libvpsc is a cross-platform C++ library for solving for the Variable Placement with Separation Constraints problem. This is a quadratic programming problem in which the squared differences between a placement vector and some ideal placement are minimised subject to a set of separation constraints. This is very useful in a number of layout problems.
The API is documented using Doxygen. The documentation you are currently reading can be obtained by running doxygen in the cola directory.
The algorithms used for VPSC are described in the following papers. If you use libcola, please cite the relevant paper.