78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
//-----------------------------------------------------------------------------------
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// Implementation of a MPS algorithm via PC-tree.
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//-----------------------------------------------------------------------------------
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#include "mps.h"
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#include <ogdf/fileformats/GraphIO.h>
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//-----------------------------------------------------------------------------------
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// Finding MPS
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//-----------------------------------------------------------------------------------
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int find_mps(string input_file) {
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maximal_planar_subgraph_finder m;
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return m.find_mps(input_file);
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}
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int compute_removed_edge_size(string input_file, vector<int> post_order) {
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maximal_planar_subgraph_finder m;
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return m.compute_removed_edge_size(input_file, post_order);
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}
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int maximal_planar_subgraph_finder::find_mps(string input_file) {
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read_from_gml(input_file);
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postOrderTraversal();
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sort_adj_list();
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determine_edges();
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back_edge_traversal();
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return output_removed_edge_size();
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}
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int maximal_planar_subgraph_finder::compute_removed_edge_size(string input_file, vector<int> post_order) {
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read_from_gml(input_file);
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set_post_order(post_order);
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sort_adj_list();
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determine_edges();
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back_edge_traversal();
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return output_removed_edge_size();
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}
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//-----------------------------------------------------------------------------------
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// Imput, output
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//-----------------------------------------------------------------------------------
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// read input file of gml format
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void maximal_planar_subgraph_finder::read_from_gml(string input_file) {
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ogdf::Graph G;
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// utilize OGDF readGML
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if (!ogdf::GraphIO::read(G, input_file, ogdf::GraphIO::readGML)) {
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std::cerr << "Could not read " << input_file << ".gml" << std::endl;
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}
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// create nodes
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for (int i = 0; i < G.numberOfNodes(); ++i) {
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_node_list.push_back(new node(P_NODE));
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_node_list[i]->set_id(i);
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}
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// create edges
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for (ogdf::edge e : G.edges) {
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ogdf::node source = e->source();
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ogdf::node target = e->target();
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_node_list[source->index()]->add_adj(_node_list[target->index()]);
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_node_list[target->index()]->add_adj(_node_list[source->index()]);
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}
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}
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//Output a maximal planar subgraph in the same format as input.
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int maximal_planar_subgraph_finder::output_removed_edge_size() {
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int sum = 0;
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for (int i = 0; i < _back_edge_list.size(); ++i) {
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if (_is_back_edge_eliminate[i]) ++sum;
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}
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return sum;
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} |