I'm using the alphashape toolbox (alphashape 1.3.1) to calculate a concave hull polygon for a set of points and I'm getting one convex polygon when alpha=6 and two polygons when alpha=7.
xy_p = [(0.2, 0.1), (0.3, 0.1), (0.4, 0.1), (0.4, 0.2), (0.4, 0.3), (0.4, 0.4), (0.4, 0.5), (0.4, 0.6), (0.3, 0.6), (0.2, 0.6), (0.2, 0.5), (0.3, 0.5), (0.4, 0.4), (0.4, 0.3), (0.3, 0.2), (0.2, 0.2)]
alpha_shape = alphashape.alphashape(xy_p, 6)
when alpha=7:
alpha_shape = alphashape.alphashape(xy_p, 7)
What should I do get one concave polygon like this:
