CirculatorsT.hh 16.3 KB
Newer Older
Jan Möbius's avatar
Jan Möbius committed
1 2 3
/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
Jan Möbius's avatar
Jan Möbius committed
4
 *      Copyright (C) 2001-2012 by Computer Graphics Group, RWTH Aachen      *
Jan Möbius's avatar
Jan Möbius committed
5 6 7
 *                           www.openmesh.org                                *
 *                                                                           *
 *---------------------------------------------------------------------------* 
8
 *  This file is part of OpenMesh.                                           *
Jan Möbius's avatar
Jan Möbius committed
9
 *                                                                           *
10 11 12 13 14
 *  OpenMesh is free software: you can redistribute it and/or modify         * 
 *  it under the terms of the GNU Lesser General Public License as           *
 *  published by the Free Software Foundation, either version 3 of           *
 *  the License, or (at your option) any later version with the              *
 *  following exceptions:                                                    *
Jan Möbius's avatar
Jan Möbius committed
15
 *                                                                           *
16 17 18 19 20 21 22
 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
Jan Möbius's avatar
Jan Möbius committed
23
 *                                                                           *
24 25 26 27
 *  OpenMesh is distributed in the hope that it will be useful,              *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            *
 *  GNU Lesser General Public License for more details.                      *
Jan Möbius's avatar
Jan Möbius committed
28
 *                                                                           *
29 30 31 32 33 34 35 36 37 38
 *  You should have received a copy of the GNU LesserGeneral Public          *
 *  License along with OpenMesh.  If not,                                    *
 *  see <http://www.gnu.org/licenses/>.                                      *
 *                                                                           *
\*===========================================================================*/ 

/*===========================================================================*\
 *                                                                           *             
 *   $Revision$                                                         *
 *   $Date$                   *
Jan Möbius's avatar
Jan Möbius committed
39 40
 *                                                                           *
\*===========================================================================*/
41

Jan Möbius's avatar
Jan Möbius committed
42 43 44 45 46 47 48 49 50 51 52 53 54
#ifndef OPENMESH_CIRCULATORS_HH
#define OPENMESH_CIRCULATORS_HH
//=============================================================================
//
//  Vertex and Face circulators for PolyMesh/TriMesh
//
//=============================================================================



//== INCLUDES =================================================================

#include <OpenMesh/Core/System/config.h>
55
#include <cassert>
56
#include <cstddef>
Matthias Möller's avatar
Matthias Möller committed
57
#include <iterator>
Jan Möbius's avatar
Jan Möbius committed
58 59 60 61 62 63

//== NAMESPACES ===============================================================

namespace OpenMesh {
namespace Iterators {

64 65 66 67 68 69
template<class Mesh, class CenterEntityHandle>
class GenericCirculator_CenterEntityFnsT {
    public:
        static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter);
        static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter);
};
Jan Möbius's avatar
Jan Möbius committed
70

71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
template<class Mesh>
class GenericCirculator_CenterEntityFnsT<Mesh, typename Mesh::VertexHandle> {
    public:
        inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            heh = mesh->cw_rotated_halfedge_handle(heh);
            if (heh == start) ++lap_counter;
        }
        inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            if (heh == start) --lap_counter;
            heh = mesh->ccw_rotated_halfedge_handle(heh);
        }
};

template<class Mesh>
class GenericCirculator_CenterEntityFnsT<Mesh, typename Mesh::FaceHandle> {
    public:
        inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            heh = mesh->next_halfedge_handle(heh);
            if (heh == start) ++lap_counter;
        }
        inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            if (heh == start) --lap_counter;
            heh = mesh->prev_halfedge_handle(heh);
        }
};

97 98 99 100 101 102 103 104 105
template<class Mesh, class CenterEntityHandle, class ValueHandle>
class GenericCirculator_DereferenciabilityCheckT {
    public:
        //inline static bool isDereferenciable(const Mesh *mesh, const typename Mesh::HalfedgeHandle &heh, const typename Mesh::HalfedgeHandle &start, const int &lap_counter);
};

template<class Mesh>
class GenericCirculator_DereferenciabilityCheckT<Mesh, typename Mesh::FaceHandle, typename Mesh::FaceHandle> {
    public:
106
        inline static bool isDereferenciable(const Mesh *mesh, const typename Mesh::HalfedgeHandle &heh) {
107 108 109 110 111 112 113
            return mesh->face_handle(mesh->opposite_halfedge_handle(heh)).is_valid();
        }
};

template<class Mesh>
class GenericCirculator_DereferenciabilityCheckT<Mesh, typename Mesh::VertexHandle, typename Mesh::FaceHandle> {
    public:
114
        inline static bool isDereferenciable(const Mesh *mesh, const typename Mesh::HalfedgeHandle &heh) {
115 116 117 118
            return mesh->face_handle(heh).is_valid();
        }
};

119 120 121
template<class Mesh, class CenterEntityHandle, class ValueHandle>
class GenericCirculator_ValueHandleFnsT {
    public:
122
        inline static bool is_valid(const typename Mesh::HalfedgeHandle &heh, const typename Mesh::HalfedgeHandle &start, const int &lap_counter) {
123 124
            return heh.is_valid() && ((start != heh) || (lap_counter == 0));
        }
125
        inline static void init(const Mesh*, typename Mesh::HalfedgeHandle&, typename Mesh::HalfedgeHandle&, int&) {};
126 127 128 129 130 131 132 133 134 135 136
        inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            GenericCirculator_CenterEntityFnsT<Mesh, CenterEntityHandle>::increment(mesh, heh, start, lap_counter);
        }
        inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            GenericCirculator_CenterEntityFnsT<Mesh, CenterEntityHandle>::decrement(mesh, heh, start, lap_counter);
        }
};

template<class Mesh, class CenterEntityHandle>
class GenericCirculator_ValueHandleFnsT<Mesh, CenterEntityHandle, typename Mesh::FaceHandle> {
    public:
137 138
        typedef GenericCirculator_DereferenciabilityCheckT<Mesh, CenterEntityHandle, typename Mesh::FaceHandle> GenericCirculator_DereferenciabilityCheck;

139
        inline static bool is_valid(const typename Mesh::HalfedgeHandle &heh, const typename Mesh::HalfedgeHandle &start, const int &lap_counter) {
140 141 142
            return heh.is_valid() && ((start != heh) || (lap_counter == 0));
        }
        inline static void init(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
143
            if (heh.is_valid() && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh) && lap_counter == 0)
144 145 146 147 148
                increment(mesh, heh, start, lap_counter);
        };
        inline static void increment(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            do {
                GenericCirculator_CenterEntityFnsT<Mesh, CenterEntityHandle>::increment(mesh, heh, start, lap_counter);
149
            } while (is_valid(heh, start, lap_counter) && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh));
150 151 152 153
        }
        inline static void decrement(const Mesh *mesh, typename Mesh::HalfedgeHandle &heh, typename Mesh::HalfedgeHandle &start, int &lap_counter) {
            do {
                GenericCirculator_CenterEntityFnsT<Mesh, CenterEntityHandle>::decrement(mesh, heh, start, lap_counter);
154
            } while (is_valid(heh, start, lap_counter) && !GenericCirculator_DereferenciabilityCheck::isDereferenciable(mesh, heh));
155 156
        }
};
Jan Möbius's avatar
Jan Möbius committed
157

158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176
template<class Mesh>
class GenericCirculatorBaseT {
    public:
        typedef const Mesh* mesh_ptr;
        typedef const Mesh& mesh_ref;

    public:
        GenericCirculatorBaseT() : mesh_(0), lap_counter_(0) {}

        GenericCirculatorBaseT(mesh_ref mesh, HalfedgeHandle heh, bool end = false) :
            mesh_(&mesh), start_(heh), heh_(heh), lap_counter_(static_cast<int>(end)) {}

        GenericCirculatorBaseT(const GenericCirculatorBaseT &rhs) :
            mesh_(rhs.mesh_), start_(rhs.start_), heh_(rhs.heh_), lap_counter_(rhs.lap_counter_) {}

        inline typename Mesh::FaceHandle toFaceHandle() const {
            return mesh_->face_handle(heh_);
        }

177 178 179 180
        inline typename Mesh::FaceHandle toOppositeFaceHandle() const {
            return mesh_->face_handle(toOppositeHalfedgeHandle());
        }

181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
        inline typename Mesh::EdgeHandle toEdgeHandle() const {
            return mesh_->edge_handle(heh_);
        }

        inline typename Mesh::HalfedgeHandle toHalfedgeHandle() const {
            return heh_;
        }

        inline typename Mesh::HalfedgeHandle toOppositeHalfedgeHandle() const {
            return mesh_->opposite_halfedge_handle(heh_);
        }

        inline typename Mesh::VertexHandle toVertexHandle() const {
            return mesh_->to_vertex_handle(heh_);
        }

        inline GenericCirculatorBaseT &operator=(const GenericCirculatorBaseT &rhs) {
            mesh_ = rhs.mesh_;
            start_ = rhs.start_;
            heh_ = rhs.heh_;
            lap_counter_ = rhs.lap_counter_;
            return *this;
        }

        inline bool operator==(const GenericCirculatorBaseT &rhs) const {
            return mesh_ == rhs.mesh_ && start_ == rhs.start_ && heh_ == rhs.heh_ && lap_counter_ == rhs.lap_counter_;
        }

        inline bool operator!=(const GenericCirculatorBaseT &rhs) const {
            return !operator==(rhs);
        }

    protected:
        mesh_ptr mesh_;
        typename Mesh::HalfedgeHandle start_, heh_;
        int lap_counter_;
};
Jan Möbius's avatar
Jan Möbius committed
218

219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275
template<class Mesh, class CenterEntityHandle, class ValueHandle,
        ValueHandle (GenericCirculatorBaseT<Mesh>::*Handle2Value)() const>
class GenericCirculatorT : protected GenericCirculatorBaseT<Mesh> {
    public:
        typedef std::ptrdiff_t difference_type;
        typedef ValueHandle value_type;
        typedef const value_type& reference;
        typedef const value_type* pointer;
        typedef std::bidirectional_iterator_tag iterator_category;

        typedef typename GenericCirculatorBaseT<Mesh>::mesh_ptr mesh_ptr;
        typedef typename GenericCirculatorBaseT<Mesh>::mesh_ref mesh_ref;
        typedef GenericCirculator_ValueHandleFnsT<Mesh, CenterEntityHandle, ValueHandle> GenericCirculator_ValueHandleFns;

    public:
        GenericCirculatorT() {}
        GenericCirculatorT(mesh_ref mesh, CenterEntityHandle start, bool end = false) :
            GenericCirculatorBaseT<Mesh>(mesh, mesh.halfedge_handle(start), end) {

            GenericCirculator_ValueHandleFns::init(this->mesh_, this->heh_, this->start_, this->lap_counter_);
        }
        GenericCirculatorT(mesh_ref mesh, HalfedgeHandle heh, bool end = false) :
            GenericCirculatorBaseT<Mesh>(mesh, heh, end) {

            GenericCirculator_ValueHandleFns::init(this->mesh_, this->heh_, this->start_, this->lap_counter_);
        }
        GenericCirculatorT(const GenericCirculatorT &rhs) : GenericCirculatorBaseT<Mesh>(rhs) {}

        GenericCirculatorT& operator++() {
            assert(this->mesh_);
            GenericCirculator_ValueHandleFns::increment(this->mesh_, this->heh_, this->start_, this->lap_counter_);
            return *this;
        }
        GenericCirculatorT& operator--() {
            assert(this->mesh_);
            GenericCirculator_ValueHandleFns::decrement(this->mesh_, this->heh_, this->start_, this->lap_counter_);
            return *this;
        }

        /// Post-increment
        GenericCirculatorT operator++(int) {
            assert(this->mesh_);
            GenericCirculatorT cpy(*this);
            ++(*this);
            return cpy;
        }

        /// Post-decrement
        GenericCirculatorT operator--(int) {
            assert(this->mesh_);
            GenericCirculatorT cpy(*this);
            --(*this);
            return cpy;
        }

        /// Standard dereferencing operator.
        value_type operator*() const {
276 277 278 279 280 281
#ifndef NDEBUG
            assert(this->heh_.is_valid());
            value_type res = (this->*Handle2Value)();
            assert(res.is_valid());
            return res;
#else
282
            return (this->*Handle2Value)();
283
#endif
284 285
        }

286 287 288 289 290 291 292 293 294 295 296
        /**
         * @brief Pointer dereferentiation.
         *
         * This returns a pointer which points to a handle
         * that loses its validity once this dereferentiation is
         * invoked again. Thus, do not store the result of
         * this operation.
         */
        pointer operator->() const {
            pointer_deref_value = **this;
            return &pointer_deref_value;
297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
        }

        GenericCirculatorT &operator=(const GenericCirculatorT &rhs) {
            GenericCirculatorBaseT<Mesh>::operator=(rhs);
            return *this;
        };

        bool operator==(const GenericCirculatorT &rhs) const {
            return GenericCirculatorBaseT<Mesh>::operator==(rhs);
        }

        bool operator!=(const GenericCirculatorT &rhs) const {
            return GenericCirculatorBaseT<Mesh>::operator!=(rhs);
        }

        bool is_valid() const {
313
            return GenericCirculator_ValueHandleFns::is_valid(this->heh_, this->start_, this->lap_counter_);
314 315
        }

Jan Möbius's avatar
Jan Möbius committed
316
        //DEPRECATED("current_halfedge_handle() is an implementation detail and should not be accessed from outside the iterator class.")
317 318 319 320 321
        /**
         * \deprecated
         * current_halfedge_handle() is an implementation detail and should not
         * be accessed from outside the iterator class.
         */
322 323 324 325
        const HalfedgeHandle &current_halfedge_handle() const {
            return this->heh_;
        }

326
        DEPRECATED("Do not use this error prone implicit cast. Compare to end-iterator or use is_valid(), instead.")
327 328 329 330 331
        /**
         * \deprecated
         * Do not use this error prone implicit cast. Compare to the
         * end-iterator or use is_valid() instead.
         */
332 333 334 335
        operator bool() const {
            return is_valid();
        }

336 337 338 339 340
        /**
         * \brief Return the handle of the current target.
         * \deprecated
         * This function clutters your code. Use dereferencing operators -> and * instead.
         */
341 342 343 344 345
        DEPRECATED("This function clutters your code. Use dereferencing operators -> and * instead.")
        value_type handle() const {
          return **this;
        }

346 347 348 349 350 351
        /**
         * \brief Cast to the handle of the current target.
         * \deprecated
         * Implicit casts of iterators are unsafe. Use dereferencing operators
         * -> and * instead.
         */
352 353 354 355
        DEPRECATED("Implicit casts of iterators are unsafe. Use dereferencing operators -> and * instead.")
        operator value_type() const {
          return **this;
        }
356 357 358 359 360 361

        template<typename STREAM>
        friend STREAM &operator<< (STREAM &s, const GenericCirculatorT &self) {
            return s << self.mesh_ << ", " << self.start_.idx() << ", " << self.heh_.idx() << ", " << self.lap_counter_;
        }

362 363
    private:
        mutable value_type pointer_deref_value;
364
};
Jan Möbius's avatar
Jan Möbius committed
365 366 367

} // namespace Iterators
} // namespace OpenMesh
368

Jan Möbius's avatar
Jan Möbius committed
369
#endif