From 12b21e1d27f43deaa748419919b40b80cedd0ddd Mon Sep 17 00:00:00 2001 From: Tim Dwyer Date: Wed, 12 Jul 2006 00:55:58 +0000 Subject: 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. (bzr r1394) --- src/libvpsc/variable.cpp | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 src/libvpsc/variable.cpp (limited to 'src/libvpsc/variable.cpp') diff --git a/src/libvpsc/variable.cpp b/src/libvpsc/variable.cpp new file mode 100644 index 000000000..1890f788e --- /dev/null +++ b/src/libvpsc/variable.cpp @@ -0,0 +1,15 @@ +/** + * + * Authors: + * Tim Dwyer + * + * Copyright (C) 2005 Authors + * + * Released under GNU LGPL. Read the file 'COPYING' for more information. + */ +#include "variable.h" +std::ostream& operator <<(std::ostream &os, const Variable &v) { + os << "(" << v.id << "=" << v.position() << ")"; + return os; +} + -- cgit v1.2.3