def clicky(node):
    """sets the origin and endpoint nodes"""

    global origin, endpoint, finished

    if origin == 0:
        origin = node
        node.highlight(color = Color.RED, size = node.size()*1.5)
        node.set_color(color = Color.RED)
        node.set_label('origin', label_id = 1).set_size(size = 15)
        node.set_label(0, label_id = 0)
        print('origin: ' + str(origin.id()))

    elif endpoint == 0:
        endpoint = node
        node.highlight(color = Color.RED, size = node.size()*1.5)
        node.set_color(color = Color.RED)
        node.set_label('target', label_id = 1).set_size(size = 15)
        print('target: ' + str(endpoint.id()))

        print(bfs())