code: def createCenterPointMarker(self):
          '''Creates the center pointer in the middle of the screen.'''
          self.axes.add_patch(patches.Rectangle((-0.75,-self.thick),0.5,2.0*self.thick,facecolor='orange',zorder=3))
          self.axes.add_patch(patches.Rectangle((0.25,-self.thick),0.5,2.0*self.thick,facecolor='orange',zorder=3))
          self.axes.add_patch(patches.Circle((0,0),radius=self.thick,facecolor='orange',edgecolor='none',zorder=3)f createCenterPointMarker(self):
          '''Creates the center pointer in the middle of the screen.'''
          self.axes.add_patch(patches.Rectangle((-0.75,-self.thick),0.5,2.0*self.thick,facecolor='orange',zorder=3))
          self.axes.add_patch(patches.Rectangle((0.25,-self.thick),0.5,2.0*self.thick,facecolor='orange',zorder=3))
          self.axes.add_patch(patches.Circle((0,0),radius=self.thick,facecolor='orange',edgecolor='none',zorder=3))
docs: Creates the center pointer in the middle of the screen.