77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
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// Copyright (c) 2001
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). 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/Kernel_d/include/CGAL/Kernel_d/DirectionHd_impl.h $
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// $Id: DirectionHd_impl.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-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_DIRECTIONHD_C
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#define CGAL_DIRECTIONHD_C
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namespace CGAL {
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template <class RT, class LA>
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DirectionHd<RT,LA>::DirectionHd(const VectorHd<RT,LA>& v) : Base(v) {}
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template <class RT, class LA>
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VectorHd<RT,LA> DirectionHd<RT,LA>::vector() const
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{ return VectorHd<RT,LA>(*this); }
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template <class RT, class LA>
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DirectionHd<RT,LA> DirectionHd<RT,LA>::
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transform(const Aff_transformationHd<RT,LA>& t) const
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{ return vector().transform(t).direction(); }
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template <class RT, class LA>
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Comparison_result DirectionHd<RT,LA>::
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cmp(const DirectionHd<RT,LA>& h1,
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const DirectionHd<RT,LA>& h2)
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{
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if (h1.identical(h2)) return EQUAL;
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int i, d = h1.dimension();
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for (i = 0; i < d && h1.delta(i)==0 &&
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h2.delta(i)==0; i++) {}
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int c1 = CGAL_NTS sign(h1.delta(i));
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int c2 = CGAL_NTS sign(h2.delta(i));
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if (c1 != c2) return CGAL_NTS compare(c1,c2);
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RT s1 = (RT) (int) CGAL_NTS sign(h2.delta(i)) * h2.delta(i);
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RT s2 = (RT) (int) CGAL_NTS sign(h1.delta(i)) * h1.delta(i);
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i++;
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Comparison_result c;
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while (i < d) {
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c = CGAL_NTS compare(s1 * h1.delta(i), s2 * h2.delta(i));
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if (c != EQUAL) return c;
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i++;
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}
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return EQUAL;
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}
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template <class RT, class LA>
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std::istream& operator>>(std::istream& I, DirectionHd<RT,LA>& dir)
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{ dir.copy_on_write(); dir.ptr()->read(I);
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CGAL_assertion_msg((dir.D()>=0),
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"operator>>: denominator of direction must be nonnegative.");
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return I;
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}
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template <class RT, class LA>
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std::ostream& operator<<(std::ostream& O, const DirectionHd<RT,LA>& dir)
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{ dir.ptr()->print(O,"DirectionHd"); return O; }
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//----------------------- end of file ----------------------------------
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} //namespace CGAL
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#endif // CGAL_DIRECTIONHD_C
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