Is there a good graph layout library callable from C++?

The (directed) graphs represent finite automata. Up until now my test program has been writing out dot files for testing. This is pretty good both for regression testing (keep the verified output files in subversion, ask it if there has been a change) and for visualisation. However, there are some problems...

Basically, I want something callable from C++ and which plans a layout for my states and transitions but leaves the drawing to me - something that will allow me to draw things however I want and draw on GUI (wxWidgets) windows.

I also want a license which will allow commercial use - I don't need that at presen开发者_C百科t, and I may very well release as open source, but I don't want to limit my options ATM.

The problems with GraphViz are (1) the warnings about building from source on Windows, (2) all the unnecessary dependencies for rendering and parsing, and (3) the (presumed) lack of a documented API specifically and purely for layout.

Basically, I want to be able to specify my states (with bounding rectangle sizes) and transitions, and read out positions for the states and waypoints for each transition, then draw based on those co-ordinates myself. I haven't really figured out how annotations on transitions should be handled, but there should be some kind of provision for specifying bounding-box-sizes for those, associating them with transitions, and reading out positions.

Does anyone know of a library that can handle those requirements?

I'm not necessarily against implementing something for myself, but in this case I'd rather avoid it if possible.

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Hmm, GDToolkit (or GDT) looks okay: many of the images in the tutorial look pretty nice, and it doesn't look like it's terribly complicated to use.

Edit: But checking the license, it looks like it's commercial software :-(. Whoops!

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OGDF is under the GPL.

Pigale is also under the GPL.

GoVisual is commercial software, but it looks like it starts at $1800 for one developer.

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I was dealing with a similar problem earlier this year. One important input parameter for a decision however is the expected number of nodes.

I decided to use the Browser as the GUI and therefore looked for nice Javascript libraries, one i came across was wireit, it is very well suited for technical layouts (and also editing with drag and drop and "on the fly" layouting). You could easily connect that to your c++ by running a small webserver in a thread (You will need some kind of eventloop/thread thingie for GUI anyways).

Well just my 2 cents.

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Although the answers so far were worth an upvote, I can't really accept any of them. I've still been searching, though.

One thing I found is AGLO. The code is GPL v1, but there are papers that describe the algorithms, so it should be easy enough to re-implement from scratch if necessary.

There's also the paper by Gansner, Koutsofios, North and Vo - "A Technique for Drawing Directed Graphs" - available from here on the Graphviz site.

I've also been looking closely at the BSD-licensed (but Java) JGraph.

One way or the other, it looks like I might be re-implementing the wheel, if not actually re-inventing it.

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Here is a good collection of Graph Libs with comparison and searching functionality:
http://gvsr.polytech.univ-nantes.fr/GVSR/task?action=browse#

Maybe you find a lib which fits for you.