![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
| author | tgdwyer <tgdwyer@users.sourceforge.net> | |
| Wed, 12 Jul 2006 00:55:58 +0000 (00:55 +0000) | ||
| committer | tgdwyer <tgdwyer@users.sourceforge.net> | |
| Wed, 12 Jul 2006 00:55:58 +0000 (00:55 +0000) | ||
| commit | 1ec681f88b68c6186b267afcce12c7fd667cc9f8 | |
| tree | 9748126a763c5a10b9ee25401cf2463a65a2aed6 | tree | snapshot |
| parent | 77acdd5becbb142a9b355e497575649abd758739 | commit | diff |
Previously graph layout was done using the Kamada-Kawai layout algorithm
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.
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.
66 files changed: