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#!/usr/bin/env python
import gudhi
import argparse
""" 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): Vincent Rouvreau
Copyright (C) 2016 Inria
Modification(s):
- YYYY/MM Author: Description of the modification
"""
__author__ = "Vincent Rouvreau"
__copyright__ = "Copyright (C) 2016 Inria"
__license__ = "MIT"
parser = argparse.ArgumentParser(description='AlphaComplex creation from '
'points read in a OFF file.',
epilog='Example: '
'example/alpha_complex_diagram_persistence_from_off_file_example.py '
'-f ../data/points/tore3D_300.off -a 0.6'
'- Constructs a alpha complex with the '
'points from the given OFF file.')
parser.add_argument("-f", "--file", type=str, required=True)
parser.add_argument("-a", "--max_alpha_square", type=float, default=0.5)
parser.add_argument("-b", "--band", type=float, default=0.)
parser.add_argument('--no-diagram', default=False, action='store_true' , help='Flag for not to display the diagrams')
args = parser.parse_args()
with open(args.file, 'r') as f:
first_line = f.readline()
if (first_line == 'OFF\n') or (first_line == 'nOFF\n'):
print("#####################################################################")
print("AlphaComplex creation from points read in a OFF file")
message = "AlphaComplex with max_edge_length=" + repr(args.max_alpha_square)
print(message)
alpha_complex = gudhi.AlphaComplex(off_file=args.file)
simplex_tree = alpha_complex.create_simplex_tree(max_alpha_square=args.max_alpha_square)
message = "Number of simplices=" + repr(simplex_tree.num_simplices())
print(message)
diag = simplex_tree.persistence()
print("betti_numbers()=")
print(simplex_tree.betti_numbers())
if args.no_diagram == False:
pplot = gudhi.plot_persistence_diagram(diag, band=args.band)
pplot.show()
else:
print(args.file, "is not a valid OFF file")
f.close()
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