如何使用鼠标手动放置networkx节点？

import networkx as nx
import matplotlib.pyplot as plt

G = nx.Graph()

G.add_node('Node 1')
G.add_node('Node 2')
G.add_node('Node 3')

pos = {}  # 用于存储节点位置的字典

def on_click(event):
    if event.button == 1:  # 左键点击
        x, y = event.xdata, event.ydata
        node_name = 'Node ' + str(len(G.nodes) + 1)  # 自动生成节点名称
        G.add_node(node_name)
        pos[node_name] = (x, y)
        nx.draw_networkx_nodes(G, pos, node_size=200, node_color='blue')
        nx.draw_networkx_edges(G, pos)
        nx.draw_networkx_labels(G, pos)
        plt.draw()

fig = plt.figure()
fig.canvas.mpl_connect('button_press_event', on_click)

nx.draw_networkx(G, pos, node_size=200, node_color='blue')
plt.axis('off')
plt.show()