TriMeshT.hh

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//=============================================================================
//
//  CLASS TriMeshT
//
//=============================================================================


#ifndef OPENMESH_TRIMESH_HH
#define OPENMESH_TRIMESH_HH


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


#include <OpenMesh/Core/System/config.h>
#include <OpenMesh/Core/Mesh/PolyMeshT.hh>
#include <OpenMesh/Core/Mesh/Tags.hh>
#include <vector>


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


namespace OpenMesh {


//== CLASS DEFINITION =========================================================


template <class Kernel>
class TriMeshT : public PolyMeshT<Kernel>
{

public:


  // self
  typedef TriMeshT<Kernel>                      This;
  typedef PolyMeshT<Kernel>                     PolyMesh;

  static constexpr bool is_polymesh() { return false; }
  static constexpr bool is_trimesh()  { return true;  }
  using ConnectivityTag = TriConnectivityTag;
  enum { IsPolyMesh = 0 };
  enum { IsTriMesh  = 1 };

  //--- items ---

  typedef typename PolyMesh::Scalar             Scalar;
  typedef typename PolyMesh::Point              Point;
  typedef typename PolyMesh::Normal             Normal;
  typedef typename PolyMesh::Color              Color;
  typedef typename PolyMesh::TexCoord1D         TexCoord1D;
  typedef typename PolyMesh::TexCoord2D         TexCoord2D;
  typedef typename PolyMesh::TexCoord3D         TexCoord3D;
  typedef typename PolyMesh::Vertex             Vertex;
  typedef typename PolyMesh::Halfedge           Halfedge;
  typedef typename PolyMesh::Edge               Edge;
  typedef typename PolyMesh::Face               Face;


  //--- handles ---

  typedef typename PolyMesh::VertexHandle       VertexHandle;
  typedef typename PolyMesh::HalfedgeHandle     HalfedgeHandle;
  typedef typename PolyMesh::EdgeHandle         EdgeHandle;
  typedef typename PolyMesh::FaceHandle         FaceHandle;


  //--- iterators ---

  typedef typename PolyMesh::VertexIter         VertexIter;
  typedef typename PolyMesh::ConstVertexIter    ConstVertexIter;
  typedef typename PolyMesh::EdgeIter           EdgeIter;
  typedef typename PolyMesh::ConstEdgeIter      ConstEdgeIter;
  typedef typename PolyMesh::FaceIter           FaceIter;
  typedef typename PolyMesh::ConstFaceIter      ConstFaceIter;



  //--- circulators ---

  typedef typename PolyMesh::VertexVertexIter         VertexVertexIter;
  typedef typename PolyMesh::VertexOHalfedgeIter      VertexOHalfedgeIter;
  typedef typename PolyMesh::VertexIHalfedgeIter      VertexIHalfedgeIter;
  typedef typename PolyMesh::VertexEdgeIter           VertexEdgeIter;
  typedef typename PolyMesh::VertexFaceIter           VertexFaceIter;
  typedef typename PolyMesh::FaceVertexIter           FaceVertexIter;
  typedef typename PolyMesh::FaceHalfedgeIter         FaceHalfedgeIter;
  typedef typename PolyMesh::FaceEdgeIter             FaceEdgeIter;
  typedef typename PolyMesh::FaceFaceIter             FaceFaceIter;
  typedef typename PolyMesh::ConstVertexVertexIter    ConstVertexVertexIter;
  typedef typename PolyMesh::ConstVertexOHalfedgeIter ConstVertexOHalfedgeIter;
  typedef typename PolyMesh::ConstVertexIHalfedgeIter ConstVertexIHalfedgeIter;
  typedef typename PolyMesh::ConstVertexEdgeIter      ConstVertexEdgeIter;
  typedef typename PolyMesh::ConstVertexFaceIter      ConstVertexFaceIter;
  typedef typename PolyMesh::ConstFaceVertexIter      ConstFaceVertexIter;
  typedef typename PolyMesh::ConstFaceHalfedgeIter    ConstFaceHalfedgeIter;
  typedef typename PolyMesh::ConstFaceEdgeIter        ConstFaceEdgeIter;
  typedef typename PolyMesh::ConstFaceFaceIter        ConstFaceFaceIter;

  // --- constructor/destructor

  TriMeshT() : PolyMesh() {}
  explicit TriMeshT(PolyMesh rhs) : PolyMesh((rhs.triangulate(), rhs))
  {
  }

  virtual ~TriMeshT() {}

  //--- halfedge collapse / vertex split ---

  inline HalfedgeHandle vertex_split(Point _v0_point,  VertexHandle _v1,
                                     VertexHandle _vl, VertexHandle _vr)
  { return PolyMesh::vertex_split(this->add_vertex(_v0_point), _v1, _vl, _vr); }

  inline HalfedgeHandle vertex_split(VertexHandle _v0, VertexHandle _v1,
                                     VertexHandle _vl, VertexHandle _vr)
  { return PolyMesh::vertex_split(_v0, _v1, _vl, _vr); }

  inline VertexHandle split(EdgeHandle _eh, const Point& _p)
  {
    //Do not call PolyMeshT function below as this does the wrong operation
    const VertexHandle vh = this->add_vertex(_p); Kernel::split(_eh, vh); return vh;
  }

  inline VertexHandle split_copy(EdgeHandle _eh, const Point& _p)
  {
    //Do not call PolyMeshT function below as this does the wrong operation
    const VertexHandle vh = this->add_vertex(_p); Kernel::split_copy(_eh, vh); return vh;
  }

  inline void split(EdgeHandle _eh, VertexHandle _vh)
  {
    //Do not call PolyMeshT function below as this does the wrong operation
    Kernel::split(_eh, _vh);
  }

  inline void split_copy(EdgeHandle _eh, VertexHandle _vh)
  {
    //Do not call PolyMeshT function below as this does the wrong operation
    Kernel::split_copy(_eh, _vh);
  }

  inline VertexHandle split(FaceHandle _fh, const Point& _p)
  { const VertexHandle vh = this->add_vertex(_p); PolyMesh::split(_fh, vh); return vh; }

  inline VertexHandle split_copy(FaceHandle _fh, const Point& _p)
  { const VertexHandle vh = this->add_vertex(_p);  PolyMesh::split_copy(_fh, vh); return vh; }


  inline void split(FaceHandle _fh)
  {
    // Collect halfedges of face
    HalfedgeHandle he0 = this->halfedge_handle(_fh);
    HalfedgeHandle he1 = this->next_halfedge_handle(he0);
    HalfedgeHandle he2 = this->next_halfedge_handle(he1);

    EdgeHandle eh0 = this->edge_handle(he0);
    EdgeHandle eh1 = this->edge_handle(he1);
    EdgeHandle eh2 = this->edge_handle(he2);

    // Collect points of face
    VertexHandle p0 = this->to_vertex_handle(he0);
    VertexHandle p1 = this->to_vertex_handle(he1);
    VertexHandle p2 = this->to_vertex_handle(he2);

    // Calculate midpoint coordinates
    const Point new0 = (this->point(p0) + this->point(p2)) * static_cast<typename vector_traits<Point>::value_type >(0.5);
    const Point new1 = (this->point(p0) + this->point(p1)) * static_cast<typename vector_traits<Point>::value_type >(0.5);
    const Point new2 = (this->point(p1) + this->point(p2)) * static_cast<typename vector_traits<Point>::value_type >(0.5);

    // Add vertices at midpoint coordinates
    VertexHandle v0 = this->add_vertex(new0);
    VertexHandle v1 = this->add_vertex(new1);
    VertexHandle v2 = this->add_vertex(new2);

    const bool split0 = !this->is_boundary(eh0);
    const bool split1 = !this->is_boundary(eh1);
    const bool split2 = !this->is_boundary(eh2);

    // delete original face
    this->delete_face(_fh);

    // split boundary edges of deleted face ( if not boundary )
    if ( split0 ) {
      this->split(eh0,v0);
    }

    if ( split1 ) {
      this->split(eh1,v1);
    }

    if ( split2 ) {
      this->split(eh2,v2);
    }

    // Retriangulate
    this->add_face(v0 , p0, v1);
    this->add_face(p2, v0 , v2);
    this->add_face(v2,v1,p1);
    this->add_face(v2 , v0, v1);
  }

  inline void split(FaceHandle _fh, VertexHandle _vh)
  { PolyMesh::split(_fh, _vh); }

  inline void split_copy(FaceHandle _fh, VertexHandle _vh)
  { PolyMesh::split_copy(_fh, _vh); }
  

  Normal calc_face_normal(FaceHandle _fh) const;

};


//=============================================================================
} // namespace OpenMesh
//=============================================================================
#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_TRIMESH_C)
#define OPENMESH_TRIMESH_TEMPLATES
#include "TriMeshT_impl.hh"
#endif
//=============================================================================
#endif // OPENMESH_TRIMESH_HH defined
//=============================================================================