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#!/usr/bin/env python
from gudhi import random_point_generators
from gudhi import AlphaComplex, SimplexTree
from gudhi import plot_persistence_barcode, plot_persistence_diagram
import matplotlib.pyplot as plt
""" This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
Author(s): Hind Montassif
Copyright (C) 2021 Inria
Modification(s):
- YYYY/MM Author: Description of the modification
"""
__author__ = "Hind Montassif"
__copyright__ = "Copyright (C) 2021 Inria"
__license__ = "MIT"
print("#####################################################################")
print("AlphaComplex creation from generated points")
# Generate a circle: 50 points; dim 2; radius 1
points = random_point_generators.generate_points_on_sphere_d(50, 2, 1)
# Plot the generated points (to uncomment if wished)
#plt.scatter(points[:,0], points[:,1])
#plt.show()
# Create an alpha complex
alpha_complex = AlphaComplex(points=points)
simplex_tree = alpha_complex.create_simplex_tree()
result_str = 'Alpha complex is of dimension ' + repr(simplex_tree.dimension()) + ' - ' + \
repr(simplex_tree.num_simplices()) + ' simplices - ' + \
repr(simplex_tree.num_vertices()) + ' vertices.'
print(result_str)
# Compute the persistence
diag = simplex_tree.persistence()
# Plot the barcode and diagram (to uncomment if wished)
#plot_persistence_barcode(diag)
#plt.show()
#plot_persistence_diagram(diag)
#plt.show()
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