使用 Matplotlib 绘制 NetworkX 图形时如何修复图形被切断的问题？

Question

我正在使用 NetworkX 和 Matplotlib 绘制节点，但节点有时会在图形边缘被切断。是否有设置可以增加边距或防止它们被切断？

图片：Nodes being cut off at the edge of the graphic

示例程序：

import networkx as nx
import matplotlib.pyplot as plt
import numpy as np

adjacency_matrix = np.array([[1,0,0,0,0,0,1,0],[0,1,1,1,1,0,0,0],[0,1,1,0,0,0,0,0],[0,1,0,1,0,0,0,0],
    [0,1,0,0,1,1,0,0],[0,0,0,0,1,1,1,1],[1,0,0,0,0,1,1,0],[0,0,0,0,0,1,0,1]])

nx_graph = nx.from_numpy_matrix(adjacency_matrix)
pos = nx.networkx.kamada_kawai_layout(nx_graph)

nx.draw_networkx_nodes(nx_graph, pos, node_color="#000000", node_size=10000)

nx.draw_networkx_edges(nx_graph, pos, color="#808080", alpha=0.2, width=2.0)

plt.axis('off')
plt.tight_layout()
plt.show()

Answer 1

您可以缩放轴以避免节点被切断

import networkx as nx
import matplotlib.pyplot as plt
import numpy as np

adjacency_matrix = np.array([[1,0,0,0,0,0,1,0],[0,1,1,1,1,0,0,0],[0,1,1,0,0,0,0,0],[0,1,0,1,0,0,0,0],
    [0,1,0,0,1,1,0,0],[0,0,0,0,1,1,1,1],[1,0,0,0,0,1,1,0],[0,0,0,0,0,1,0,1]])

nx_graph = nx.from_numpy_matrix(adjacency_matrix)
pos = nx.networkx.kamada_kawai_layout(nx_graph)

nx.draw_networkx_nodes(nx_graph, pos, node_color="#000000", node_size=10000)

nx.draw_networkx_edges(nx_graph, pos, color="#808080", alpha=0.2, width=2.0)

plt.axis('off')
axis = plt.gca()
axis.set_xlim([1.2*x for x in axis.get_xlim()])
axis.set_ylim([1.2*y for y in axis.get_ylim()])
plt.tight_layout()
plt.show()

根据您的节点大小，您可能需要改变因子 (1.2)。在您给定的示例中，此值有效。更多信息请参阅我对related question 的回答。