我想创建一个图形并绘制它,到目前为止一直很好,但问题是我想在每个节点上绘制更多信息。 我看到我可以将属性保存到nodes \ edges,但是我如何绘制属性? 我正在使用PyGraphviz女巫使用Graphviz。
答案 0 :(得分:3)
一个例子是
import pygraphviz as pgv
from pygraphviz import *
G=pgv.AGraph()
ndlist = [1,2,3]
for node in ndlist:
label = "Label #" + str(node)
G.add_node(node, label=label)
G.layout()
G.draw('example.png', format='png')
答案 1 :(得分:2)
您只能将supported attributes添加到节点和边缘。这些属性对GrpahViz具有特定含义。
要显示有关边或节点的额外信息,请使用label
属性。
答案 2 :(得分:-1)
如果你已经有一个带有你想要标记的属性的图表,你可以使用这个:
def draw_nx_with_pygraphviz_attribtes_as_labels(g, attribute_name, path2file=None):
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
# https://stackoverflow.com/questions/15345192/draw-more-information-on-graph-nodes-using-pygraphviz
if path2file is None:
path2file = './example.png'
path2file = Path(path2file).expanduser()
g = nx.nx_agraph.to_agraph(g)
# to label in pygrapviz make sure to have the AGraph obj have the label attribute set on the nodes
g = str(g)
g = g.replace(attribute_name, 'label') # it only
print(g)
g = pgv.AGraph(g)
g.layout()
g.draw(path2file)
# https://stackoverflow.com/questions/20597088/display-a-png-image-from-python-on-mint-15-linux
img = mpimg.imread(path2file)
plt.imshow(img)
plt.show()
# remove file https://stackoverflow.com/questions/6996603/how-to-delete-a-file-or-folder
path2file.unlink()
# -- tests
def test_draw():
# import pylab
import networkx as nx
g = nx.Graph()
g.add_node('Golf', size='small')
g.add_node('Hummer', size='huge')
g.add_node('Soccer', size='huge')
g.add_edge('Golf', 'Hummer')
draw_nx_with_pygraphviz_attribtes_as_labels(g, attribute_name='size')
if __name__ == '__main__':
test_draw()
结果:
特别注意,这两个巨大的并没有成为一个自循环,它们是两个不同的节点(例如,两个运动可以是巨大的,但它们不是同一个运动/实体)。
相关但与 nx 绘图:Plotting networkx graph with node labels defaulting to node name