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+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
+
+""" 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__ = "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
+ cdef Simplex_tree_interface_full_featured* stree_ptr = <Simplex_tree_interface_full_featured*>stree_int_ptr
+ if limit_dimension is not -1:
+ self.thisptr.create_simplex_tree(stree_ptr, max_alpha_square, limit_dimension)
+ else:
+ self.thisptr.create_simplex_tree(stree_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
+