Access is sporadic. Java not required. Source code is available. Motorcycle graphs by David Eppstein Joe Ganley 's Euclidean minimum spanning tree applet, with source code . Martin Hagerup's Travelling Salesman 2-OPT Heuristic for Dummies .
Source code is available.
Fred Henle 's point-line duality demo illustrates three different duality maps. 2d convex hulls and 3d clustering by Dorit Hochbaum , from the RIOT project at Berkeley. Used in his Java-illustrated version of Euclid's Elements . Information is currently available in German only. Realizing a Delaunay Triangulation by Tim Lambert is the exact opposite of a Delaunay triangulator.