72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
#include <opm/core/grid.h>
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#include <vector>
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#include <map>
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#include <algorithm>
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namespace Opm {
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/// Helper struct for extractColumn
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/// Compares the underlying k-index
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struct ExtractColumnCompare
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{
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ExtractColumnCompare(const UnstructuredGrid& g)
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: grid(g)
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{
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// empty
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}
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bool operator()(const int i, const int j)
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{
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// Extract k-index
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int index_i = grid.global_cell ? grid.global_cell[i] : i;
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int k_i = index_i / grid.cartdims[0] / grid.cartdims[1];
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int index_j = grid.global_cell ? grid.global_cell[j] : j;
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int k_j = index_j / grid.cartdims[0] / grid.cartdims[1];
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return k_i < k_j;
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}
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const UnstructuredGrid& grid;
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};
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/// Extract each column of the grid.
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/// \note Assumes the pillars of the grid are all vertically aligned.
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/// \param grid The grid from which to extract the columns.
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/// \param columns will for each (i, j) where (i, j) represents a non-empty column,
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//// contain the cell indices contained in the column
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/// centered at (i, j) in the second variable, and i+jN in the first variable.
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inline void extractColumn( const UnstructuredGrid& grid, std::pair<std::vector<int>, std::vector<std::vector<int> > >& columns )
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{
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const int* dims = grid.cartdims;
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// Keeps track of column_index ---> index of vector
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std::map<int, int> global_to_local;
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for (int i = 0; i < grid.number_of_cells; ++i) {
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// Extract Cartesian coordinates
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int index = grid.global_cell ? grid.global_cell[i] : i; // If null, assume mapping is identity.
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int i_cart = index % dims[0];
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int k_cart = index / dims[0] / dims[1];
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int j_cart = (index - k_cart*dims[0]*dims[1])/ dims[0];
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int local_index;
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std::map<int, int>::iterator local_index_iterator = global_to_local.find(i_cart+j_cart*dims[0]);
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if( local_index_iterator != global_to_local.end() ) {
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local_index = local_index_iterator->second;
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} else {
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local_index = columns.second.size();
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global_to_local[i_cart+j_cart*dims[0]] = local_index;
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columns.second.push_back(std::vector<int>());
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}
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columns.first.push_back(i_cart + j_cart*dims[0]);
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columns.second[local_index].push_back(i);
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}
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int num_cols = columns.second.size();
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for(int i = 0; i < num_cols; ++i) {
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std::sort(columns.second[i].begin(), columns.second[i].end(), ExtractColumnCompare(grid));
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}
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}
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} // namespace Opm
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