class_docstr: A class for managing a circuit plot.
docstr: Draw a vertical control line.
docstr_tok: ["Draw","a","vertical","control","line","."]
code: def control_line(self, gate_idx, min_wire, max_wire):
      """Draw a vertical control line."""
      xdata = (self._gate_grid[gate_idx], self._gate_grid[gate_idx])
      ydata = (self._wire_grid[min_wire], self._wire_grid[max_wire])
      line = Line2D(xdata, ydata, color="k", lw=self.linewidth)
      self._axes.add_line(line)
  
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 13 for calling the CircuitPlot obj's underlying member method code with example usage: obj.control_line(gate_idx, min_wire, max_wire) without return types