class_docstr: A class for managing a circuit plot.
docstr: Draw a control point.
docstr_tok: ["Draw","a","control","point","."]
code: def control_point(self, gate_idx, wire_idx):
      """Draw a control point."""
      x = self._gate_grid[gate_idx]
      y = self._wire_grid[wire_idx]
      radius = self.control_radius
      c = Circle(
          (x, y),
          radius * self.scale,
          ec="k",
          fc="k",
          fill=True,
          lw=self.linewidth,
      )
      self._axes.add_patch(c)
  
imports: from __future__ import annotations
  from sympy.core.mul import Mul
  from sympy.external import import_module
  from sympy.physics.quantum.gate import Gate, OneQubitGate, CGate, CGateS
label_desc: Use image node_id 14 for calling the CircuitPlot obj's underlying member method code with example usage: obj.control_point(gate_idx, wire_idx) without return types