RGeo convex hull of list of points

Question

RGeo has convex hull method available, but no documentation at all in this matter.

Given set of Points, how to I find their convex hull?

Answer 1

Good question. Turns out there is a geometry type called "MultiPoint" that works for this. I made a simple example to test it out and it appears to work well.

f = RGeo::Geos.factory(:srid => 3361, :buffer_resolution => 8) #my typical local rectilinear projection factory with my default settings.
coords = [[1,1], [2,2], [1,3]]
points = []
coords.each {|x,y| points << f.point(x,y)}

f.multi_point(points).convex_hull