mirror of https://github.com/CGAL/cgal
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
// file: examples/Arrangement_2/example8.C
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#include "short_names.h"
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#include <CGAL/Homogeneous.h>
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#include <CGAL/MP_Float.h>
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#include <CGAL/Arr_2_default_dcel.h>
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#include <CGAL/Arrangement_2.h>
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#include <CGAL/Arr_segment_traits_2.h>
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typedef CGAL::MP_Float NT;
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typedef CGAL::Homogeneous<NT> Kernel;
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typedef CGAL::Arr_segment_traits_2<Kernel> Traits;
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typedef Traits::Point_2 Point;
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typedef Traits::Curve_2 Curve;
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typedef Traits::X_monotone_curve_2 X_curve;
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typedef CGAL::Arr_2_default_dcel<Traits> Dcel;
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typedef CGAL::Arrangement_2<Dcel,Traits> Arr_2;
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int main()
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{
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Arr_2 arr;
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// Read the segments
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int num_curves;
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int x,y;
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std::cout << "Enter number of segments: " ;
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std::cin >> num_curves;
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while (num_curves--)
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{
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std::cout << "Enter source coordinates (2 integers): " ;
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std::cin >> x >> y;
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Point s(x, y);
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std::cout << "Enter target coordinates (2 integers): " ;
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std::cin >> x >> y;
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Point t(x, y);
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X_curve seg(s, t);
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arr.insert(seg);
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}
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// Do the ray shooting
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std::cout << "Enter point for ray shooting (2 integers): " ;
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std::cin >> x >> y;
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Point p(x, y);
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Arr_2::Halfedge_handle e = arr.halfedges_begin();
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Arr_2::Locate_type lt;
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e = arr.vertical_ray_shoot(p, lt, true);
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// Check the location type
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if (lt == Arr_2::UNBOUNDED_FACE)
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{
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std::cout << "UNBOUNDED_FACE" << std::endl;
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}
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else
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{
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std::cout << "The half-edge shot is :" << std::endl;
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std::cout << "(Using homogeneous coordinates <hx, hy, hw> ";
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std::cout << "where <x, y>=<hx/hw, hy/hw>)" << std::endl;
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std::cout << e->source()->point() << " -> " << e->target()->point();
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std::cout << std::endl;
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}
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return 0;
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}
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