248 lines
9.6 KiB
C
248 lines
9.6 KiB
C
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// Copyright (c) 2000,2001
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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); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 3 of the License,
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// or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0+
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//
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//
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// Author(s) : Michael Seel
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#ifndef CGAL_PREDICATES_D_H
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#define CGAL_PREDICATES_D_H
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#include <CGAL/basic.h>
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#include <CGAL/enum.h>
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#include <CGAL/Kernel_d/Point_d.h>
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namespace CGAL {
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/*{\Moptions outfile=predicates_d.man}*/
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/*{\Mtext \setopdims{4cm}{2cm}\computewidths
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\headerline{Linear and affine predicates}
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For an iterator range |[first,last)| we define |T = tuple [first,last)|
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as the ordered tuple $(|T[0]|,|T[1]|, \ldots |T[d-1]|)$ where
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$|T[i]| = |*| |++|^{(i)}|first|$ (the element obtained by $i$ times
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forwarding the iterator by operator |++| and then dereferencing it to
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get the value to which it points). We write |d = size [first,last)|.
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This extends the syntax of random access iterators to input iterators.
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If we index the tuple as above then we require that
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$|++|^{(d+1)}|first == last|$.
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In the following we require the Iterators to be globally
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of value type |Point_d<R>|. Also if we are handed over an iterator
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range |[first,last)|, then all points in |T = tuple [first,last)|
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have the same dimension |dim|.
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}*/
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template <class R, class ForwardIterator, class OutputIterator>
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OutputIterator barycentric_coordinates(
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ForwardIterator first, ForwardIterator last, const Point_d<R>& p,
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OutputIterator result)
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/*{\Xfunc returns the barycentric coordinates of a point $p \in R^d$ in a
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affine space of dimension $k$ spanned by the points in |tuple [first,last)|.
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\precond value type of |ForwardIterator| is |Point_d<R>|,
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|affinely_independed(first,last)| and
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|affine_rank(tuple [first,last),p)==k|.}*/
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{ typename R::Barycentric_coordinates_d coords;
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return coords(first,last,p,result);
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}
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template <class ForwardIterator>
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Orientation
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orientation(ForwardIterator first, ForwardIterator last)
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/*{\Mfunc determines the orientation of the points in the tuple
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|A = tuple [first,last)| where $A$ consists of $d + 1$ points in $d$ - space.
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This is the sign of the determinant
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\[ \left\Lvert \begin{array}{cccc}
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1 & 1 & 1 & 1 \\
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A[0] & A[1] & \dots & A[d]
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\end{array} \right\Lvert \]
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where |A[i]| denotes the cartesian coordinate vector of
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the $i$-th point in $A$.
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\precond |size [first,last) == d+1| and |A[i].dimension() == d|
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$\forall 0 \leq i \leq d$
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and the value type of |ForwardIterator| is |Point_d<R>|.}*/
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{ typedef typename std::iterator_traits<ForwardIterator>::value_type PointD;
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typedef typename PointD::R R;
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typename R::Orientation_d or_; return or_(first,last); }
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template <class ForwardIterator>
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Orientation
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coaffine_orientation(ForwardIterator first, ForwardIterator last)
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/*{\Mfunc determines the orientation of the points in the tuple
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|A = tuple [first,last)| where $A$ consists of $k + 1$ points in $d$ - space.
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This is the sign of the determinant
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\[ \left\Lvert \begin{array}{cccc}
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1 & 1 & 1 & 1 \\
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A[0] & A[1] & \dots & A[k]
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\end{array} \right\Lvert \]
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where |A[a_i]| denotes the cartesian coordinate vector of
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the $i$-th point in $A$, after projection on an axis-aligned |k|-affine subspace.
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\precond |size [first,last) <= d| and |A[i].dimension() == d|
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$\forall 0 \leq i \leq d$
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and the value type of |ForwardIterator| is |Point_d<R>|.}*/
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{
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typedef typename std::iterator_traits<ForwardIterator>::value_type PointD;
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typedef typename PointD::R R;
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typename R::Coaffine_orientation_d or_;
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return or_(first,last);
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}
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template <class R, class ForwardIterator>
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Oriented_side side_of_oriented_sphere(
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ForwardIterator first, ForwardIterator last,
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const Point_d<R>& x)
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/*{\Mfuncl determines to which side of the sphere $S$ defined by the
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points in |A = tuple [first,last)| the point $x$ belongs,
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where $A$ consists of $d + 1$ points in $d$ - space.
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The positive side is determined by the positive sign
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of the determinant \[
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\left\Lvert \begin{array}{ccccc}
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1 & 1 & 1 & 1 & 1\\
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|lift(A[0])| & |lift(A[1])| & \dots & |lift(A[d])| & |lift(x)|
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\end{array} \right\Lvert \]
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where for a point $p$ with cartesian coordinates $p_i$ we use
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|lift(p)| to denote the $d + 1$-dimensional point with cartesian
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coordinate vector $(p_0, \ldots,p_{d-1},\sum_{0 \le i < d}p_i^2)$. If
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the points in $A$ are positively oriented then the positive
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side is the inside of the sphere and the negative side is
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the outside of the sphere.
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\precond value type of |ForwardIterator| is |Point_d<R>|.}*/
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{ typename R::Side_of_oriented_sphere_d side;
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return side(first,last,x); }
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template <class R, class ForwardIterator>
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Bounded_side side_of_bounded_sphere(
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ForwardIterator first, ForwardIterator last,
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const Point_d<R> &p)
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/*{\Mfunc determines whether the point |p| lies |ON_BOUNDED_SIDE|,
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|ON_BOUNDARY|, or |ON_UNBOUNDED_SIDE| of the sphere defined by
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the points in |A = tuple [first,last)| where $A$ consists of $d+1$
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points in $d$-space.
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\precond value type of |ForwardIterator| is |Point_d<R>| and
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$|orientation(first,last)| \neq |ZERO|$.}*/
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{ typename R::Side_of_bounded_sphere_d side;
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return side(first,last,p); }
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template <class R, class ForwardIterator>
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bool contained_in_simplex(
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ForwardIterator first, ForwardIterator last, const Point_d<R>& p)
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/*{\Mfunc determines whether |p| is contained in the simplex spanned
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by the points in |A = tuple [first,last)|. |A| may consists of up to
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$d + 1$ points.
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\precond value type of |ForwardIterator| is |Point_d<R>| and
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the points in |A| are affinely independent.}*/
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{ typename R::Contained_in_simplex_d contained;
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return contained(first,last,p); }
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template <class R, class ForwardIterator>
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bool contained_in_affine_hull(
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ForwardIterator first, ForwardIterator last,
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const Point_d<R>& p)
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/*{\Mfunc determines whether $p$ is contained in the affine hull
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of the points in |A = tuple [first,last)|.
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\precond value type of |ForwardIterator| is |Point_d<R>|.}*/
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{ typename R::Contained_in_affine_hull_d contained;
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return contained(first,last,p); }
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template <class ForwardIterator>
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int affine_rank(ForwardIterator first, ForwardIterator last)
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/*{\Mfunc computes the affine rank of the points in |A = tuple [first,last)|.
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\precond value type of |ForwardIterator| is |Point_d<R>|.}*/
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{ typedef typename std::iterator_traits<ForwardIterator>::value_type PointD;
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typedef typename PointD::R R;
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typename R::Affine_rank_d rank;
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return rank(first,last); }
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template <class ForwardIterator>
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bool affinely_independent(ForwardIterator first, ForwardIterator last)
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/*{\Mfunc decides whether the points in |A = tuple [first,last)| are
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affinely independent.
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\precond value type of |ForwardIterator| is |Point_d<R>|.}*/
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{ typedef typename std::iterator_traits<ForwardIterator>::value_type PointD;
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typedef typename PointD::R R;
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typename R::Affinely_independent_d ind;
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return ind(first,last); }
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template <class R>
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Comparison_result compare_lexicographically(
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const Point_d<R>& p1, const Point_d<R>& p2)
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/*{\Mfunc compares the Cartesian coordiantes of points |p1| and |p2|
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lexicographically.}*/
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{ typename R::Compare_lexicographically_d cmp;
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return cmp(p1,p2); }
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template <class R>
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bool lexicographically_smaller(
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const Point_d<R>& p1, const Point_d<R>& p2)
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/*{\Mfunc returns true iff $|p1| < |p2|$ in the Cartesian lexicographic
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order of points.}*/
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{ typename R::Less_lexicographically_d lt;
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return lt(p1,p2); }
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template <class R>
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bool lexicographically_smaller_or_equal(
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const Point_d<R>& p1, const Point_d<R>& p2)
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/*{\Mfunc returns true iff $|p1| \leq |p2|$ in the Cartesian lexicographic
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order of points.}*/
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{ typename R::Less_or_equal_lexicographically_d le;
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return le(p1,p2); }
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template <class R, class ForwardIterator>
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bool contained_in_linear_hull(
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ForwardIterator first, ForwardIterator last, const Vector_d<R>& x)
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/*{\Mfunc determines whether $x$ is contained in the linear hull
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of the vectors in |A = tuple [first,last)|.
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\precond value type of |ForwardIterator| is |Vector_d<R>|.}*/
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{ typename R::Contained_in_linear_hull_d contained;
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return contained(first,last,x); }
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template <class ForwardIterator>
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int linear_rank(
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ForwardIterator first, ForwardIterator last)
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/*{\Mfunc computes the linear rank of the vectors in
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|A = tuple [first,last)|.
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\precond value type of |ForwardIterator| is |Vector_d<R>|.}*/
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{ typedef typename std::iterator_traits<ForwardIterator>::
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value_type value_type;
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typedef typename value_type::R R;
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typename R::Linear_rank_d rank;
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return rank(first,last);
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}
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template <class ForwardIterator>
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bool linearly_independent(
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ForwardIterator first, ForwardIterator last)
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/*{\Mfunc decides whether the vectors in $A$ are linearly independent.
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\precond value type of |ForwardIterator| is |Vector_d<R>|.}*/
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{ TUPLE_DIM_CHECK(first,last,linearly_independent);
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typedef typename std::iterator_traits<ForwardIterator>::
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value_type value_type;
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typedef typename value_type::R R;
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typename R::Linearly_independent_d independent;
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return independent(first,last);
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}
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} //namespace CGAL
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#endif // CGAL_PREDICATES_D_H
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