mirror of https://github.com/CGAL/cgal
387 lines
11 KiB
C++
387 lines
11 KiB
C++
// ======================================================================
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//
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// Copyright (c) 2000 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------
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//
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// release :
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// release_date :
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//
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// file : include/CGAL/Cartesian/Sphere_3.h
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// revision : $Revision$
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// revision_date : $Date$
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// author(s) : Herve Bronnimann
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// coordinator : INRIA Sophia-Antipolis (Mariette.Yvinec@sophia.inria.fr)
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//
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// ======================================================================
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#ifndef CGAL_CARTESIAN_SPHERE_3_H
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#define CGAL_CARTESIAN_SPHERE_3_H
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#include <CGAL/Cartesian/redefine_names_3.h>
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#include <CGAL/Cartesian/Sphere_rep_3.h>
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CGAL_BEGIN_NAMESPACE
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template <class R_>
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class SphereC3 CGAL_ADVANCED_KERNEL_PARTIAL_SPEC
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: public R_::Sphere_handle_3
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{
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public:
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typedef R_ R;
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typedef typename R::FT FT;
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typedef typename R::RT RT;
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typedef typename R::Sphere_handle_3 Sphere_handle_3_;
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typedef typename Sphere_handle_3_::element_type Sphere_ref_3;
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#ifndef CGAL_CFG_NO_ADVANCED_KERNEL
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typedef SphereC3<R CGAL_CTAG> Self;
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typedef typename R::Point_3 Point_3;
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typedef typename R::Vector_3 Vector_3;
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typedef typename R::Aff_transformation_3 Aff_transformation_3;
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#else
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typedef SphereC3<R> Self;
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typedef typename R::Point_3_base Point_3;
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typedef typename R::Vector_3_base Vector_3;
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typedef typename R::Aff_transformation_3_base Aff_transformation_3;
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#endif
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SphereC3()
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: Sphere_handle_3_() {}
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SphereC3(const Point_3 ¢er, const FT &squared_radius,
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const Orientation &o = COUNTERCLOCKWISE)
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{
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CGAL_kernel_precondition( (squared_radius >= FT(0)) &&
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(o != COLLINEAR) );
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initialize_with(Sphere_ref_3(center, squared_radius, o));
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}
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// Sphere passing through and oriented by p,q,r,s
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SphereC3(const Point_3 &p, const Point_3 &q,
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const Point_3 &r, const Point_3 &s)
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{
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Orientation orient = CGAL::orientation(p, q, r, s);
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Point_3 center = circumcenter(p, q, r, s);
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FT squared_radius = squared_distance(p, center);
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initialize_with(Sphere_ref_3(center, squared_radius, orient));
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}
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// Sphere with great circle passing through p,q,r, oriented by o
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SphereC3(const Point_3 &p, const Point_3 &q, const Point_3 &r,
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const Orientation &o = COUNTERCLOCKWISE)
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{
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CGAL_kernel_precondition(o != COLLINEAR);
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Point_3 center = circumcenter(p, q, r);
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FT squared_radius = squared_distance(p, center);
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initialize_with(Sphere_ref_3(center, squared_radius, o));
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}
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// Sphere with diameter pq and orientation o
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SphereC3(const Point_3 &p, const Point_3 &q,
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const Orientation &o = COUNTERCLOCKWISE)
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{
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CGAL_kernel_precondition(o != COLLINEAR);
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Point_3 center = midpoint(p, q);
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FT squared_radius = squared_distance(p, center);
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initialize_with(Sphere_ref_3(center, squared_radius, o));
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}
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SphereC3(const Point_3 ¢er,
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const Orientation& o = COUNTERCLOCKWISE)
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{
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CGAL_kernel_precondition(o != COLLINEAR);
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initialize_with(Sphere_ref_3(center, FT(0), o));
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}
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bool operator==(const Self &) const;
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bool operator!=(const Self &) const;
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const Point_3 & center() const
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{
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return Ptr()->center;
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}
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const FT & squared_radius() const
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{
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// Returns the square of the radius (instead of the radius itself,
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// which would require square roots)
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return Ptr()->squared_radius;
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}
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Orientation orientation() const
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{
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return Ptr()->orient;
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}
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Self orthogonal_transform(const Aff_transformation_3 &t) const
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{
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// FIXME: precond: t.is_orthogonal() (*UNDEFINED*)
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Vector_3 vec(FT(1), FT(0)); // unit vector
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vec = vec.transform(t); // transformed
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FT sq_scale = vec.squared_length(); // squared scaling factor
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return SphereC3(t.transform(center()),
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sq_scale * squared_radius(),
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t.is_even() ? orientation()
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: CGAL::opposite(orientation()));
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}
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// A circle is degenerate if its (squared) radius is null or negative
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bool is_degenerate() const;
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// Returns a circle with opposite orientation
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Self opposite() const;
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Oriented_side oriented_side(const Point_3 &p) const;
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//! precond: ! x.is_degenerate() (when available)
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// Returns R::ON_POSITIVE_SIDE, R::ON_ORIENTED_BOUNDARY or
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// R::ON_NEGATIVE_SIDE
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bool has_on_boundary(const Point_3 &p) const;
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bool has_on_positive_side(const Point_3 &p) const;
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bool has_on_negative_side(const Point_3 &p) const;
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Bounded_side bounded_side(const Point_3 &p) const;
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//! precond: ! x.is_degenerate() (when available)
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// Returns R::ON_BOUNDED_SIDE, R::ON_BOUNDARY or R::ON_UNBOUNDED_SIDE
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bool has_on_bounded_side(const Point_3 &p) const;
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bool has_on_unbounded_side(const Point_3 &p) const;
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Bbox_3 bbox() const;
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};
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#ifdef CGAL_CFG_TYPENAME_BUG
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#define typename
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#endif
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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SphereC3<R CGAL_CTAG>::operator==(const SphereC3<R CGAL_CTAG> &t) const
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{
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if (identical(t))
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return true;
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return center() == t.center() &&
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squared_radius() == t.squared_radius() &&
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orientation() == t.orientation();
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}
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template < class R >
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inline
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bool
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SphereC3<R CGAL_CTAG>::operator!=(const SphereC3<R CGAL_CTAG> &t) const
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{
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return !(*this == t);
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}
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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Oriented_side
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SphereC3<R CGAL_CTAG>::
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oriented_side(const typename SphereC3<R CGAL_CTAG>::Point_3 &p) const
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{
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return Oriented_side(bounded_side(p) * orientation());
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}
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template < class R >
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CGAL_KERNEL_INLINE
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Bounded_side
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SphereC3<R CGAL_CTAG>::
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bounded_side(const typename SphereC3<R CGAL_CTAG>::Point_3 &p) const
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{
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// FIXME: it's a predicate...
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return Bounded_side(CGAL_NTS compare(squared_radius(),
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squared_distance(center(),p)));
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}
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template < class R >
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inline
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bool
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SphereC3<R CGAL_CTAG>::
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has_on_boundary(const typename SphereC3<R CGAL_CTAG>::Point_3 &p) const
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{
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// FIXME: it's a predicate...
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return squared_distance(center(),p) == squared_radius();
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// NB: J'ai aussi trouve ailleurs :
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// return oriented_side(p)==ON_ORIENTED_BOUNDARY;
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// a voir...
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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SphereC3<R CGAL_CTAG>::
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has_on_negative_side(const typename SphereC3<R CGAL_CTAG>::Point_3 &p) const
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{
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if (orientation() == COUNTERCLOCKWISE)
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return has_on_unbounded_side(p);
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return has_on_bounded_side(p);
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// NB: J'ai aussi trouve ailleurs :
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// return oriented_side(p)==ON_NEGATIVE_SIDE;
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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SphereC3<R CGAL_CTAG>::
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has_on_positive_side(const typename SphereC3<R CGAL_CTAG>::Point_3 &p) const
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{
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if (orientation() == COUNTERCLOCKWISE)
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return has_on_bounded_side(p);
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return has_on_unbounded_side(p);
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// NB: J'ai aussi trouve ailleurs :
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// return oriented_side(p)==ON_POSITIVE_SIDE;
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}
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template < class R >
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inline
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bool
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SphereC3<R CGAL_CTAG>::
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has_on_bounded_side(const typename SphereC3<R CGAL_CTAG>::Point_3 &p) const
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{
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// FIXME: it's a predicate...
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return squared_distance(center(),p) < squared_radius();
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// NB: J'ai aussi trouve ailleurs :
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// return bounded_side(p)==ON_BOUNDED_SIDE;
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}
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template < class R >
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inline
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bool
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SphereC3<R CGAL_CTAG>::
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has_on_unbounded_side(const typename SphereC3<R CGAL_CTAG>::Point_3 &p) const
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{
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// FIXME: it's a predicate...
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return squared_distance(center(),p) > squared_radius();
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// NB: J'ai aussi trouve ailleurs :
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// return bounded_side(p)==ON_UNBOUNDED_SIDE;
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}
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template < class R >
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inline
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bool
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SphereC3<R CGAL_CTAG>::
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is_degenerate() const
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{
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// FIXME: it's a predicate (?)
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return CGAL_NTS is_zero(squared_radius());
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}
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template < class R >
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inline
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SphereC3<R CGAL_CTAG> SphereC3<R CGAL_CTAG>::
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opposite() const
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{
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return SphereC3<R CGAL_CTAG>(center(), squared_radius(),
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CGAL::opposite(orientation()) );
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}
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template < class R >
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CGAL_KERNEL_INLINE
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Bbox_3
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SphereC3<R CGAL_CTAG>::bbox() const
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{
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double cx = CGAL::to_double(center().x());
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double cy = CGAL::to_double(center().y());
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double cz = CGAL::to_double(center().z());
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double radius = CGAL::sqrt(CGAL::to_double(squared_radius()));
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return Bbox_3(cx - radius, cy - radius, cz - radius,
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cx + radius, cy + radius, cz + radius);
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}
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/*
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template < class R >
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inline
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EllipseC3<SphereC3<R CGAL_CTAG>::FT> SphereC3<R CGAL_CTAG>::i
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transform(const Aff_transformationC3<SphereC3<R CGAL_CTAG>::FT> &t) const
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{
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return SphereC3<R CGAL_CTAG>(t.transform(center()),
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squared_radius(),
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orientation());
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}
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*/
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#ifndef CGAL_NO_OSTREAM_INSERT_SPHEREC3
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template < class R >
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CGAL_KERNEL_INLINE
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std::ostream &
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operator<<(std::ostream &os, const SphereC3<R CGAL_CTAG> &c)
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{
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switch(os.iword(IO::mode)) {
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case IO::ASCII :
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os << c.center() << ' ' << c.squared_radius() << ' '
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<< static_cast<int>(c.orientation());
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break;
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case IO::BINARY :
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os << c.center();
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write(os, c.squared_radius());
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write(os, static_cast<int>(c.orientation()));
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break;
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default:
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os << "SphereC3(" << c.center() << ", " << c.squared_radius();
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switch (c.orientation()) {
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case CLOCKWISE:
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os << ", clockwise)";
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break;
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case COUNTERCLOCKWISE:
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os << ", counterclockwise)";
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break;
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default:
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os << ", collinear)";
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break;
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}
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break;
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}
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return os;
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}
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#endif // CGAL_NO_OSTREAM_INSERT_SPHEREC3
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#ifndef CGAL_NO_ISTREAM_EXTRACT_SPHEREC3
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template < class R >
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CGAL_KERNEL_INLINE
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std::istream &
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operator>>(std::istream &is, SphereC3<R CGAL_CTAG> &c)
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{
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typename SphereC3<R CGAL_CTAG>::Point_3 center;
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typename R::FT squared_radius;
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int o;
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switch(is.iword(IO::mode)) {
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case IO::ASCII :
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is >> center >> squared_radius >> o;
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break;
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case IO::BINARY :
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is >> center;
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read(is, squared_radius);
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is >> o;
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break;
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default:
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std::cerr << "" << std::endl;
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std::cerr << "Stream must be in ascii or binary mode" << std::endl;
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break;
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}
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if (is)
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c = SphereC3<R CGAL_CTAG>(center, squared_radius,
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static_cast<Orientation>(o));
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return is;
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}
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#endif // CGAL_NO_ISTREAM_EXTRACT_SPHEREC3
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#ifdef CGAL_CFG_TYPENAME_BUG
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#undef typename
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#endif
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CGAL_END_NAMESPACE
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#endif // CGAL_CARTESIAN_SPHERE_3_H
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