'k'][i in self.root]
              axis.plot(*points.T, color=color)
  
          if annotations:
              for e in self.entities:
                  if not hasattr(e, 'plot'):
                      continue
                  e.plot(self.vertices)
  
          if show:
              plt.show()
          return axis
docs: Plot the closed curves of the path.