measure.cpp File Reference

#include "moab/CartVect.hpp"
#include "measure.hpp"

Include dependency graph for measure.cpp:

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Functions
static double	tet_volume (const CartVect &v0, const CartVect &v1, const CartVect &v2, const CartVect &v3)
double	edge_length (const double *start_vtx_coords, const double *end_vtx_coords)
double	measure (moab::EntityType type, int num_vertices, const double *vertex_coordinates)

Function Documentation

edge_length()

double edge_length	(	const double *	start_vtx_coords,
		const double *	end_vtx_coords
	)

Definition at line 35 of file measure.cpp.

   36 {
   37     const CartVect* start = reinterpret_cast< const CartVect* >( start_vtx_coords );
   38     const CartVect* end   = reinterpret_cast< const CartVect* >( end_vtx_coords );
   39     return ( *start - *end ).length();
   40 }

References moab::CartVect::length().

Referenced by gather_set_stats(), and moab::Intx2Mesh::intersect_meshes_kdtree().

measure()

double measure	(	moab::EntityType	type,
		int	num_vertices,
		const double *	vertex_coordinates
	)

Definition at line 42 of file measure.cpp.

   43 {
   44     const CartVect* coords = reinterpret_cast< const CartVect* >( vertex_coordinates );
   45     switch( type )
   46     {
   47         case moab::MBEDGE:
   48             return ( coords[0] - coords[1] ).length();
   49         case moab::MBTRI:
   50             return 0.5 * ( ( coords[1] - coords[0] ) * ( coords[2] - coords[0] ) ).length();
   51         case moab::MBQUAD:
   52             num_vertices = 4;
   53             // fall through
   54         case moab::MBPOLYGON: {
   55             CartVect mid( 0, 0, 0 );
   56             for( int i = 0; i < num_vertices; ++i )
   57                 mid += coords[i];
   58             mid /= num_vertices;
   59  
   60             double sum = 0.0;
   61             for( int i = 0; i < num_vertices; ++i )
   62             {
   63                 int j = ( i + 1 ) % num_vertices;
   64                 sum += ( ( mid - coords[i] ) * ( mid - coords[j] ) ).length();
   65             }
   66             return 0.5 * sum;
   67         }
   68         case moab::MBTET:
   69             return tet_volume( coords[0], coords[1], coords[2], coords[3] );
   70         case moab::MBPYRAMID:
   71             return tet_volume( coords[0], coords[1], coords[2], coords[4] ) +
   72                    tet_volume( coords[0], coords[2], coords[3], coords[4] );
   73         case moab::MBPRISM:
   74             return tet_volume( coords[0], coords[1], coords[2], coords[5] ) +
   75                    tet_volume( coords[3], coords[5], coords[4], coords[0] ) +
   76                    tet_volume( coords[1], coords[4], coords[5], coords[0] );
   77         case moab::MBHEX:
   78             return tet_volume( coords[0], coords[1], coords[3], coords[4] ) +
   79                    tet_volume( coords[7], coords[3], coords[6], coords[4] ) +
   80                    tet_volume( coords[4], coords[5], coords[1], coords[6] ) +
   81                    tet_volume( coords[1], coords[6], coords[3], coords[4] ) +
   82                    tet_volume( coords[2], coords[6], coords[3], coords[1] );
   83         default:
   84             return 0.0;
   85     }
   86 }

References length(), MBEDGE, MBHEX, MBPOLYGON, MBPRISM, MBPYRAMID, MBQUAD, MBTET, MBTRI, moab::sum(), and tet_volume().

tet_volume()

static double tet_volume ( const CartVect &  v0, const CartVect &  v1, const CartVect &  v2, const CartVect &  v3  )

inlinestatic

Definition at line 30 of file measure.cpp.

   31 {
   32     return 1. / 6. * ( ( ( v1 - v0 ) * ( v2 - v0 ) ) % ( v3 - v0 ) );
   33 }

Referenced by measure().