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LongestEdgeT.hh
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33 \*==========================================================================*/
34
35 /*==========================================================================*\
36 * *
37 * $Revision: 410 $ *
38 * $Date: 2010-06-17 12:45:58 +0200 (Do, 17. Jun 2010) $ *
39 * *
40 \*==========================================================================*/
41
46 //=============================================================================
47 //
48 // CLASS LongestEdgeT
49 //
50 //=============================================================================
51
52
53 #ifndef LINEAR_H
54 #define LINEAR_H
55
56 #include <OpenMesh/Tools/Subdivider/Uniform/SubdividerT.hh>
57 #include <OpenMesh/Core/Utils/vector_cast.hh>
58 #include <OpenMesh/Core/Utils/Property.hh>
59 // -------------------- STL
60 #include <vector>
61 #include <queue>
62 #if defined(OM_CC_MIPS)
63 # include <math.h>
64 #else
65 # include <cmath>
66 #endif
67
68
69 //== NAMESPACE ================================================================
70
71 namespace OpenMesh { // BEGIN_NS_OPENMESH
72 namespace Subdivider { // BEGIN_NS_DECIMATER
73 namespace Uniform { // BEGIN_NS_UNIFORM
74
75
76 //== CLASS DEFINITION =========================================================
77
78 template <typename MeshType, typename RealType = float>
79 class CompareLengthFunction {
80 public:
81
82 typedef std::pair<typename MeshType::EdgeHandle, RealType> queueElement;
83
84 bool operator()(const queueElement& t1, const queueElement& t2) // Returns true if t1 is smaller than t2
85 {
86 return (t1.second < t2.second);
87 }
88 };
89
90
97 template <typename MeshType, typename RealType = float>
98 class LongestEdgeT : public SubdividerT<MeshType, RealType>
99 {
100 public:
101
102 typedef RealType real_t;
103 typedef MeshType mesh_t;
104 typedef SubdividerT< mesh_t, real_t > parent_t;
105
106 typedef std::vector< std::vector<real_t> > weights_t;
107 typedef std::vector<real_t> weight_t;
108
109 typedef std::pair< typename mesh_t::EdgeHandle, real_t > queueElement;
110
111 public:
112
113
114 LongestEdgeT() : parent_t()
115 { }
116
117
118 LongestEdgeT( mesh_t& _m) : parent_t(_m)
119 { }
120
121
122 ~LongestEdgeT() {}
123
124
125 public:
126
127
128 const char *name() const { return "Longest Edge Split"; }
129
130 void set_max_edge_length(double _value) {
131 max_edge_length_squared_ = _value * _value;
132 }
133
134 protected:
135
136
137 bool prepare( mesh_t& _m )
138 {
139 return true;
140 }
141
142
143 bool cleanup( mesh_t& _m )
144 {
145 return true;
146 }
147
148
149 bool subdivide( MeshType& _m, size_t _n , const bool _update_points = true)
150 {
151
152 // Sorted queue containing all edges sorted by their decreasing length
153 std::priority_queue< queueElement, std::vector< queueElement > , CompareLengthFunction< mesh_t, real_t > > queue;
154
155 // Build the initial queue
156 // First element should be longest edge
157 typename mesh_t::EdgeIter edgesEnd = _m.edges_end();
158 for ( typename mesh_t::EdgeIter eit = _m.edges_begin(); eit != edgesEnd; ++eit) {
159 const typename MeshType::Point to = _m.point(_m.to_vertex_handle(_m.halfedge_handle(eit,0)));
160 const typename MeshType::Point from = _m.point(_m.from_vertex_handle(_m.halfedge_handle(eit,0)));
161
162 real_t length = (to - from).sqrnorm();
163
164 // Only push the edges that need to be split
165 if ( length > max_edge_length_squared_ )
166 queue.push( queueElement(eit.handle(),length) );
167 }
168
169 bool stop = false;
170 while ( !stop && ! queue.empty() ) {
171 queueElement a = queue.top();
172 queue.pop();
173
174 if ( a.second < max_edge_length_squared_ ) {
175 stop = true;
176 break;
177 } else {
178 const typename MeshType::Point to = _m.point(_m.to_vertex_handle(_m.halfedge_handle(a.first,0)));
179 const typename MeshType::Point from = _m.point(_m.from_vertex_handle(_m.halfedge_handle(a.first,0)));
180 const typename MeshType::Point midpoint = 0.5 * ( to + from );
181
182 const typename MeshType::VertexHandle newVertex = _m.add_vertex(midpoint);
183 _m.split(a.first,newVertex);
184
185 for ( typename MeshType::VertexOHalfedgeIter voh_it(_m,newVertex); voh_it; ++voh_it) {
186 typename MeshType::EdgeHandle eh = _m.edge_handle(voh_it.handle());
187 const typename MeshType::Point to = _m.point(_m.to_vertex_handle(voh_it));
188 const typename MeshType::Point from = _m.point(_m.from_vertex_handle(voh_it));
189 real_t length = (to - from).sqrnorm();
190
191 // Only push the edges that need to be split
192 if ( length > max_edge_length_squared_ )
193 queue.push( queueElement(eh,length) );
194
195 }
196 }
197 }
198
199 #if defined(_DEBUG) || defined(DEBUG)
200 // Now we have an consistent mesh!
201 assert( OpenMesh::Utils::MeshCheckerT<mesh_t>(_m).check() );
202 #endif
203
204
205 return true;
206 }
207
208
209 private: // data
210 real_t max_edge_length_squared_;
211
212 };
213
214 } // END_NS_UNIFORM
215 } // END_NS_SUBDIVIDER
216 } // END_NS_OPENMESH
217 #endif
218