Possible s2_point_on_surface implementation

[kylebutts]

Hi there,

I'm really excited about this package, especially the speed of s2 versus geos. One of my favorite functions in sf is the st_point_on_surface which always returns a point near the centroid that lies within the polygon. Is this possible in s2 as well?

[paleolimbot]

I'm glad you like the package! I'm not aware of an existing implementation in the S2 library but will keep this open as a reminder to look.

[paleolimbot]

I don't see anything specifically implemented for a S2Polygon, but we can link together a closest edge query and a centroid to get this implemented in the R package (a note-to-self, since I'm planning to spend some time on S2 in January).

[paleolimbot]

Just kidding...S2Polygon::Project(S2Polygon::Centroid()) will do this!

[kylebutts]

I can submit a pull request with s2_point_on_surface() if you would welcome that request

[paleolimbot]

I'd love that if you feel up for it!

[kylebutts]

See #161