@hackage planar-graph1.0.0.0

Planar graphs are graphs that can be embedded onto a surface (i.e. they can be drawn on that surface without any edges crossing). As such, it is preferable to use a dedicated data structure for them that has information about how to achieve this embedding rather than a standard graph data structure.

(Please note however that this implementation has only been tested in terms of the embedding being on the unit sphere or disc; whether it works or not as-is on any other type of surface is unknown.)