* Computes the Delaunay triangulation of the initial sites.
*/
public void formInitialDelaunay() {
computeBoundingBox();
subdiv = new QuadEdgeSubdivision(computeAreaEnv, tolerance);
subdiv.setLocator(new LastFoundQuadEdgeLocator(subdiv));
incDel = new IncrementalDelaunayTriangulator(subdiv);
insertSites(initialVertices);
}