TriConnectivity.hh 5.17 KB
 Jan Möbius committed Feb 06, 2009 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 /*===========================================================================*\ * * * OpenMesh * * Copyright (C) 2004 by Computer Graphics Group, RWTH Aachen * * www.openmesh.org * * * *---------------------------------------------------------------------------* * * * License * * * * This library 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, version 2.1. * * * * This library 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. * * * * You should have received a copy of the GNU Lesser General Public * * License along with this library; if not, write to the Free Software * * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * * \*===========================================================================*/ #ifndef OPENMESH_TRICONNECTIVITY_HH #define OPENMESH_TRICONNECTIVITY_HH #include namespace OpenMesh {  33 34 /** \brief Connectifity Class for Triangle Meshes */  Jan Möbius committed Feb 06, 2009 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 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 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 class TriConnectivity : public PolyConnectivity { public: TriConnectivity() {} virtual ~TriConnectivity() {} inline static bool is_triangles() { return true; } /** assign_connectivity() methods. See ArrayKernel::assign_connectivity() for more details. When the source connectivity is not triangles, in addition "fan" connectivity triangulation is performed*/ inline void assign_connectivity(const TriConnectivity& _other) { PolyConnectivity::assign_connectivity(_other); } inline void assign_connectivity(const PolyConnectivity& _other) { PolyConnectivity::assign_connectivity(_other); triangulate(); } /** \name Addding items to a mesh */ //@{ /** Override OpenMesh::Mesh::PolyMeshT::add_face(). Faces that aren't triangles will be triangulated and added. In this case an invalid face handle will be returned. */ FaceHandle add_face(const std::vector& _vhandles) { return add_face(&_vhandles.front(), _vhandles.size()); } FaceHandle add_face(const VertexHandle* _vhandles, uint _vhs_size); FaceHandle add_face(VertexHandle _vh0, VertexHandle _vh1, VertexHandle _vh2) { VertexHandle vhs[3] = { _vh0, _vh1, _vh2 }; return PolyConnectivity::add_face(vhs, 3); } //@} /** Returns the opposite vertex to the halfedge _heh in the face referenced by _heh returns InvalidVertexHandle if the _heh is boundary */ inline VertexHandle opposite_vh(HalfedgeHandle _heh) const { return is_boundary(_heh) ? InvalidVertexHandle : to_vertex_handle(next_halfedge_handle(_heh)); } /** Returns the opposite vertex to the opposite halfedge of _heh in the face referenced by it returns InvalidVertexHandle if the opposite halfedge is boundary */ VertexHandle opposite_he_opposite_vh(HalfedgeHandle _heh) const { return opposite_vh(opposite_halfedge_handle(_heh)); } /** \name Topology modifying operators */ //@{ /** Returns whether collapsing halfedge _heh is ok or would lead to topological inconsistencies. \attention This method need the Attributes::Status attribute and changes the \em tagged bit. */ bool is_collapse_ok(HalfedgeHandle _heh); /// Vertex Split: inverse operation to collapse(). HalfedgeHandle vertex_split(VertexHandle v0, VertexHandle v1, VertexHandle vl, VertexHandle vr); /// Check whether flipping _eh is topologically correct. bool is_flip_ok(EdgeHandle _eh) const; /** Flip edge _eh. Check for topological correctness first using is_flip_ok(). */ void flip(EdgeHandle _eh); /// Edge split (= 2-to-4 split) void split(EdgeHandle _eh, VertexHandle _vh); /// Face split (= 1-to-3 split, calls corresponding PolyMeshT function). inline void split(FaceHandle _fh, VertexHandle _vh) { PolyConnectivity::split(_fh, _vh); } //@} private: /// Helper for vertex split HalfedgeHandle insert_loop(HalfedgeHandle _hh); /// Helper for vertex split HalfedgeHandle insert_edge(VertexHandle _vh, HalfedgeHandle _h0, HalfedgeHandle _h1); }; } #endif//OPENMESH_TRICONNECTIVITY_HH