Dima Semyushkin devgru

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Forked from https://gist.github.com/veltman/403f95aee728d4a043b142c52c113f82

Implementing a variation of Joachim Ungar's curved label placement method described here. The basic process is:

1. Turn the shape into a polygon of evenly-spaced points.
2. Generate a Voronoi diagram of those points.
3. Clip the edges.
4. Turn the edges into a graph.
5. Find the "longest shortest path" between any pair of perimeter nodes.
6. Smooth/simplify that path a bit.