mirror of https://github.com/CGAL/cgal
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
//! \file examples/Minkowski_sum_2/exact_offset.cpp
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// Computing the exact offset of a polygon.
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#include <iostream>
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#include <CGAL/config.h>
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#ifndef CGAL_USE_CORE
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int main()
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{
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std::cout << "Sorry, this example needs CORE ..." << std::endl;
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return 0;
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}
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#else
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#include <fstream>
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#include <boost/timer.hpp>
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#include <CGAL/Gps_traits_2.h>
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#include <CGAL/offset_polygon_2.h>
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#include "arr_conics.h"
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typedef CGAL::Polygon_2<Rat_kernel> Polygon_2;
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typedef CGAL::Gps_traits_2<Traits> Gps_traits;
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typedef Gps_traits::Polygon_with_holes_2 Offset_polygon_with_holes_2;
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int main(int argc, char* argv[])
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{
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// Open the input file and read the input polygon.
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const char* filename = (argc > 1) ? argv[1] : "spiked.dat";
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std::ifstream in_file(filename);
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if (! in_file.is_open()) {
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std::cerr << "Failed to open the input file." << std::endl;
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return -1;
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}
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Polygon_2 P;
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in_file >> P;
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in_file.close();
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std::cout << "Read an input polygon with " << P.size() << " vertices."
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<< std::endl;
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// Compute the offset polygon.
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Traits traits;
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boost::timer timer;
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Offset_polygon_with_holes_2 offset = CGAL::offset_polygon_2(P, 5, traits);
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double secs = timer.elapsed();
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std::cout << "The offset polygon has " << offset.outer_boundary().size()
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<< " vertices, " << offset.number_of_holes() << " holes."
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<< std::endl;
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std::cout << "Offset computation took " << secs << " seconds." << std::endl;
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return 0;
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}
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#endif
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