SweptElementData.hpp

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/**
 * MOAB, a Mesh-Oriented datABase, is a software component for creating,
 * storing and accessing finite element mesh data.
 *
 * Copyright 2004 Sandia Corporation. Under the terms of Contract
 * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
 * retains certain rights in this software.
 *
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 */
 
#ifndef SWEPT_ELEMENT_DATA_HPP
#define SWEPT_ELEMENT_DATA_HPP
 
//
// Class: SweptElementData
//
// Purpose: represent a rectangular element of mesh
//
// A SweptElement represents a rectangular element of mesh, including both vertices and
// elements, and the parametric space used to address that element. Vertex data,
// i.e. coordinates, may not be stored directly in the element, but the element returns
// information about the vertex handles of vertices in the element. Vertex and element
// handles associated with the element are each contiguous.
 
#include "SequenceData.hpp"
#include "moab/HomXform.hpp"
#include "moab/CN.hpp"
#include "SweptVertexData.hpp"
#include "Internals.hpp"
#include "moab/Range.hpp"
 
#include <vector>
#include <algorithm>
 
namespace moab
{
 
class SweptElementData : public SequenceData
{
 
 //! structure to hold references to bounding vertex blocks
 class VertexDataRef
 {
 private:
 HomCoord minmax[2];
 HomXform xform, invXform;
 SweptVertexData* srcSeq;
 
 public:
 friend class SweptElementData;
 
 VertexDataRef( const HomCoord& min, const HomCoord& max, const HomXform& tmp_xform, SweptVertexData* this_seq );
 
 bool contains( const HomCoord& coords ) const;
 };
 
 private:
 //! parameter min/max/stride, in homogeneous coords ijkh
 HomCoord elementParams[3];
 
 //! difference between max and min params plus one (i.e. # VERTICES in
 //! each parametric direction)
 int dIJK[3];
 
 //! difference between max and min params (i.e. # ELEMENTS in
 //! each parametric direction)
 int dIJKm1[3];
 
 //! bare constructor, so compiler doesn't create one for me
 SweptElementData();
 
 //! list of bounding vertex blocks
 std::vector< VertexDataRef > vertexSeqRefs;
 
 public:
 //! constructor
 SweptElementData( EntityHandle start_handle,
 const int imin,
 const int jmin,
 const int kmin,
 const int imax,
 const int jmax,
 const int kmax,
 const int* Cq );
 
 virtual ~SweptElementData();
 
 //! get handle of vertex at homogeneous coords
 inline EntityHandle get_vertex( const HomCoord& coords ) const;
 inline EntityHandle get_vertex( int i, int j, int k ) const
 {
 return get_vertex( HomCoord( i, j, k ) );
 }
 
 //! get handle of element at i, j, k
 EntityHandle get_element( const int i, const int j, const int k ) const;
 
 //! get min params for this element
 const HomCoord& min_params() const;
 
 //! get max params for this element
 const HomCoord& max_params() const;
 
 //! get the number of vertices in each direction, inclusive
 void param_extents( int& di, int& dj, int& dk ) const;
 
 //! given a handle, get the corresponding parameters
 ErrorCode get_params( const EntityHandle ehandle, int& i, int& j, int& k ) const;
 
 //! convenience functions for parameter extents
 int i_min() const
 {
 return ( elementParams[0].hom_coord() )[0];
 }
 int j_min() const
 {
 return ( elementParams[0].hom_coord() )[1];
 }
 int k_min() const
 {
 return ( elementParams[0].hom_coord() )[2];
 }
 int i_max() const
 {
 return ( elementParams[1].hom_coord() )[0];
 }
 int j_max() const
 {
 return ( elementParams[1].hom_coord() )[1];
 }
 int k_max() const
 {
 return ( elementParams[1].hom_coord() )[2];
 }
 
 //! test the bounding vertex sequences and determine whether they fully
 //! define the vertices covering this element block's parameter space
 bool boundary_complete() const;
 
 //! test whether this sequence contains these parameters
 inline bool contains( const HomCoord& coords ) const;
 
 //! get connectivity of an entity given entity's parameters
 inline ErrorCode get_params_connectivity( const int i,
 const int j,
 const int k,
 std::vector< EntityHandle >& connectivity ) const;
 
 //! add a vertex seq ref to this element sequence;
 //! if bb_input is true, bounding box (in eseq-local coords) of vseq being added
 //! is input in bb_min and bb_max (allows partial sharing of vseq rather than the whole
 //! vseq); if it's false, the whole vseq is referenced and the eseq-local coordinates
 //! is computed from the transformed bounding box of the vseq
 ErrorCode add_vsequence( SweptVertexData* vseq,
 const HomCoord& p1,
 const HomCoord& q1,
 const HomCoord& p2,
 const HomCoord& q2,
 const HomCoord& p3,
 const HomCoord& q3,
 bool bb_input = false,
 const HomCoord& bb_min = HomCoord::unitv[0],
 const HomCoord& bb_max = HomCoord::unitv[0] );
 
 SequenceData* subset( EntityHandle start,
 EntityHandle end,
 const int* sequence_data_sizes,
 const int* tag_data_sizes ) const;
 
 static EntityID calc_num_entities( EntityHandle start_handle, int irange, int jrange, int krange );
 
 unsigned long get_memory_use() const;
};
 
inline EntityHandle SweptElementData::get_element( const int i, const int j, const int k ) const
{
 return start_handle() + ( i - i_min() ) + ( j - j_min() ) * dIJKm1[0] + ( k - k_min() ) * dIJKm1[0] * dIJKm1[1];
}
 
inline const HomCoord& SweptElementData::min_params() const
{
 return elementParams[0];
}
 
inline const HomCoord& SweptElementData::max_params() const
{
 return elementParams[1];
}
 
//! get the number of vertices in each direction, inclusive
inline void SweptElementData::param_extents( int& di, int& dj, int& dk ) const
{
 di = dIJK[0];
 dj = dIJK[1];
 dk = dIJK[2];
}
 
inline ErrorCode SweptElementData::get_params( const EntityHandle ehandle, int& i, int& j, int& k ) const
{
 if( TYPE_FROM_HANDLE( ehandle ) != TYPE_FROM_HANDLE( start_handle() ) ) return MB_FAILURE;
 
 int hdiff = ehandle - start_handle();
 
 // use double ?: test below because on some platforms, both sides of the : are
 // evaluated, and if dIJKm1[1] is zero, that'll generate a divide-by-zero
 k = ( dIJKm1[1] > 0 ? hdiff / ( dIJKm1[1] > 0 ? dIJKm1[0] * dIJKm1[1] : 1 ) : 0 );
 j = ( hdiff - ( k * dIJKm1[0] * dIJKm1[1] ) ) / dIJKm1[0];
 i = hdiff % dIJKm1[0];
 
 k += elementParams[0].k();
 j += elementParams[0].j();
 i += elementParams[0].i();
 
 return ( ehandle >= start_handle() && ehandle < start_handle() + size() && i >= i_min() && i <= i_max() &&
 j >= j_min() && j <= j_max() && k >= k_min() && k <= k_max() )
 ? MB_SUCCESS
 : MB_FAILURE;
}
 
inline bool SweptElementData::contains( const HomCoord& temp ) const
{
 // upper bound is < instead of <= because element params max is one less
 // than vertex params max
 return ( temp >= elementParams[0] && temp < elementParams[1] );
}
 
inline bool SweptElementData::VertexDataRef::contains( const HomCoord& coords ) const
{
 return ( minmax[0] <= coords && minmax[1] >= coords );
}
 
inline SweptElementData::VertexDataRef::VertexDataRef( const HomCoord& this_min,
 const HomCoord& this_max,
 const HomXform& tmp_xform,
 SweptVertexData* this_seq )
 : xform( tmp_xform ), invXform( tmp_xform.inverse() ), srcSeq( this_seq )
{
 minmax[0] = HomCoord( this_min );
 minmax[1] = HomCoord( this_max );
}
 
inline EntityHandle SweptElementData::get_vertex( const HomCoord& coords ) const
{
 assert( boundary_complete() );
 for( std::vector< VertexDataRef >::const_iterator it = vertexSeqRefs.begin(); it != vertexSeqRefs.end(); ++it )
 {
 if( ( *it ).minmax[0] <= coords && ( *it ).minmax[1] >= coords )
 {
 // first get the vertex block-local parameters
 HomCoord local_coords = coords / ( *it ).xform;
 
 // now get the vertex handle for those coords
 return ( *it ).srcSeq->get_vertex( local_coords );
 }
 }
 
 // got here, it's an error
 return 0;
}
 
inline ErrorCode SweptElementData::add_vsequence( SweptVertexData* vseq,
 const HomCoord& p1,
 const HomCoord& q1,
 const HomCoord& p2,
 const HomCoord& q2,
 const HomCoord& p3,
 const HomCoord& q3,
 bool bb_input,
 const HomCoord& bb_min,
 const HomCoord& bb_max )
{
 // compute the transform given the vseq-local parameters and the mapping to
 // this element sequence's parameters passed in minmax
 HomXform M;
 M.three_pt_xform( p1, q1, p2, q2, p3, q3 );
 
 // min and max in element seq's parameter system may not be same as those in
 // vseq's system, so need to take min/max
 
 HomCoord minmax[2];
 if( bb_input )
 {
 minmax[0] = bb_min;
 minmax[1] = bb_max;
 }
 else
 {
 minmax[0] = vseq->min_params() * M;
 minmax[1] = vseq->max_params() * M;
 }
 
 // check against other vseq's to make sure they don't overlap
 for( std::vector< VertexDataRef >::const_iterator vsit = vertexSeqRefs.begin(); vsit != vertexSeqRefs.end();
 ++vsit )
 if( ( *vsit ).contains( minmax[0] ) || ( *vsit ).contains( minmax[1] ) ) return MB_FAILURE;
 
 HomCoord tmp_min( std::min( minmax[0].i(), minmax[1].i() ), std::min( minmax[0].j(), minmax[1].j() ),
 std::min( minmax[0].k(), minmax[1].k() ) );
 HomCoord tmp_max( std::max( minmax[0].i(), minmax[1].i() ), std::max( minmax[0].j(), minmax[1].j() ),
 std::max( minmax[0].k(), minmax[1].k() ) );
 
 // set up a new vertex sequence reference
 VertexDataRef tmp_seq_ref( tmp_min, tmp_max, M, vseq );
 
 // add to the list
 vertexSeqRefs.push_back( tmp_seq_ref );
 
 return MB_SUCCESS;
}
 
inline ErrorCode SweptElementData::get_params_connectivity( const int i,
 const int j,
 const int k,
 std::vector< EntityHandle >& connectivity ) const
{
 if( contains( HomCoord( i, j, k ) ) == false ) return MB_FAILURE;
 
 connectivity.push_back( get_vertex( i, j, k ) );
 connectivity.push_back( get_vertex( i + 1, j, k ) );
 if( CN::Dimension( TYPE_FROM_HANDLE( start_handle() ) ) < 2 ) return MB_SUCCESS;
 connectivity.push_back( get_vertex( i + 1, j + 1, k ) );
 connectivity.push_back( get_vertex( i, j + 1, k ) );
 if( CN::Dimension( TYPE_FROM_HANDLE( start_handle() ) ) < 3 ) return MB_SUCCESS;
 connectivity.push_back( get_vertex( i, j, k + 1 ) );
 connectivity.push_back( get_vertex( i + 1, j, k + 1 ) );
 connectivity.push_back( get_vertex( i + 1, j + 1, k + 1 ) );
 connectivity.push_back( get_vertex( i, j + 1, k + 1 ) );
 return MB_SUCCESS;
}
 
} // namespace moab
 
#endif