muspan.helpers.

alpha_shape

alpha_shape(points, alpha, internal_area_threshold=0, internal_boundaries=True)

Compute the alpha shape of a set of points. The alpha shape returns a list of boundary points together with a list of internal boundary points, (the format required by MuSpAn to make a list of shape objects).

Parameters:

pointsnp.ndarray

Array of shape (k, 2) containing the points.

alphafloat

Alpha value to influence the shape.

Returns:

alpha_shapeslist

A list where each element is a tuple containing the outer boundary points (m, 2) and a list of internal boundary points, each of shape (n_i, 2).

Notes

Both internal_area_threshold and internal_boundaries are legacy arguments and are no longer used.