115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
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// Copyright (c) 1997-2002 Max-Planck-Institute Saarbruecken (Germany).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Nef_S2/include/CGAL/Nef_S2/Sphere_triangle.h $
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// $Id: Sphere_triangle.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Michael Seel <seel@mpi-sb.mpg.de>
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#ifndef CGAL_SPHERE_TRIANGLE_H
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#define CGAL_SPHERE_TRIANGLE_H
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#include <CGAL/license/Nef_S2.h>
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#include <CGAL/basic.h>
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#include <CGAL/Handle_for.h>
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#include <CGAL/array.h>
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namespace CGAL {
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template <class R_> class Sphere_triangle_rep
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{ typedef Sphere_point<R_> Point;
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typedef Sphere_circle<R_> Circle;
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typedef Sphere_triangle_rep<R_> Rep;
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std::array<Point,3> points_;
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std::array<Circle,3> circles_;
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friend class Sphere_triangle<R_>;
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Sphere_triangle_rep(const Point& p1, const Point& p2, const Point& p3,
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const Circle& c1, const Circle& c2, const Circle& c3) :
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points_(CGAL::make_array(p1,p2,p3)), circles_(CGAL::make_array(c1,c2,c3)) {}
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public:
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Sphere_triangle_rep() {}
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};
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/*{\Manpage{Sphere_triangle}{R}{Triangles on the unit sphere}{t}}*/
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template <class R_> class Sphere_triangle :
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public Handle_for< Sphere_triangle_rep<R_> > {
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/*{\Mdefinition An object |\Mvar| of type |\Mname| is a triangle
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on the surface of the unit sphere.}*/
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public:
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/*{\Mtypes 5}*/
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typedef R_ R;
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/*{\Mtypemember representation class.}*/
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typedef typename R::RT RT;
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/*{\Mtypemember ring type.}*/
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typedef Sphere_triangle_rep<R_> Rep;
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typedef Handle_for<Rep> Base;
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/*{\Mcreation 5}*/
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Sphere_triangle() : Base() {}
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/*{\Mcreate creates some triangle.}*/
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Sphere_triangle(
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const Sphere_point<R>& p0, const Sphere_point<R>& p1,
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const Sphere_point<R>& p2,
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const Sphere_circle<R>& c0, const Sphere_circle<R>& c1,
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const Sphere_circle<R>& c2) : Base(Rep(p0,p1,p2,c0,c1,c2))
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/*{\Mcreate creates a triangle spanned by the three points
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|p0|, |p1|, |p2|, where the triangle is left of the three circles
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|c0|, |c1|, |c2|. \precond $c_i$ contains $p_i$ and $p_{i+1}$ mod 3.}*/
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{ CGAL_assertion( c0.has_on(p0) && c0.has_on(p1) );
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CGAL_assertion( c1.has_on(p1) && c1.has_on(p2) );
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CGAL_assertion( c2.has_on(p2) && c0.has_on(p0) );
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}
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Sphere_triangle(const Sphere_triangle<R>& t) : Base(t) {}
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/*{\Moperations 4 2}*/
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const Sphere_point<R>& point(unsigned i) const
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/*{\Mop returns the ith point of |\Mvar|.}*/
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{ return this->ptr()->points_[i%3]; }
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const Sphere_circle<R>& circle(unsigned i) const
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/*{\Mop returns the ith circle of |\Mvar|.}*/
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{ return this->ptr()->circles_[i%3]; }
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Sphere_triangle<R> opposite() const
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/*{\Mop returns the opposite of |\Mvar|.}*/
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{ return Sphere_triangle<R>(point(0), point(1), point(2),
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circle(0).opposite(), circle(1).opposite(), circle(2).opposite()); }
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}; // Sphere_triangle<R>
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template <typename R>
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std::ostream& operator<<(std::ostream& os,
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const CGAL::Sphere_triangle<R>& t)
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{ for (int i=0; i<3; ++i) os << t.point(i);
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for (int i=0; i<3; ++i) os << t.circle(i);
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return os; }
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template <typename R>
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std::istream& operator>>(std::istream& is,
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CGAL::Sphere_triangle<R>& t)
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{ CGAL::Sphere_point<R> p1,p2,p3;
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CGAL::Sphere_circle<R> c1,c2,c3;
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if ( !(is >> p1 >> p2 >> p3 >> c1 >> c2 >> c3) ) return is;
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t = CGAL::Sphere_triangle<R>(p1,p2,p3,c1,c2,c3);
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return is; }
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} //namespace CGAL
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#endif //CGAL_SPHERE_TRIANGLE_H
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