code: def _on_calculate_cverts(self):
      if not self.verts or not self.color:
          return
  
      def set_work_len(n):
          self._calculating_cverts_len = float(n)
  
      def inc_work_pos():
          self._calculating_cverts_pos += 1.0
  
      set_work_len(1)
      self._calculating_cverts_pos = 0
      self.cverts = self.color.apply_to_curve(
          self.verts,
          self.t_set,
          set_len=set_work_len,
          inc_pos=inc_work_pos,
      )
      self.push_wireframe(self.draw_verts(True))
  
file_path: sympy/sympy/plotting/pygletplot/plot_curve.py
imports: import pyglet.gl
  from sympy.core import S
  from sympy.plotting.pygletplot.plot_mode_base import PlotModeBase
label_desc: Use image node_id 2 for calling the PlotCurve obj's underlying member method code with example usage: obj._on_calculate_cverts() without return types