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// Copyright (c) 2019 CNRS and LIRIS' Establishments (France). // All rights reserved. // // This file is part of CGAL (www.cgal.org). // // $URL: https://github.com/CGAL/cgal/blob/v6.1/Surface_mesh_topology/include/CGAL/Curves_on_surface_topology.h $ // $Id: include/CGAL/Curves_on_surface_topology.h b26b07a1242 $ // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial // // Author(s) : Guillaume Damiand // #ifndef CGAL_CURVES_ON_SURFACE_TOPOLOGY_H #define CGAL_CURVES_ON_SURFACE_TOPOLOGY_H 1 #include #include #include #include #include #include namespace CGAL { namespace Surface_mesh_topology { template class Curves_on_surface_topology { public: // Types for minimal quadrangulation using Minimal_quadrangulation=internal::Minimal_quadrangulation; using Reduced_map =typename Minimal_quadrangulation::Local_map; // Types for shortest noncontractible cycle using Shortest_noncontractible_cycle=typename internal::Shortest_noncontractible_cycle; using Facewidth =typename internal::Facewidth; using Dart_const_descriptor =typename Shortest_noncontractible_cycle::Original_dart_const_descriptor; using halfedge_descriptor =Dart_const_descriptor ; // To be compatible with BGL // Constructor Curves_on_surface_topology(const Mesh& amesh, bool /* display_time */=false) : m_original_mesh(amesh), m_minimal_quadrangulation(nullptr), m_shortest_noncontractible_cycle(nullptr), m_facewidth(nullptr), m_is_verbose(false) {} //================================================================================ // Homotopy test /// @return true iff the minimal quadrangulation is computed. bool is_minimal_quadrangulation_computed() const { return m_minimal_quadrangulation!=nullptr; } /// Computes the minimal quadrangulation if it is not yet computed. void compute_minimal_quadrangulation(bool display_time=true) const { if (m_minimal_quadrangulation==nullptr) { m_minimal_quadrangulation=std::make_unique (m_original_mesh, display_time); } } /// Return the reduced map computed in the minimal quadrangulation. /// @pre is_minimal_quadrangulation_computed() const Reduced_map& get_minimal_quadrangulation() const { CGAL_assertion(is_minimal_quadrangulation_computed()); return m_minimal_quadrangulation->get_local_map(); } /// @return true iff 'p' is contractible. bool is_contractible(const Path_on_surface& p, bool display_time=false) const { compute_minimal_quadrangulation(display_time); return m_minimal_quadrangulation->is_contractible(p, display_time, m_is_verbose); } /// @return true iff 'p1' and 'p2' are freely homotopic. bool are_freely_homotopic(const Path_on_surface& p1, const Path_on_surface& p2, bool display_time=false) const { compute_minimal_quadrangulation(display_time); return m_minimal_quadrangulation->are_freely_homotopic(p1, p2, display_time, m_is_verbose); } /// @return true iff 'p1' and 'p2' are base point freely homotopic. bool are_base_point_homotopic(const Path_on_surface& p1, const Path_on_surface& p2, bool display_time=false) const { compute_minimal_quadrangulation(display_time); return m_minimal_quadrangulation->are_base_point_homotopic(p1, p2, display_time, m_is_verbose); } //================================================================================ // Shortest noncontractible cycle; edge and face width bool is_shortest_noncontractible_cycle_representation_computed() const { return m_shortest_noncontractible_cycle!=nullptr; } void compute_shortest_non_contractible_cycle_representation(bool display_time=false) const { if (m_shortest_noncontractible_cycle==nullptr) { m_shortest_noncontractible_cycle=std::make_unique (m_original_mesh, display_time); } } template Path_on_surface compute_shortest_non_contractible_cycle_with_base_point (Dart_const_descriptor dh, const WeightFunctor& wf, bool display_time=false) const { compute_shortest_non_contractible_cycle_representation(display_time); return m_shortest_noncontractible_cycle->compute_cycle(dh, NULL, wf, display_time); } Path_on_surface compute_shortest_non_contractible_cycle_with_base_point (Dart_const_descriptor dh, bool display_time=false) const { compute_shortest_non_contractible_cycle_representation(display_time); return m_shortest_noncontractible_cycle->compute_cycle(dh, display_time); } Path_on_surface compute_shortest_non_contractible_cycle (bool display_time=false) const { compute_shortest_non_contractible_cycle_representation(display_time); return m_shortest_noncontractible_cycle-> compute_shortest_non_contractible_cycle(nullptr, display_time); } template Path_on_surface compute_shortest_non_contractible_cycle (const WeightFunctor& wf, bool display_time=false) const { compute_shortest_non_contractible_cycle_representation(display_time); return m_shortest_noncontractible_cycle-> compute_shortest_non_contractible_cycle(nullptr, wf, display_time); } Path_on_surface compute_edge_width(bool display_time=false) const { compute_shortest_non_contractible_cycle_representation(display_time); return m_shortest_noncontractible_cycle->compute_edge_width(display_time); } bool is_facewidth_representation_computed() const { return m_facewidth!=nullptr; } void compute_face_width_representation(bool display_time=false) const { if (m_facewidth==nullptr) { m_facewidth=std::make_unique(m_original_mesh, display_time); } } std::vector compute_face_width(bool display_time=false) const { compute_face_width_representation(display_time); return m_facewidth->compute_face_width(display_time); } //================================================================================ // Test whether a path is homotopic to a simple cycle bool is_homotopic_to_simple_cycle(const Path_on_surface& p, bool display_time=false) const { compute_minimal_quadrangulation(display_time); return m_minimal_quadrangulation->is_homotopic_to_simple_cycle(p, display_time, m_is_verbose); } //================================================================================ // Utility functions // Set whether to display warning message in `std::cerr` when input doesn't meet // prerequisite void set_verbose(bool is_verbose) { m_is_verbose = is_verbose; } protected: const Mesh& m_original_mesh; mutable std::unique_ptr m_minimal_quadrangulation; mutable std::unique_ptr m_shortest_noncontractible_cycle; mutable std::unique_ptr m_facewidth; bool m_is_verbose; }; } // namespace Surface_mesh_topology } // namespace CGAL #endif // CGAL_CURVES_ON_SURFACE_TOPOLOGY_H // // EOF //