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# 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
from cython cimport numeric
from libcpp.vector cimport vector
from libcpp.utility cimport pair
from libc.stdint cimport intptr_t
from gudhi.simplex_tree cimport *
from gudhi.simplex_tree import SimplexTree
__author__ = "Vincent Rouvreau"
__copyright__ = "Copyright (C) 2016 Inria"
__license__ = "GPL v3"
cdef extern from "Euclidean_witness_complex_interface.h" namespace "Gudhi":
cdef cppclass Euclidean_witness_complex_interface "Gudhi::witness_complex::Euclidean_witness_complex_interface":
Euclidean_witness_complex_interface(vector[vector[double]] landmarks, vector[vector[double]] witnesses)
void create_simplex_tree(Simplex_tree_interface_full_featured* simplex_tree, double max_alpha_square)
void create_simplex_tree(Simplex_tree_interface_full_featured* simplex_tree, double max_alpha_square,
unsigned limit_dimension)
vector[double] get_point(unsigned vertex)
# EuclideanWitnessComplex python interface
cdef class EuclideanWitnessComplex:
"""Constructs (weak) witness complex for given sets of witnesses and
landmarks in Euclidean space.
"""
cdef Euclidean_witness_complex_interface * thisptr
# Fake constructor that does nothing but documenting the constructor
def __init__(self, landmarks=None, witnesses=None):
"""WitnessComplex constructor.
:param landmarks: A list of landmarks (in the point cloud).
:type landmarks: list of list of double
:param witnesses: The point cloud.
:type witnesses: list of list of double
"""
# The real cython constructor
def __cinit__(self, landmarks=None, witnesses=None):
if landmarks is not None and witnesses is not None:
self.thisptr = new Euclidean_witness_complex_interface(landmarks, witnesses)
def __dealloc__(self):
if self.thisptr != NULL:
del self.thisptr
def __is_defined(self):
"""Returns true if WitnessComplex pointer is not NULL.
"""
return self.thisptr != NULL
def create_simplex_tree(self, max_alpha_square, limit_dimension = -1):
"""
:param max_alpha_square: The maximum alpha square threshold the
simplices shall not exceed. Default is set to infinity.
:type max_alpha_square: float
:returns: A simplex tree created from the Delaunay Triangulation.
:rtype: SimplexTree
"""
stree = SimplexTree()
cdef intptr_t stree_int_ptr=stree.thisptr
if limit_dimension != -1:
self.thisptr.create_simplex_tree(<Simplex_tree_interface_full_featured*>stree_int_ptr,
max_alpha_square, limit_dimension)
else:
self.thisptr.create_simplex_tree(<Simplex_tree_interface_full_featured*>stree_int_ptr,
max_alpha_square)
return stree
def get_point(self, vertex):
"""This function returns the point corresponding to a given vertex.
:param vertex: The vertex.
:type vertex: int.
:returns: The point.
:rtype: list of float
"""
cdef vector[double] point = self.thisptr.get_point(vertex)
return point
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