Dijkstar 1.0

Dijkstra/A* path finding functions

Dijkstar is an implementation of Dijkstra’s single-source shortest-paths algorithm. If a destination node is given, the algorithm halts when that node is reached; otherwise it continues until paths from the source node to all other nodes are found.

Accepts an optional cost (or “weight”) function that will be called on every iteration.

Also accepts an optional heuristic function that is used to push the algorithm toward a destination instead of fanning out in every direction. Using such a heuristic function converts Dijkstra to A* (and this is where the name “Dijkstar” comes from).

Performance is decent on a graph with 100,000+ nodes. Runs in around .5 seconds on average .

See the source for the required graph structure:

https://bitbucket.org/wyatt/dijkstar/src/tip/dijkstar/__init__.py?at=Dijkstar#cl-36