def _draw_connector(self, canvas, point, enabled=True):
"""
|point|: a tuple of the form (x, y) indicating where the connecter should
be drawn.
|enabled|: allowed to start and end wires at the connector being created?
Draws and returns a connector for this Drawable at the indicated |point|.
"""
x, y = map(snap, point)
connector = Connector(create_connector(canvas, x, y, CONNECTOR_EMPTY_COLOR
if enabled else CONNECTOR_DISABLED_COLOR, CONNECTOR_EMPTY_OUTLINE if
enabled else CONNECTOR_DISABLED_OUTLINE, 2 if enabled else 1), (x, y),
self, enabled)
self.connectors.add(connector)
return connector
def redraw(self, canvas):
"""
Redraws this connector, most importantly to mark/color it connected or not
connected.
"""
canvas.delete(self.canvas_id)
x, y = self.center
# appropriately choose fill color
fill = ((CONNECTOR_FULL_COLOR if self.num_wires() else
CONNECTOR_EMPTY_COLOR) if self.enabled else CONNECTOR_DISABLED_COLOR)
outline = ((CONNECTOR_FULL_OUTLINE if self.num_wires() else
CONNECTOR_EMPTY_OUTLINE) if self.enabled else
CONNECTOR_DISABLED_OUTLINE)
active_width = 2 if self.enabled else 1
self.canvas_id = create_connector(canvas, x, y, fill, outline,
active_width)
