LaTex formulas in python API

1

Dear Graphviz community,

Is there a way to include latex formulas as labels in the Python API of Graphviz?

I have looked at the examples: Examples — graphviz 0.20.1 documentation, but there is nothing similar to include formulas.

A minimal example is appreciated.

Thanks.

2

I’m a little unsure what you’re asking. Are you trying to render some mathematical formula, into the labels(?) of a graphviz diagram, using the LaTeX language for writing formulae? There are some systems that can do things like that for PDF that academics use I think. Are you trying to make, like, a PDF for an academic paper?

3

Thanks for your reply.

Are you trying to render some mathematical formula into the labels(?)

Yes, I am using this API Graphviz — graphviz 0.20.1 documentation, in which I can render graphs from python. However, in the given examples, there is no info about it.

4

Unfortunately, Graphviz does not directly take Latex as input nor does it produce Latex as output.
However,

  • You can produce a non-Latex output (SVG)
    • by using Latex, TikZ or similar to create the individual nodes separately
    • producing those individual images as SVG
    • and using the image attribute (image | Graphviz) in your Graphviz (see below)
  • You can also look into these Latex-related tools from others: External Resources | Graphviz - especially if you need Latex or TikZ as your output format

Here is a non-python Graphviz program that uses SVG icons as node contents using the image attribute:

digraph G {
 graph [rankdir=LR]
 node [shape=none label=""]
 n1  [ image="image_dir/Router.svg" ]
 n2  [ image="image_dir/Router.svg" ]
 n4  [ image="image_dir/Face-smile.svg" ]
 n5  [ image="image_dir/a.svg"]
 n6  [ image="image_dir/a.svg" ]

 n1 -> n2 -> n4 -> n5 -> n6
}
5

@sebas-a, where you able to find a way to do this? I am also wanting to be able to use LaTeX interpreter as for the label of my nodes; essentially to display equations.

6

Can’t speak to doing this in Python, but here are some LaTex images that I picked up here & there and incorporated into nodes with the image attribute (image | Graphviz):

digraph G {
 graph [rankdir=LR]
 node [shape=none label=""]
 node [imagescale=true]
 n1  [ image="image_dir/LaTeX-arrow.png" ]
 n2  [ image="image_dir/longeqns2.png" ]
 n3  [ image="image_dir/Eggequation.jpg" ]
 n4  [ shape=rect image="image_dir/LaTeX-arrow.png" ]
 n5  [ shape=circle image="image_dir/main-qimg.png"]
 n6  [ shape=rect image="image_dir/LaTeX-arrow.png" ]

 n1 -> { n2 n3}
 n2-> n4 -> n5 -> n6

subgraph clusterX {
 node [imagescale=true]
 J1  [ image="image_dir/LaTeX-arrow.png" ]
 J2  [ shape=rect image="image_dir/longeqns2.png" ]
 J4  [ image="image_dir/LaTeX-arrow.png" ]
 J5  [ shape=rect image="image_dir/main-qimg.png"]
 J6  [ shape=circle image="image_dir/LaTeX-arrow.png" ]
}
 J1 -> J2
 J1-> J6 -> J5 -> J4
}

Giving:

latexImages
latexImages2972×1545 237 KB