code: def coordinates(self):
          
  
          angles = self.values[0]
          radii = self.values[1]
          x = np.zeros(len(angles))
          y = np.zeros(len(angles))
  
          for i in range(len(x)):
              x[i] = (radii[i] * np.cos(angles[i] + self.geometry.pa) +
                      self.geometry.x0)
  
              y[i] = (radii[i] * np.sin(angles[i] + self.geometry.pa) +
                      self.geometry.y0)
  
          return x, y
docs: Return the (x, y) coordinates associated with each sampled
          point.
  
          Returns
          -------
          x, y : 1D `~numpy.ndarray`
              The x and y coordinate arrays.