field_interpolated_p0.impl.hh

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/*!
 *
 * Copyright (C) 2015 Technical University of Liberec.  All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
 * Free Software Foundation. (http://www.gnu.org/licenses/gpl-3.0.en.html)
 * 
 * This program 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 General Public License for more details.
 *
 * 
 * @file    field_interpolated_p0.impl.hh
 * @brief   
 */

#ifndef FIELD_INTERPOLATED_P0_IMPL_HH_
#define FIELD_INTERPOLATED_P0_IMPL_HH_

#include "field_interpolated_p0.hh"
#include "system/system.hh"
#include "mesh/msh_gmshreader.h"
#include "mesh/bih_tree.hh"
#include "mesh/reader_instances.hh"
#include "mesh/ngh/include/intersection.h"
#include "mesh/ngh/include/point.h"
#include "system/sys_profiler.hh"


namespace it = Input::Type;

FLOW123D_FORCE_LINK_IN_CHILD(field_interpolated)



template <int spacedim, class Value>
const Input::Type::Record & FieldInterpolatedP0<spacedim, Value>::get_input_type()
{
    return it::Record("FieldInterpolatedP0", FieldAlgorithmBase<spacedim,Value>::template_name()+" Field constant in space.")
        .derive_from(FieldAlgorithmBase<spacedim, Value>::get_input_type())
        .declare_key("gmsh_file", IT::FileName::input(), IT::Default::obligatory(),
                "Input file with ASCII GMSH file format.")
        .declare_key("field_name", IT::String(), IT::Default::obligatory(),
                "The values of the Field are read from the ```$ElementData``` section with field name given by this key.")
        .close();
}



template <int spacedim, class Value>
const int FieldInterpolatedP0<spacedim, Value>::registrar =
        Input::register_class< FieldInterpolatedP0<spacedim, Value>, unsigned int >("FieldInterpolatedP0") +
        FieldInterpolatedP0<spacedim, Value>::get_input_type().size();


template <int spacedim, class Value>
FieldInterpolatedP0<spacedim, Value>::FieldInterpolatedP0(const unsigned int n_comp)
: FieldAlgorithmBase<spacedim, Value>(n_comp)
{}



template <int spacedim, class Value>
void FieldInterpolatedP0<spacedim, Value>::init_from_input(const Input::Record &rec) {

    // read mesh, create tree
    {
       source_mesh_ = new Mesh();
       reader_file_ = FilePath( rec.val<FilePath>("gmsh_file") );
       ReaderInstances::instance()->get_reader(reader_file_)->read_mesh( source_mesh_ );
       // no call to mesh->setup_topology, we need only elements, no connectivity
    }
    bih_tree_ = new BIHTree( source_mesh_ );

    // allocate data_
    unsigned int data_size = source_mesh_->element.size() * (this->value_.n_rows() * this->value_.n_cols());
    data_ = std::make_shared<std::vector<typename Value::element_type>>();
    data_->resize(data_size);

    field_name_ = rec.val<std::string>("field_name");
}




template <int spacedim, class Value>
bool FieldInterpolatedP0<spacedim, Value>::set_time(const TimeStep &time) {
    OLD_ASSERT(source_mesh_, "Null mesh pointer of elementwise field: %s, did you call init_from_input(Input::Record)?\n", field_name_.c_str());
    if ( reader_file_ == FilePath() ) return false;
    
    //walkaround for the steady time governor - there is no data to be read in time==infinity
    //TODO: is it possible to check this before calling set_time?
    //if (time == numeric_limits< double >::infinity()) return false;
    
    // value of last computed element must be recalculated if time is changed
    computed_elm_idx_ = numeric_limits<unsigned int>::max();

    GMSH_DataHeader search_header;
    search_header.actual = false;
    search_header.field_name = field_name_;
    search_header.n_components = this->value_.n_rows() * this->value_.n_cols();
    search_header.n_entities = source_mesh_->element.size();
    search_header.time = time.end();
    
    bool boundary_domain_ = false;
    data_ = ReaderInstances::instance()->get_reader(reader_file_)->get_element_data<typename Value::element_type>(search_header,
            source_mesh_->elements_id_maps(boundary_domain_), this->component_idx_);

    return search_header.actual;
}



template <int spacedim, class Value>
typename Value::return_type const &FieldInterpolatedP0<spacedim, Value>::value(const Point &p, const ElementAccessor<spacedim> &elm)
{
    OLD_ASSERT( elm.is_elemental(), "FieldInterpolatedP0 works only for 'elemental' ElementAccessors.\n");
    if (elm.idx() != computed_elm_idx_ || elm.is_boundary() != computed_elm_boundary_) {
        computed_elm_idx_ = elm.idx();
        computed_elm_boundary_ = elm.is_boundary();

        if (elm.dim() == 3) {
            xprintf(Err, "Dimension of element in target mesh must be 0, 1 or 2! elm.idx() = %d\n", elm.idx());
        }

        double epsilon = 4* numeric_limits<double>::epsilon() * elm.element()->measure();

        // gets suspect elements
        if (elm.dim() == 0) {
            searched_elements_.clear();
            ((BIHTree *)bih_tree_)->find_point(elm.element()->node[0]->point(), searched_elements_);
        } else {
            BoundingBox bb;
            elm.element()->get_bounding_box(bb);
            searched_elements_.clear();
            ((BIHTree *)bih_tree_)->find_bounding_box(bb, searched_elements_);
        }

        // set zero values of value_ object
        for (unsigned int i=0; i < this->value_.n_rows(); i++) {
            for (unsigned int j=0; j < this->value_.n_cols(); j++) {
                this->value_(i,j) = 0.0;
            }
        }

        double total_measure=0.0, measure;
        TIntersectionType iType;

        START_TIMER("compute_pressure");
        ADD_CALLS(searched_elements_.size());
        for (std::vector<unsigned int>::iterator it = searched_elements_.begin(); it!=searched_elements_.end(); it++)
        {
            ElementFullIter ele = source_mesh_->element( *it );
            if (ele->dim() == 3) {
                ngh::set_tetrahedron_from_element(tetrahedron_, ele);
                // get intersection (set measure = 0 if intersection doesn't exist)
                switch (elm.dim()) {
                    case 0: {
                        ngh::set_point_from_element(point_, elm.element());
                        if ( tetrahedron_.IsInner(point_) ) {
                            measure = 1.0;
                        } else {
                            measure = 0.0;
                        }
                        break;
                    }
                    case 1: {
                        ngh::set_abscissa_from_element(abscissa_, elm.element());
                        GetIntersection(abscissa_, tetrahedron_, iType, measure);
                        if (iType != line) {
                            measure = 0.0;
                        }
                        break;
                    }
                    case 2: {
                        ngh::set_triangle_from_element(triangle_, elm.element());
                        GetIntersection(triangle_, tetrahedron_, iType, measure);
                        if (iType != area) {
                            measure = 0.0;
                        }
                        break;
                    }
                }



                //adds values to value_ object if intersection exists
                if (measure > epsilon) {
                    unsigned int index = this->value_.n_rows() * this->value_.n_cols() * (*it);
                    std::vector<typename Value::element_type> &vec = *( data_.get() );
                    typename Value::return_type & ret_type_value = const_cast<typename Value::return_type &>( Value::from_raw(this->r_value_,  (typename Value::element_type *)(&vec[index])) );
                    Value tmp_value = Value( ret_type_value );

                    for (unsigned int i=0; i < this->value_.n_rows(); i++) {
                        for (unsigned int j=0; j < this->value_.n_cols(); j++) {
                            this->value_(i,j) += tmp_value(i,j) * measure;
                        }
                    }
                    total_measure += measure;
                }
            }
        }

        // computes weighted average
        if (total_measure > epsilon) {
            for (unsigned int i=0; i < this->value_.n_rows(); i++) {
                for (unsigned int j=0; j < this->value_.n_cols(); j++) {
                    this->value_(i,j) /= total_measure;
                }
            }
        } else {
            WarningOut().fmt("Processed element with idx {} is out of source mesh!\n", elm.idx());
        }
        END_TIMER("compute_pressure");

    }
    return this->r_value_;
}



template <int spacedim, class Value>
void FieldInterpolatedP0<spacedim, Value>::value_list(const std::vector< Point >  &point_list, const ElementAccessor<spacedim> &elm,
                       std::vector<typename Value::return_type>  &value_list)
{
    OLD_ASSERT( elm.is_elemental(), "FieldInterpolatedP0 works only for 'elemental' ElementAccessors.\n");
    FieldAlgorithmBase<spacedim, Value>::value_list(point_list, elm, value_list);
}





#endif /* FIELD_INTERPOLATED_P0_IMPL_HH_ */