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// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
// -*- tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_PYTHON_GRID_FACTORY_HH
#define DUNE_PYTHON_GRID_FACTORY_HH
#include <cstddef>
#include <memory>
#include <sstream>
#include <stdexcept>
#include <string>
#include <vector>
#include <dune/common/visibility.hh>
#include <dune/common/fvector.hh>
#include <dune/geometry/referenceelements.hh>
#include <dune/geometry/type.hh>
#include <dune/grid/common/boundarysegment.hh>
#include <dune/grid/common/gridfactory.hh>
#include <dune/python/grid/capabilities.hh>
#include <dune/python/grid/gridview.hh>
#include <dune/python/pybind11/extensions.h>
#include <dune/python/pybind11/functional.h>
#include <dune/python/pybind11/numpy.h>
#include <dune/python/pybind11/pybind11.h>
#include <dune/python/pybind11/stl.h>
namespace Dune
{
namespace Python
{
// BoundarySegment
// ---------------
template< int dim, int dimworld >
struct DUNE_PRIVATE BoundarySegment final
: public Dune::BoundarySegment< dim, dimworld >
{
explicit BoundarySegment ( pybind11::function parametrization )
: parametrization_( std::move( parametrization ) )
{}
FieldVector< double, dimworld > operator() ( const FieldVector< double, dim-1 > &local ) const
{
return parametrization_( local ).template cast< FieldVector< double, dimworld > >();
}
private:
pybind11::function parametrization_;
};
namespace detail
{
namespace GridFactory
{
// insertVertices
// --------------
template< class T, class Grid >
inline static void insertVertices ( const pybind11::buffer_info &info, pybind11::format_descriptor< T >, Dune::GridFactory< Grid > &factory )
{
const int dimWorld = Grid::dimensionworld;
for( int i = 0; i < info.shape[ 0 ]; ++i )
{
const std::size_t offset = i * (info.strides[ 0 ] / sizeof( T ));
FieldVector< typename Grid::ctype, dimWorld > x;
for( int j = 0; j < dimWorld; ++j )
x[ j ] = static_cast< T * >( info.ptr )[ offset + j * (info.strides[ 1 ] / sizeof( T )) ];
factory.insertVertex( x );
}
}
template< class Grid >
inline static void insertVertices ( const pybind11::buffer_info &info, Dune::GridFactory< Grid > &factory )
{
const int dimWorld = Grid::dimensionworld;
if( (info.ndim != 2) || (info.shape[ 1 ] != dimWorld) )
throw std::invalid_argument( "vertex array must be of shape (*, " + std::to_string( dimWorld ) + ")" );
pybind11::handle_buffer_format(info, [ &info, &factory ] ( auto format ) { insertVertices( info, format, factory ); } );
}
template< class Grid >
inline static void insertVertices ( pybind11::list data, Dune::GridFactory< Grid > &factory )
{
typedef FieldVector< typename Grid::ctype, Grid::dimensionworld > GlobalCoordinate;
for( pybind11::handle item : data )
factory.insertVertex( item.template cast< GlobalCoordinate >() );
}
template< class Grid >
inline static void insertVertices ( pybind11::detail::item_accessor data, Dune::GridFactory< Grid > &factory )
{
try
{
insertVertices( data.template cast< pybind11::buffer >().request(), factory );
return;
}
catch (const pybind11::type_error &)
{}
try
{
insertVertices( data.template cast< pybind11::list >(), factory );
return;
}
catch( const pybind11::cast_error & )
{}
throw std::invalid_argument( "Incompatible array type for vertices." );
}
// insertElements
// --------------
template< class T, class Grid >
inline static std::enable_if_t< std::is_integral< T >::value >
insertElements ( GeometryType type, const pybind11::buffer_info &info, pybind11::format_descriptor< T >, Dune::GridFactory< Grid > &factory )
{
const int dimGrid = Grid::dimension;
const int numVertices = ReferenceElements< typename Grid::ctype, dimGrid >::general( type ).size( dimGrid );
if( (info.ndim != 2) || (info.shape[ 1 ] != numVertices) )
{
std::ostringstream msg;
msg << "buffer for geometry type " << type << " must be of shape (*, " << numVertices << ")\n";
if (info.ndim != 2)
msg << " shape dimension is not 2 but " << info.ndim;
else
msg << " shape dimension is 2 but shape[1] is " << info.shape[ 1 ];
throw std::invalid_argument( msg.str() );
}
std::vector< unsigned int > vertices( numVertices );
for( int i = 0; i < info.shape[ 0 ]; ++i )
{
const std::size_t offset = i * (info.strides[ 0 ] / sizeof( T ));
for( int j = 0; j < numVertices; ++j )
vertices[ j ] = static_cast< T * >( info.ptr )[ offset + j * (info.strides[ 1 ] / sizeof( T )) ];
factory.insertElement( type, vertices );
}
}
template< class T, class Grid >
inline static std::enable_if_t< !std::is_integral< T >::value >
insertElements ( GeometryType type, const pybind11::buffer_info &info, pybind11::format_descriptor< T >, Dune::GridFactory< Grid > &factory )
{
std::ostringstream msg;
msg << "Incompatible buffer format in array for geometry type " << type << ": '" << info.format << "'.";
throw std::invalid_argument( msg.str() );
}
template< class Grid >
inline static void insertElements ( GeometryType type, const pybind11::buffer_info &info, Dune::GridFactory< Grid > &factory )
{
pybind11::handle_buffer_format( info, [ type, &info, &factory ] ( auto format ) { insertElements( type, info, format, factory ); } );
}
template< class Grid >
inline static void insertElements ( GeometryType type, const pybind11::list &data, Dune::GridFactory< Grid > &factory )
{
for( pybind11::handle item : data )
factory.insertElement( type, item.template cast< std::vector< unsigned int > >() );
}
template< class Grid >
inline static void insertElements ( GeometryType type, pybind11::detail::item_accessor data, Dune::GridFactory< Grid > &factory )
{
try
{
insertElements( type, data.template cast< pybind11::buffer >().request(), factory );
return;
}
catch (const pybind11::type_error &)
{}
try
{
insertElements( type, data.template cast< pybind11::list >(), factory );
return;
}
catch( const pybind11::cast_error & )
{}
std::ostringstream msg;
msg << "Invalid array type for geometry type " << type << ".";
throw std::invalid_argument( msg.str() );
}
template< class Grid >
inline static void insertElements ( pybind11::list data, Dune::GridFactory< Grid > &factory )
{
for( pybind11::handle hItem : data )
{
auto item = pybind11::reinterpret_borrow< pybind11::tuple >( hItem );
if( item.size() == 2 )
factory.insertElement( pybind11::cast< GeometryType >( item[ 0 ] ), pybind11::cast< std::vector< unsigned int > >( item[ 1 ] ) );
else
throw std::invalid_argument( "Element tuple must be of length 2." );
}
}
template< class Grid >
inline static void insertElements ( pybind11::detail::item_accessor data, Dune::GridFactory< Grid > &factory )
{
insertElements( pybind11::cast< pybind11::list >( data ), factory );
}
// insertBoundaries
// ----------------
template< class Grid >
inline static void insertBoundaries ( pybind11::list data, Dune::GridFactory< Grid > &factory )
{
const int dimGrid = Grid::dimension;
const int dimWorld = Grid::dimensionworld;
for( pybind11::handle item : data )
{
auto vertices = item.template cast< std::vector< unsigned int > >();
pybind11::function f;
try
{
f = item.template cast< pybind11::function >();
}
catch( const pybind11::cast_error & )
{}
if( f )
factory.insertBoundarySegment( vertices, std::make_shared< BoundarySegment< dimGrid, dimWorld > >( f ) );
else
factory.insertBoundarySegment( vertices );
}
}
template< class Grid >
inline static void insertBoundaries ( pybind11::detail::item_accessor data, Dune::GridFactory< Grid > &factory )
{
insertBoundaries( pybind11::cast< pybind11::list >( data ), factory );
}
} // namespace GridFactory
} // namespace detail
// fillGridFactory
// ---------------
template< class Grid >
inline void fillGridFactory ( const pybind11::dict &dict, Dune::GridFactory< Grid > &factory )
{
const int dimGrid = Grid::dimension;
if( dict.contains( "vertices" ) )
detail::GridFactory::insertVertices( dict[ "vertices" ], factory );
else
throw std::invalid_argument( "Missing Key: 'vertices'" );
if( dict.contains( "elements" ) )
detail::GridFactory::insertElements( dict[ "elements" ], factory );
if( dict.contains( "lines" ) )
detail::GridFactory::insertElements( GeometryTypes::line, dict[ "lines" ], factory );
if( dict.contains( "line" ) )
detail::GridFactory::insertElements( GeometryTypes::line, dict[ "line" ], factory );
if( dict.contains( "triangles" ) )
detail::GridFactory::insertElements( GeometryTypes::triangle, dict[ "triangles" ], factory );
if( dict.contains( "triangle" ) )
detail::GridFactory::insertElements( GeometryTypes::triangle, dict[ "triangles" ], factory );
if( dict.contains( "tetrahedra" ) )
detail::GridFactory::insertElements( GeometryTypes::tetrahedron, dict[ "tetrahedra" ], factory );
if( dict.contains( "simplices" ) )
detail::GridFactory::insertElements( GeometryTypes::simplex( dimGrid ), dict[ "simplices" ], factory );
if( dict.contains( "tetra" ) )
{
std::cout << "reading tetras\n";
detail::GridFactory::insertElements( GeometryTypes::simplex( dimGrid ), dict[ "tetra" ], factory );
}
if( dict.contains( "quadrilaterals" ) )
detail::GridFactory::insertElements( GeometryTypes::quadrilateral, dict[ "quadrilaterals" ], factory );
if( dict.contains( "hexahedra" ) )
detail::GridFactory::insertElements( GeometryTypes::hexahedron, dict[ "hexahedra" ], factory );
if( dict.contains( "cubes" ) )
detail::GridFactory::insertElements( GeometryTypes::cube( dimGrid ), dict[ "cubes" ], factory );
if( dict.contains( "prisms" ) )
detail::GridFactory::insertElements( GeometryTypes::prism, dict[ "prisms" ], factory );
if( dict.contains( "pyramid" ) )
detail::GridFactory::insertElements( GeometryTypes::prism, dict[ "pyramids" ], factory );
if( dict.contains( "boundaries" ) )
detail::GridFactory::insertBoundaries( dict[ "boundaries" ], factory );
}
} // namespace Python
} // namespace Dune
#endif // #ifndef DUNE_PYTHON_GRID_FACTORY_HH
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