1 // Copyright (C) 2006 Mathias Froehlich - Mathias.Froehlich@web.de
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Library General Public
5 // License as published by the Free Software Foundation; either
6 // version 2 of the License, or (at your option) any later version.
8 // This library is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // Library General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program; if not, write to the Free Software
15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
27 SGSphere(const SGVec3<T>& center, const T& radius) :
32 const SGVec3<T>& getCenter() const
34 void setCenter(const SGVec3<T>& center)
37 const T& getRadius() const
39 void setRadius(const T& radius)
42 { return _radius*_radius; }
44 const bool empty() const
48 { return 0 <= _radius; }
53 void expandBy(const SGVec3<T>& v)
61 T dist2 = distSqr(_center, v);
62 if (dist2 <= getRadius2())
66 T newRadius = T(0.5)*(_radius + dist);
67 _center += ((newRadius - _radius)/dist)*(v - _center);
76 /// Output to an ostream
77 template<typename char_type, typename traits_type, typename T>
79 std::basic_ostream<char_type, traits_type>&
80 operator<<(std::basic_ostream<char_type, traits_type>& s,
81 const SGSphere<T>& sphere)
83 return s << "center = " << sphere.getCenter()
84 << ", radius = " << sphere.getRadius();