Doxygen fails to use Graphviz to generate dependency graph

Question

I am trying to use Doxygen to generate the documentation of my c++ program, and I wish to have the dependency graph as well. So I installed graphviz-2.40.1, the path to graphviz is shown below:

which dot
/usr/local/bin/dot

I turned on the HAVE_DOT to YES, and also set the DOT_PATH to be /usr/local/bin/.

However if I run doxygen, it fails to generate the dependency graph and throws me the error:

Format: "png" not recognized. Use one of: canon cmap cmapx cmapx_np dot dot_json eps fig gv imap imap_np ismap json json0 mp pic plain plain-ext pov ps ps2 svg svgz tk vml vmlz xdot xdot1.2 xdot1.4 xdot_json
error: Problems running dot: exit code=1, command='/usr/local/bin/dot', arguments='"/home/shiqihe/Documents/code/cpp/docs/doxygen/html/dg__main_8cpp__incl.dot" -Tpng -o "/home/shiqihe/Documents/code/cpp/docs/doxygen/html/dg__main_8cpp__incl.png"'

I have searched for the solution and find this: soluiton

I tried sudo dot -c but it did not work. Still gave me the same error.

Any help? Thank you!

Which platform are you using? Which version of doxygen? – albert Dec 22 '19 at 17:13 — albert, Dec 22 '19 at 17:13
I am using doxygen-1.8.13, on ubuntu 18.04.3 – Shiqi He Dec 22 '19 at 19:02 — Shiqi He, Dec 22 '19 at 19:02

score 0 · Accepted Answer · answered Dec 22 '19 at 17:17

You already mentioned the "solution" which says:

It looks like there is a bug in the official install. After running the command 'dot -c', the problem has been solved.

The version you use does not support png, so:

search for an executable that contains the png format
create an executable yourself based on the graphviz dot code
use another format in doxygen (when you use HTML as output you can use e,g. svg as DOT_IMAGE_FORMAT. (see documentation in e.g. http://doxygen.nl/manual/customize.html#minor_tweaks_dynsection)

Thank you, problem solved! I changed `DOT_IMAGE_FORMAT = ` form `png` to `svg`, then everything works just fine. And for HTML if the browser is IE +9, you need to set `HTML_FILE_EXTENSION` to `xhtml`. — Shiqi He, Dec 22 '19 at 19:00

Doxygen fails to use Graphviz to generate dependency graph

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