在 pygraph 中设置图形属性

Question

我在documentation of pygraph 中找到了如何更改attributes of the nodes and the edges，但我没有找到有关如何更改图表属性的帮助。

我没有运气：

gr = graph()
gr.__setattr__('aspect',2)

你有什么推荐的？

谢谢！

[更新] 我也试过了：

gr = graph()
gr.__setattr__('rotate',90)
gr.rotate = 90
gr.color = 'red'
setattr(gr,'bgcolor','red')

[更新 2] 来自网站的示例代码，用于更改属性的不同想法：

#!/usr/bin/env python

# Copyright (c) 2007-2008 Pedro Matiello <pmatiello@gmail.com>
# License: MIT (see COPYING file)

# Import graphviz
import sys
sys.path.append('..')
sys.path.append('/usr/lib/graphviz/python/')
sys.path.append('/usr/lib64/graphviz/python/')
import gv

# Import pygraph
from pygraph.classes.graph import graph
from pygraph.classes.digraph import digraph
from pygraph.algorithms.searching import breadth_first_search
from pygraph.readwrite.dot import write

# Graph creation
gr = graph()

gr.__setattr__('rotate',90)
gr.rotate = 90
gr.color = 'red'
setattr(gr,'bgcolor','red')

# Add nodes and edges
gr.add_nodes(["Portugal","Spain","France","Germany","Belgium","Netherlands","Italy"])
gr.add_nodes(["Switzerland","Austria","Denmark","Poland","Czech Republic","Slovakia","Hungary"])
gr.add_nodes(["England","Ireland","Scotland","Wales"])

gr.add_edge(("Portugal", "Spain"))
gr.add_edge(("Spain","France"))
gr.add_edge(("France","Belgium"))
gr.add_edge(("France","Germany"))
gr.add_edge(("France","Italy"))
gr.add_edge(("Belgium","Netherlands"))
gr.add_edge(("Germany","Belgium"))
gr.add_edge(("Germany","Netherlands"))
gr.add_edge(("England","Wales"))
gr.add_edge(("England","Scotland"))
gr.add_edge(("Scotland","Wales"))
gr.add_edge(("Switzerland","Austria"))
gr.add_edge(("Switzerland","Germany"))
gr.add_edge(("Switzerland","France"))
gr.add_edge(("Switzerland","Italy"))
gr.add_edge(("Austria","Germany"))
gr.add_edge(("Austria","Italy"))
gr.add_edge(("Austria","Czech Republic"))
gr.add_edge(("Austria","Slovakia"))
gr.add_edge(("Austria","Hungary"))
gr.add_edge(("Denmark","Germany"))
gr.add_edge(("Poland","Czech Republic"))
gr.add_edge(("Poland","Slovakia"))
gr.add_edge(("Poland","Germany"))
gr.add_edge(("Czech Republic","Slovakia"))
gr.add_edge(("Czech Republic","Germany"))
gr.add_edge(("Slovakia","Hungary"))

# Draw as PNG
dot = write(gr)
gvv = gv.readstring(dot)
gv.layout(gvv,'dot')
gv.render(gvv,'png','europe.png')

Answer 1

显然您可以使用gv.setv() 在图表上设置属性。

import gv
g = gv.digraph('19261920')
gv.setv(g, 'overlap', 'compress')

我通过检查/usr/include/graphviz/gv.i 的gv.py 接口定义文件找到了gv.setv()

在 interwebz 上搜索 "import gv" overlap setv 将我带到 this old post，它演示了 gv.setv() 的使用。

我发现这个PDF gv_python man page 包含更多关于setv 的文档。

对于这么简单的事情来说，这是相当多的调查，嗯？

Answer 2

因此，我自己进行了更多研究，发现pygraphviz 提供了我需要的东西。这是使用pygraphviz 并接受属性的pygraph 示例。它也更短，因为如果所有节点都通过边连接，则不必指定节点。

#!/usr/bin/env python

# Copyright (c) 2007-2008 Pedro Matiello <pmatiello@gmail.com>
# License: MIT (see COPYING file)

# Import pygraphviz
import pygraphviz as pgv

# Graph creation and setting of attributes
gr = pgv.AGraph(rotate='90',bgcolor='lightgray')

# Add nodes and edges
gr.add_edge(("Portugal", "Spain"))
gr.add_edge(("Spain","France"))
gr.add_edge(("France","Belgium"))
gr.add_edge(("France","Germany"))
gr.add_edge(("France","Italy"))
gr.add_edge(("Belgium","Netherlands"))
gr.add_edge(("Germany","Belgium"))
gr.add_edge(("Germany","Netherlands"))
gr.add_edge(("England","Wales"))
gr.add_edge(("England","Scotland"))
gr.add_edge(("Scotland","Wales"))
gr.add_edge(("Switzerland","Austria"))
gr.add_edge(("Switzerland","Germany"))
gr.add_edge(("Switzerland","France"))
gr.add_edge(("Switzerland","Italy"))
gr.add_edge(("Austria","Germany"))
gr.add_edge(("Austria","Italy"))
gr.add_edge(("Austria","Czech Republic"))
gr.add_edge(("Austria","Slovakia"))
gr.add_edge(("Austria","Hungary"))
gr.add_edge(("Denmark","Germany"))
gr.add_edge(("Poland","Czech Republic"))
gr.add_edge(("Poland","Slovakia"))
gr.add_edge(("Poland","Germany"))
gr.add_edge(("Czech Republic","Slovakia"))
gr.add_edge(("Czech Republic","Germany"))
gr.add_edge(("Slovakia","Hungary"))

# Draw as PNG
gr.layout(prog='dot')
gr.draw('europe.png')

Answer 3

我不知道pygraph，但我认为你在python中设置属性的方式是：

setattr(object, attr, value)
setattr(gr, 'aspect', 2)

我的意思是，你尝试过 gr.aspect = 2，对吧？

Answer 4

试试下面的

import pydot

dot = write(gr)
dotG = pydot.graph_from_dot_data(dot)
params = { 'rotate': 10, 'color': 'red'}
dotG.set_graph_defaults(**params)
dot = dotG.to_string()