def switch_on_off(self, obj, trait_name, old, new):
if not self.signal._plot.is_active(): return
if new is True and old is False:
self._line = DraggableVerticalLine(self.axes_manager)
self._line.add_axes(self.signal._plot.signal_plot.ax)
self._line.patch.set_linewidth(2)
self._color_changed("black", "black")
# There is not need to call draw because setting the
# color calls it.
elif new is False and old is True:
self._line.close()
self._line = None
self.draw()
