mirror of https://github.com/CGAL/cgal
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* 2D Triangle Ray intersection.
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*/
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#include "numrep1.h"
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#include <iostream>
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#include <CGAL/Object.h>
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#include <CGAL/Triangle_2.h>
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#include <CGAL/Ray_2_Triangle_2_intersection.h>
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#include "numrep2.h"
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typedef CGAL::Point_2< TestR > point_t;
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typedef CGAL::Ray_2< TestR > ray_t;
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typedef CGAL::Segment_2< TestR > segment_t;
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typedef CGAL::Triangle_2< TestR > trian_t;
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void print(const point_t &pt)
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{
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double xd = CGAL::to_double(pt.x());
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double yd = CGAL::to_double(pt.y());
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// force 0 to be positive zero.
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if (xd == 0.0)
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xd = 0.0;
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if (yd == 0.0)
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yd = 0.0;
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std::cout.setf(std::ios::showpos, std::ios::showpos);
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std::cout << xd <<' '<< yd;
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std::cout.unsetf(std::ios::showpos);
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}
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void one_pair(ray_t const & ray, trian_t const & trian)
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{
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segment_t seg;
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point_t point;
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if (CGAL::do_intersect(ray, trian))
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;
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CGAL::Object result = CGAL::intersection(ray, trian);
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if (CGAL::assign(point, result)) {
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std::cout << "Point intersection.\n";
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}
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if (CGAL::assign(seg, result)) {
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std::cout << "Segment intersection.\n";
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}
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if (!CGAL::assign(seg, result) && !CGAL::assign(point, result)) {
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std::cout << "No intersection.\n";
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}
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}
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int main()
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{
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randomint ri;
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int x1, x2, x3, y1, y2, y3, w1, w2, w3;
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std::cin >> x1 >> y1 >> x2 >> y2;
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if (!std::cin)
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return 1;
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w1 = ri.next();
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w2 = ri.next();
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point_t tp1(to_nt(w1*x1), to_nt(w1*y1), to_nt(w1));
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point_t tp2(to_nt(w2*x2), to_nt(w2*y2), to_nt(w2));
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ray_t ray(tp1, tp2);
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std::cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
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if (!std::cin)
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return 1;
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w1 = ri.next();
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w2 = ri.next();
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w3 = ri.next();
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point_t tp3(to_nt(w1*x1), to_nt(w1*y1), to_nt(w1));
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point_t tp4(to_nt(w2*x2), to_nt(w2*y2), to_nt(w2));
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point_t tp5(to_nt(w3*x3), to_nt(w3*y3), to_nt(w3));
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trian_t trian(tp3, tp4, tp5);
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one_pair(ray, trian);
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return 0;
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}
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