field_interpolated_p0.cc

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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.cc
 * @brief   
 */
 
 
#include "field_interpolated_p0.hh"
#include "fields/field_instances.hh"    // for instantiation macros
#include "system/system.hh"
#include "io/msh_gmshreader.h"
#include "mesh/bih_tree.hh"
#include "mesh/accessors.hh"
#include "io/reader_cache.hh"
#include "system/sys_profiler.hh"
 
#include "fem/mapping_p1.hh"
 
#include "intersection/intersection_aux.hh"
#include "intersection/intersection_local.hh"
#include "intersection/compute_intersection.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 interpolated from external mesh data and piecewise constant on mesh elements.")
        .derive_from(FieldAlgorithmBase<spacedim, Value>::get_input_type())
        .copy_keys(FieldAlgorithmBase<spacedim, Value>::get_field_algo_common_keys())
        .declare_key("mesh_data_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.")
        //.declare_key("unit", FieldAlgorithmBase<spacedim, Value>::get_input_type_unit_si(), it::Default::optional(),
        //      "Definition of unit.")
        .declare_key("default_value", IT::Double(), IT::Default::optional(),
                "Allow set default value of elements that have not listed values in mesh data file.")
        .declare_key("time_unit", IT::String(), IT::Default::read_time("Common unit of TimeGovernor."),
                "Definition of unit of all times defined in mesh data file.")
        .declare_key("read_time_shift", TimeGovernor::get_input_time_type(), IT::Default("0.0"),
                "Allow set time shift of field data read from the mesh data file. For time 't', field descriptor with time 'T', "
                "time shift 'S' and if 't > T', we read time frame 't + S'.")
        .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)
{
    this->is_constant_in_space_ = false;
}
 
 
 
template <int spacedim, class Value>
void FieldInterpolatedP0<spacedim, Value>::init_from_input(const Input::Record &rec, const struct FieldAlgoBaseInitData& init_data) {
    this->init_unit_conversion_coefficient(rec, init_data);
    this->in_rec_ = rec;
 
 
    // read mesh, create tree
    {
       reader_file_ = FilePath( rec.val<FilePath>("mesh_data_file") );
       source_mesh_ = ReaderCache::get_mesh(reader_file_ );
       //source_mesh_->setup_topology();
       ReaderCache::check_compatible_mesh(reader_file_, *source_mesh_);
    }
    bih_tree_ = new BIHTree();
    bih_tree_->add_boxes( source_mesh_->get_element_boxes() );
    bih_tree_->construct();
 
    // allocate data_
    unsigned int data_size = source_mesh_->n_elements() * (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");
    if (!rec.opt_val("default_value", default_value_) ) {
        default_value_ = numeric_limits<double>::signaling_NaN();
    }
}
 
 
 
 
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();
 
    bool boundary_domain_ = false;
    double time_unit_coef = time.read_coef(in_rec_.find<string>("time_unit"));
    double time_shift = time.read_time( in_rec_.find<Input::Tuple>("read_time_shift") );
    double read_time = (time.end()+time_shift) / time_unit_coef;
    BaseMeshReader::HeaderQuery header_query(field_name_, read_time, OutputTime::DiscreteSpace::ELEM_DATA);
    ReaderCache::get_reader(reader_file_ )->find_header(header_query);
    data_ = ReaderCache::get_reader(reader_file_ )->template get_element_data<typename Value::element_type>(
            source_mesh_->n_elements(), this->value_.n_rows() * this->value_.n_cols(), boundary_domain_, this->component_idx_);
    CheckResult checked_data = ReaderCache::get_reader(reader_file_)->scale_and_check_limits(field_name_,
            this->unit_conversion_coefficient_, default_value_);
 
    if (checked_data == CheckResult::not_a_number) {
        THROW( ExcUndefElementValue() << EI_Field(field_name_) );
    }
 
    return true;
}
 
 
 
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.measure();
 
        // gets suspect elements
        if (elm.dim() == 0) {
            searched_elements_.clear();
            ((BIHTree *)bih_tree_)->find_point(elm.node(0)->point(), searched_elements_);
        } else {
            BoundingBox bb = elm.bounding_box();
            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;
 
        START_TIMER("compute_pressure");
        ADD_CALLS(searched_elements_.size());
                
                
        MappingP1<3,3> mapping;
                
        for (std::vector<unsigned int>::iterator it = searched_elements_.begin(); it!=searched_elements_.end(); it++)
        {
            ElementAccessor<3> ele = source_mesh_->element_accessor(*it);
            if (ele->dim() == 3) {
                // get intersection (set measure = 0 if intersection doesn't exist)
                switch (elm.dim()) {
                    case 0: {
                        arma::vec::fixed<3> real_point = elm.node(0)->point();
                        arma::mat::fixed<3, 4> elm_map = mapping.element_map(ele);
                        arma::vec::fixed<4> unit_point = mapping.project_real_to_unit(real_point, elm_map);
 
                        measure = (std::fabs(arma::sum( unit_point )-1) <= 1e-14
                                        && arma::min( unit_point ) >= 0)
                                            ? 1.0 : 0.0;
                        break;
                    }
                    case 1: {
                        IntersectionAux<1,3> is;
                        ComputeIntersection<1,3> CI(elm, ele, source_mesh_.get());
                        CI.init();
                        CI.compute(is);
 
                        IntersectionLocal<1,3> ilc(is);
                        measure = ilc.compute_measure() * elm.measure();
                        break;
                    }
                    case 2: {
                        IntersectionAux<2,3> is;
                        ComputeIntersection<2,3> CI(elm, ele, source_mesh_.get());
                        CI.init();
                        CI.compute(is);
 
                        IntersectionLocal<2,3> ilc(is);
                        measure = 2 * ilc.compute_measure() * elm.measure();
                        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);
}
 
 
 
// Instantiations of FieldInterpolatedP0
INSTANCE_ALL(FieldInterpolatedP0)