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.
22 # pragma GCC diagnostic ignored "-Wuninitialized" SGSphere();
30 * Do not initialize _center to save unneeded initialization time.
31 * Fix 'may be used uninitialized' warnings locally instead
33 // _center(0.0, 0.0, 0.0),
36 SGSphere(const SGVec3<T>& center, const T& radius) :
41 explicit SGSphere(const SGSphere<S>& sphere) :
42 _center(sphere.getCenter()),
43 _radius(sphere.getRadius())
46 const SGVec3<T>& getCenter() const
48 void setCenter(const SGVec3<T>& center)
51 const T& getRadius() const
53 void setRadius(const T& radius)
56 { return _radius*_radius; }
62 { return 0 <= _radius; }
67 void expandBy(const SGVec3<T>& v)
75 T dist2 = distSqr(_center, v);
76 if (dist2 <= getRadius2())
80 T newRadius = T(0.5)*(_radius + dist);
81 _center += ((newRadius - _radius)/dist)*(v - _center);
85 void expandBy(const SGSphere<T>& s)
91 _center = s.getCenter();
92 _radius = s.getRadius();
96 T dist = length(_center - s.getCenter());
97 if (dist <= SGLimits<T>::min()) {
98 _radius = SGMisc<T>::max(_radius, s._radius);
103 if (dist + s.getRadius() <= _radius)
106 // new one includes all
107 if (dist + _radius <= s.getRadius()) {
108 _center = s.getCenter();
109 _radius = s.getRadius();
113 T newRadius = T(0.5)*(_radius + dist + s.getRadius());
114 T ratio = (newRadius - _radius) / dist;
117 _center[0] += ratio*(s._center[0] - _center[0]);
118 _center[1] += ratio*(s._center[1] - _center[1]);
119 _center[2] += ratio*(s._center[2] - _center[2]);
122 void expandBy(const SGBox<T>& box)
128 _center = box.getCenter();
129 _radius = T(0.5)*length(box.getSize());
133 SGVec3<T> boxCenter = box.getCenter();
135 for (unsigned i = 0; i < 3; ++i) {
136 if (_center[i] < boxCenter[i])
137 corner[i] = box.getMax()[i];
139 corner[i] = box.getMin()[i];
149 /// Output to an ostream
150 template<typename char_type, typename traits_type, typename T>
152 std::basic_ostream<char_type, traits_type>&
153 operator<<(std::basic_ostream<char_type, traits_type>& s,
154 const SGSphere<T>& sphere)
156 return s << "center = " << sphere.getCenter()
157 << ", radius = " << sphere.getRadius();