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* Previously graph layout was done using the Kamada-Kawai layout algorithm Tim Dwyer2006-07-121-196/+0
| | | | | | | | | | | | | | | | | implemented in Boost. I am replacing this with a custom implementation of a constrained stress-majorization algorithm. The stress-majorization algorithm is more robust and has better convergence characteristics than Kamada-Kawai, and also simple constraints can be placed on node position (for example, to enforce downward-pointing edges, non-overlap constraints, or cluster constraints). Another big advantage is that we no longer need Boost. I've tested the basic functionality, but I have yet to properly handle disconnected graphs or to properly scale the resulting layout. This commit also includes significant refactoring... the quadratic program solver - libvpsc (Variable Placement with Separation Constraints) has been moved to src/libvpsc and the actual graph layout algorithm is in libcola. (bzr r1394)
* Apparently a problem was reported with one of the test cases. Tim Dwyer2006-05-101-8/+7
| | | | | | | | I can't reproduce the problem, however solve_VPSC code in inkscape was getting quite out of date with that in www.sf.net/projects/adaptagrams. I've updated the code, which may fix the problem, or at least if it's reported again then I'll know it's still an issue. (bzr r803)
* Fixed bug to do with comparison of invalid constraints in pairing heaps.Tim Dwyer2006-01-261-1/+7
| | | | | Also numerical problem with constraint generation fixed. (bzr r30)
* Change to the way timestamps are used. Should now be more efficient.Tim Dwyer2006-01-251-1/+2
| | | (bzr r27)
* moving trunk for module inkscapeMenTaLguY2006-01-161-0/+190
(bzr r1)