pygraphviz 画图使用笔记

import pygraphviz as pgv

A=pgv.AGraph()

(x,y)=(0,0)
#增加四个点1 2 3 4
A.add_node(1)
A.add_node(2)
A.add_node(3)
A.add_node(4)

#指定四个点的坐标位置 注意 “！”
n=A.get_node(1)
n.attr['pos']="%d,%d!"%(x,y)
n=A.get_node(2)
n.attr['pos']="%d,%d!"%(x,-1*(y+1))
n=A.get_node(3)
n.attr['pos']="%d,%d!"%(x+1,y)
n=A.get_node(4)
n.attr['pos']="%d,%d!"%(x+1,-1*(y+1))

#增加三条边
A.add_edge(1,2)
A.add_edge(2,3)
A.add_edge(1,3)

A.write('simple.dot')  # write to simple.dot
A.layout()             # neato, node pos isnot available in dot
A.draw('simple.png')   # draw picture