CryptProjectionStatistics.cpp

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*/
#include "CryptProjectionStatistics.hpp"
#include "RandomNumberGenerator.hpp"

bool CellsRadiusComparison(const std::pair<CellPtr, double> lhs, const std::pair<CellPtr, double> rhs)
{
    return lhs.second < rhs.second;
}

CryptProjectionStatistics::CryptProjectionStatistics(MeshBasedCellPopulation<2>& rCrypt)
    : AbstractCryptStatistics(rCrypt)
{
}

bool CryptProjectionStatistics::CellIsInSection(double angle, const c_vector<double,2>& rCellPosition, double widthOfSection)
{
    // Get corresponding 3D position of closest point on line
    c_vector<double,2> line_position;
    line_position[0] = norm_2(rCellPosition)*cos(angle);
    line_position[1] = norm_2(rCellPosition)*sin(angle);

    double distance_between_cell_and_line = norm_2(rCellPosition - line_position);

    return (distance_between_cell_and_line <= widthOfSection);
}

std::vector<CellPtr> CryptProjectionStatistics::GetCryptSection(double angle)
{
    if (angle == DBL_MAX)
    {
        angle = M_PI - 2*M_PI*RandomNumberGenerator::Instance()->ranf();
    }

    assert(angle>=-M_PI && angle<=M_PI);

    std::list<std::pair<CellPtr, double> > cells_list; // the second entry is the radius (needed for sorting)

    // Loop over cells and add to the store if they are within a cell's radius of the
    // specified line
    for (AbstractCellPopulation<2>::Iterator cell_iter = mrCrypt.Begin();
         cell_iter != mrCrypt.End();
         ++cell_iter)
    {
        if (CellIsInSection(angle, mrCrypt.GetLocationOfCellCentre(*cell_iter)))
        {
            // Set up a pair, equal to (cell,r) and insert
            std::pair<CellPtr, double> pair(*cell_iter, norm_2(mrCrypt.GetLocationOfCellCentre(*cell_iter)));
            cells_list.push_back(pair);
        }
    }

    // Sort the list
    cells_list.sort(CellsRadiusComparison);

    // Copy to a vector
    std::vector<CellPtr> ordered_cells;
    for (std::list<std::pair<CellPtr, double> >::iterator iter = cells_list.begin();
         iter != cells_list.end();
         ++iter)
    {
        ordered_cells.push_back(iter->first);
    }

    return ordered_cells;
}