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https://codeberg.org/vcbferreira/NuFI_deal.ii
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89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
#ifndef CELLS_H
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#define CELLS_H
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#include <algorithm>
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#include <deal.II/base/geometry_info.h>
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#include <deal.II/base/point.h>
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#include <deal.II/dofs/dof_handler.h>
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#include <deal.II/grid/tria.h>
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#include <vector>
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using namespace dealii;
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template <int dim> struct CellInfo {
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// what needs to be given to evaluator
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typename DoFHandler<dim>::active_cell_iterator cell;
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// usefull for locator
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Point<dim> lower;
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Point<dim> upper;
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double h;
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};
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template <int dim> class CellLocator {
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public:
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using CellIterator = typename DoFHandler<dim>::active_cell_iterator;
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void rebuild(const DoFHandler<dim> &dof_handler,
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const Triangulation<dim> &triangulation);
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CellIterator locate(const Point<dim> &p) const;
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private:
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std::vector<CellInfo<dim>> cells;
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};
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template <int dim>
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void CellLocator<dim>::rebuild(const DoFHandler<dim> &dof_handler,
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const Triangulation<dim> &triangulation) {
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cells.clear();
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cells.reserve(triangulation.n_active_cells());
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for (const auto &cell : dof_handler.active_cell_iterators()) {
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CellInfo<dim> info;
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info.cell = cell;
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info.lower = cell->vertex(0);
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info.upper = cell->vertex(GeometryInfo<dim>::vertices_per_cell - 1);
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info.h = info.upper[0] - info.lower[0];
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cells.push_back(info);
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}
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std::sort(cells.begin(), cells.end(),
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[](const CellInfo<dim> &a, const CellInfo<dim> &b) {
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return a.lower[0] < b.lower[0];
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});
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}
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template <int dim>
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typename DoFHandler<dim>::active_cell_iterator
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CellLocator<dim>::locate(const Point<dim> &p) const {
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static_assert(dim == 1,
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"Current CellLocator implementation only supports 1D.");
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AssertThrow(!cells.empty(),
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ExcMessage("CellLocator::rebuild() has not been called."));
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const double x = p[0];
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auto it = std::upper_bound(cells.begin(), cells.end(), x,
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[](double value, const CellInfo<dim> &cell) {
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return value < cell.lower[0];
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}); // returns cell to the right of cell with x
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if (it == cells.begin())
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it = cells.begin();
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else
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--it;
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// Safety check: make sure the point is really inside this cell
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AssertThrow(x >= it->lower[0] - 1e-12 && x <= it->upper[0] + 1e-12,
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ExcMessage("CellLocator failed to find containing cell."));
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return it->cell;
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}
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#endif // !CELLS_H
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