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。

我没有运气试过：

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

你推荐什么？

谢谢！

[更新] 我也尝试过：

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，具有不同的想法来更改属性：

#!/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gv.setv()

上的gv.py接口定义文件找到了/usr/include/graphviz/gv.i

在interwebz中搜索"import gv" overlap setv，让我看到this old post，演示了gv.setv()的使用情况。

我发现此PDF gv_python man page包含有关setv的更多文档。

对于这么简单的事情，这是一个很大的调查，嗯？

Answer 2

所以，我自己做了更多研究，发现pygraphviz正在提供我需要的东西。以下是使用pygraph并接受属性的pygraphviz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，你试过gr.aspect = 2，对吧？

Answer 4

尝试以下

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()

在pygraph中设置图形属性

4 个答案: