'Pygraphviz: specify dot renderer


I'm trying to render a graph as a SVG. The problem is with PyGraphviz, but I made a dot file to debug/make it easier to share. Note that my label contains text in bold so I have to use HTML-like labels, the table is not mandatory but this is what I read I should use when I searched through similar problems in SO. 
digraph test {
    node [shape=plain];
    n1 [label=< 
    <table border="1" cellborder="0" cellspacing="0">
        <tr><td align="center"><b>Not centered when using default renderer for SVG</b></td></tr>
        <tr><td align="text">Lorem ipsum</td></tr>
    </table> >];
}

The graphviz documentation specifies that "In addition, all of these markups are currently only available via the cairo and svg renderers."

Indeed, when I render via the command line with dot -Tsvg ./test.dot -o test1.svg, I get a wrong result with the text not centered in the node. Whereas when I specify the renderer dot -Tsvg:svg ./test.dot -o test2.svg, everything works well.

Now the problem is that calling G.draw('test3.svg', prog='dot') probably calls the first command, which produces the wrongly aligned result.
I tried to specify the renderer with G.draw('test4.svg', prog='dot', args='-Tsvg:svg') or G.draw('test5.svg', prog='dot', format='svg:svg') but in both cases the produced svg is invalid (there's two <?xml ...> tags for some reason).

So is there a way to specify the renderer via pygraphviz? Or should I dump the graph in a .dot file and call dot with subprocess.run and the correct arguments?

Thanks

graphvizpygraphviz


Solution 1:[1]

After checking PyGraphviz's source code, I managed to make it work with G.draw("test.svg", prog= 'dot', format='svg:cairo').

The format argument is deduced from the filename when it's not provided which caused Dot to output the graph twice in the same SVG file.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 ToufiPF

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