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| 1 | /* | ||
| 2 | * Copyright (c) 2000-2022 Inria | ||
| 3 | * All rights reserved. | ||
| 4 | * | ||
| 5 | * Redistribution and use in source and binary forms, with or without | ||
| 6 | * modification, are permitted provided that the following conditions are met: | ||
| 7 | * | ||
| 8 | * * Redistributions of source code must retain the above copyright notice, | ||
| 9 | * this list of conditions and the following disclaimer. | ||
| 10 | * * Redistributions in binary form must reproduce the above copyright notice, | ||
| 11 | * this list of conditions and the following disclaimer in the documentation | ||
| 12 | * and/or other materials provided with the distribution. | ||
| 13 | * * Neither the name of the ALICE Project-Team nor the names of its | ||
| 14 | * contributors may be used to endorse or promote products derived from this | ||
| 15 | * software without specific prior written permission. | ||
| 16 | * | ||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| 18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | ||
| 21 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
| 22 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
| 23 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| 24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | ||
| 25 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
| 26 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| 27 | * POSSIBILITY OF SUCH DAMAGE. | ||
| 28 | * | ||
| 29 | * Contact: Bruno Levy | ||
| 30 | * | ||
| 31 | * https://www.inria.fr/fr/bruno-levy | ||
| 32 | * | ||
| 33 | * Inria, | ||
| 34 | * Domaine de Voluceau, | ||
| 35 | * 78150 Le Chesnay - Rocquencourt | ||
| 36 | * FRANCE | ||
| 37 | * | ||
| 38 | */ | ||
| 39 | |||
| 40 | #ifndef GEOGRAM_VORONOI_RVD_MESH_BUILDER | ||
| 41 | #define GEOGRAM_VORONOI_RVD_MESH_BUILDER | ||
| 42 | |||
| 43 | #include <geogram/basic/common.h> | ||
| 44 | #include <geogram/voronoi/generic_RVD.h> | ||
| 45 | #include <geogram/mesh/mesh.h> | ||
| 46 | #include <geogram/mesh/index.h> | ||
| 47 | #include <geogram/basic/attributes.h> | ||
| 48 | #include <geogram/basic/argused.h> | ||
| 49 | |||
| 50 | #include <vector> | ||
| 51 | #include <map> | ||
| 52 | |||
| 53 | /** | ||
| 54 | * \file geogram/voronoi/RVD_mesh_builder.h | ||
| 55 | * \brief Utilities to build meshes derived from restricted Voronoi diagrams. | ||
| 56 | * \note This file contains functions and classes used by the internal | ||
| 57 | * implementation of GEO::GenericVoronoiDiagram. | ||
| 58 | * They are not meant to be used directly by client code. | ||
| 59 | */ | ||
| 60 | |||
| 61 | namespace GEO { | ||
| 62 | |||
| 63 | /** | ||
| 64 | * \brief RVDVertexMap maps symbolic vertices to unique ids. | ||
| 65 | * \details Symbolic vertices are manipulated by | ||
| 66 | * GEOGen::RestrictedVoronoiDiagram. This class is | ||
| 67 | * used for instance in the implementation of | ||
| 68 | * RVDMeshBuilder. | ||
| 69 | * \note This is an internal implementation class, not meant to | ||
| 70 | * be used directly, use GEO::RestrictedVoronoiDiagram instead. | ||
| 71 | */ | ||
| 72 | class GEOGRAM_API RVDVertexMap { | ||
| 73 | public: | ||
| 74 | /** | ||
| 75 | * \brief Constructs an empty map | ||
| 76 | */ | ||
| 77 | RVDVertexMap(); | ||
| 78 | |||
| 79 | /** | ||
| 80 | * \brief Maps the symbolic information of a vertex | ||
| 81 | * into a unique identifier. | ||
| 82 | * \param[in] center_vertex_id the index of the current Voronoi | ||
| 83 | * seed (provided by action classes in | ||
| 84 | * GEOGen::RestrictedVoronoiDiagram) | ||
| 85 | * \param[in] sym the symbolic representation of the vertex | ||
| 86 | * (provided by action classes in | ||
| 87 | * GEOGen::RestrictedVoronoiDiagram) | ||
| 88 | * \return a unique identifier for this vertex | ||
| 89 | */ | ||
| 90 | index_t find_or_create_vertex( | ||
| 91 | index_t center_vertex_id, const SymbolicVertex& sym | ||
| 92 | ); | ||
| 93 | |||
| 94 | /** | ||
| 95 | * \brief Defines the index of the first created vertex. | ||
| 96 | * \param[in] i index of the first vertex that will be created | ||
| 97 | * (default is 0). | ||
| 98 | */ | ||
| 99 | void set_first_vertex_index(index_t i) { | ||
| 100 | 1261 | nb_vertices_ = i; | |
| 101 | } | ||
| 102 | |||
| 103 | protected: | ||
| 104 | /** | ||
| 105 | * \brief Allocates a new vertex. | ||
| 106 | */ | ||
| 107 | index_t new_vertex() { | ||
| 108 | 290770 | index_t result = nb_vertices_; | |
| 109 | 290770 | nb_vertices_++; | |
| 110 | return result; | ||
| 111 | } | ||
| 112 | |||
| 113 | /** | ||
| 114 | * \brief Gets the number of bisectors represented | ||
| 115 | * in a symbolic vertex. | ||
| 116 | */ | ||
| 117 | index_t nb_bisectors(const signed_trindex& sym) const { | ||
| 118 | index_t result = 0; | ||
| 119 | for(index_t i = 0; i < 3; i++) { | ||
| 120 | if(sym.indices[i] >= 0) { | ||
| 121 | result++; | ||
| 122 | } | ||
| 123 | } | ||
| 124 | return result; | ||
| 125 | } | ||
| 126 | |||
| 127 | private: | ||
| 128 | // Maps (+++)-center vertex id quadruples to unique vertex id | ||
| 129 | // +++ encodes a Voronoi vertex | ||
| 130 | std::map<quadindex, index_t> ppp_to_id_; | ||
| 131 | |||
| 132 | // Maps (++-)-center vertex id quadruples to unique vertex id | ||
| 133 | // ++- encodes the intersection between a Voronoi edge (++) and | ||
| 134 | // a facet of the boundary (-). | ||
| 135 | std::map<signed_quadindex, index_t> ppm_to_id_; | ||
| 136 | |||
| 137 | // Maps (+--)-center vertex id quadruples to unique vertex id | ||
| 138 | // +-- encodes the intersection between a Voronoi facet (+) and | ||
| 139 | // an edge of the boundary (--). | ||
| 140 | std::map<signed_quadindex, index_t> pmm_to_id_; | ||
| 141 | |||
| 142 | // Maps boundary vertex index to unique vertex id. | ||
| 143 | vector<signed_index_t> bv_to_id_; | ||
| 144 | index_t nb_vertices_; | ||
| 145 | }; | ||
| 146 | |||
| 147 | /************************************************************************/ | ||
| 148 | |||
| 149 | /** | ||
| 150 | * \brief Builds a Mesh using the symbolic information | ||
| 151 | * in the vertices computed by a RestrictedVoronoiDiagram. | ||
| 152 | * \details The vertices with the same symbolic information are | ||
| 153 | * merged. | ||
| 154 | * \note This is an internal implementation class, not meant to | ||
| 155 | * be used directly, use GEO::RestrictedVoronoiDiagram instead. | ||
| 156 | */ | ||
| 157 | class RVDMeshBuilder { | ||
| 158 | public: | ||
| 159 | /** | ||
| 160 | * \brief Constructs a new RVDMeshBuilder | ||
| 161 | * \param[out] target where to build the mesh | ||
| 162 | * that represents the Restricted Voronoi Diagram | ||
| 163 | * \param[in] reference the input mesh | ||
| 164 | */ | ||
| 165 | 36 | RVDMeshBuilder( | |
| 166 | Mesh* target, Mesh* reference, | ||
| 167 | Delaunay* | ||
| 168 | 36 | ) : | |
| 169 |
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36 | target_(target), |
| 170 |
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36 | nb_vertices_(0) |
| 171 | { | ||
| 172 | 36 | dim_ = coord_index_t(reference->vertices.dimension()); | |
| 173 | 36 | current_seed_ = max_index_t(); | |
| 174 | 36 | } | |
| 175 | |||
| 176 | /** | ||
| 177 | * \brief Starts to build a new surface. | ||
| 178 | */ | ||
| 179 | 36 | void begin_surface() { | |
| 180 | 36 | target_->clear(); | |
| 181 | 36 | target_->vertices.set_dimension(dim_); | |
| 182 |
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36 | facet_region_.bind(target_->facets.attributes(),"region"); |
| 183 | 36 | } | |
| 184 | |||
| 185 | /** | ||
| 186 | * \brief Starts a new reference facet. | ||
| 187 | * \details Does nothing in this implementation | ||
| 188 | * that does not use the reference facet index. | ||
| 189 | * \param[in] ref_facet index of the reference facet (unused) | ||
| 190 | */ | ||
| 191 | void begin_reference_facet(index_t ref_facet) { | ||
| 192 | geo_argused(ref_facet); | ||
| 193 | 60502 | } | |
| 194 | |||
| 195 | /** | ||
| 196 | * \brief Starts a new facet of the restricted | ||
| 197 | * Voronoi diagram. | ||
| 198 | * \param[in] seed the Voronoi seed that | ||
| 199 | * corresponds to the new facet. | ||
| 200 | */ | ||
| 201 | void begin_facet(index_t seed) { | ||
| 202 | 210409 | current_seed_ = seed; | |
| 203 | 210409 | facet_vertices_.resize(0); | |
| 204 | } | ||
| 205 | |||
| 206 | /** | ||
| 207 | * \brief Adds a vertex to the current facet. | ||
| 208 | * \param[in] point coordinates of the vertex | ||
| 209 | * \param[in] sym symbolic representation of the vertex | ||
| 210 | */ | ||
| 211 | 841011 | void add_vertex_to_facet( | |
| 212 | const double* point, const SymbolicVertex& sym | ||
| 213 | ) { | ||
| 214 | 841011 | index_t id = vertex_map_.find_or_create_vertex( | |
| 215 | current_seed_, sym | ||
| 216 | 841011 | ); | |
| 217 |
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841011 | if(id >= nb_vertices_) { |
| 218 | 213296 | index_t v = target_->vertices.create_vertex(); | |
| 219 |
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853184 | for(index_t c=0; c<dim_; ++c) { |
| 220 | 639888 | target_->vertices.point_ptr(v)[c] = point[c]; | |
| 221 | } | ||
| 222 | 213296 | nb_vertices_ = id + 1; | |
| 223 | } | ||
| 224 |
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841011 | facet_vertices_.push_back(id); |
| 225 | 841011 | } | |
| 226 | |||
| 227 | /** | ||
| 228 | * \brief Terminates the current facet. | ||
| 229 | * \note The reference facet information is | ||
| 230 | * not used by this implementation. | ||
| 231 | */ | ||
| 232 | 210409 | void end_facet() { | |
| 233 |
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210409 | index_t f = target_->facets.create_polygon(facet_vertices_.size()); |
| 234 |
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2102840 | for(index_t lv=0; lv<facet_vertices_.size(); ++lv) { |
| 235 |
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841011 | target_->facets.set_vertex(f,lv,facet_vertices_[lv]); |
| 236 | } | ||
| 237 | 210409 | facet_region_[f] = current_seed_; | |
| 238 | 210409 | } | |
| 239 | |||
| 240 | /** | ||
| 241 | * \brief Terminates the current reference facet. | ||
| 242 | * \details Does nothing in this implementation. | ||
| 243 | */ | ||
| 244 | void end_reference_facet() { | ||
| 245 | } | ||
| 246 | |||
| 247 | /** | ||
| 248 | * \brief Terminates the current surface. | ||
| 249 | */ | ||
| 250 | void end_surface() { | ||
| 251 | 36 | target_->facets.connect(); | |
| 252 | 36 | facet_region_.unbind(); | |
| 253 | } | ||
| 254 | |||
| 255 | /** | ||
| 256 | * \brief Specifies the dimension to be used. | ||
| 257 | * \details Not implemented yet, uses the dimension | ||
| 258 | * of the RestrictedVoronoiDiagram. | ||
| 259 | */ | ||
| 260 | void set_dimension(coord_index_t x) { | ||
| 261 | geo_argused(x); | ||
| 262 | // TODO - Not implemented yet | ||
| 263 | } | ||
| 264 | |||
| 265 | private: | ||
| 266 | Mesh* target_; | ||
| 267 | Attribute<index_t> facet_region_; | ||
| 268 | RVDVertexMap vertex_map_; | ||
| 269 | coord_index_t dim_; | ||
| 270 | index_t current_seed_; | ||
| 271 | index_t nb_vertices_; | ||
| 272 | vector<index_t> facet_vertices_; | ||
| 273 | }; | ||
| 274 | |||
| 275 | /************************************************************************/ | ||
| 276 | } | ||
| 277 | |||
| 278 | #endif | ||
| 279 |