API for the technique described at Roberto Pinho and Maria Cristina Ferreira de Oliveira. 2009. HexBoard: Conveying Pairwise Similarity in an Incremental Visualization Space. In Proceedings of the 2009 13th International Conference Information Visualisation (IV '09). IEEE Computer Society, Washington, DC, USA, 32-37. DOI=10.1109/IV.2009.12 http://dx.doi.org/10.1109/IV.2009.12