code: def plot(self, num_pts, color=None, alpha=None, ax=None):
          
          if self._dimension != 2:
              raise NotImplementedError(
                  "2D is the only supported dimension",
                  "Current dimension",
                  self._dimension,
              )
  
          s_vals = np.linspace(0.0, 1.0, num_pts)
          points = self.evaluate_multi(s_vals)
          if ax is None:
              ax = _plot_helpers.new_axis()
          ax.plot(points[0, :], points[1, :], color=color, alpha=alpha)
          return ax
docs: Plot the current curve.
  
          Args:
              num_pts (int): Number of points to plot.
              color (Optional[Tuple[float, float, float]]): Color as RGB profile.
              alpha (Optional[float]): The alpha channel for the color.
              ax (Optional[matplotlib.artist.Artist]): matplotlib axis object
                  to add plot to.
  
          Returns:
              matplotlib.artist.Artist: The axis containing the plot. This
              may be a newly created axis.
  
          Raises:
              NotImplementedError: If the curve's dimension is not ``2``.