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rotbox.h

00001 // rotbox.h (A box with arbitrary orientation)
00002 //
00003 //  The WorldForge Project
00004 //  Copyright (C) 2000, 2001  The WorldForge Project
00005 //
00006 //  This program is free software; you can redistribute it and/or modify
00007 //  it under the terms of the GNU General Public License as published by
00008 //  the Free Software Foundation; either version 2 of the License, or
00009 //  (at your option) any later version.
00010 //
00011 //  This program is distributed in the hope that it will be useful,
00012 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 //  GNU General Public License for more details.
00015 //
00016 //  You should have received a copy of the GNU General Public License
00017 //  along with this program; if not, write to the Free Software
00018 //  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00019 //
00020 //  For information about WorldForge and its authors, please contact
00021 //  the Worldforge Web Site at http://www.worldforge.org.
00022 //
00023 
00024 // Author: Ron Steinke
00025 
00026 #ifndef WFMATH_ROT_BOX_H
00027 #define WFMATH_ROT_BOX_H
00028 
00029 #include <wfmath/const.h>
00030 #include <wfmath/vector.h>
00031 #include <wfmath/point.h>
00032 #include <wfmath/rotmatrix.h>
00033 #include <wfmath/axisbox.h>
00034 #include <wfmath/ball.h>
00035 #include <wfmath/intersect_decls.h>
00036 
00037 namespace WFMath {
00038 
00039 template<const int dim> class RotBox;
00040 
00041 template<const int dim>
00042 std::ostream& operator<<(std::ostream& os, const RotBox<dim>& r);
00043 template<const int dim>
00044 std::istream& operator>>(std::istream& is, RotBox<dim>& r);
00045 
00047 
00051 template<const int dim>
00052 class RotBox
00053 {
00054  public:
00056   RotBox() {}
00058 
00063   RotBox(const Point<dim>& p, const Vector<dim>& size,
00064          const RotMatrix<dim>& orientation) : m_corner0(p), m_size(size),
00065                 m_orient(orientation) {}
00067   RotBox(const RotBox& b) : m_corner0(b.m_corner0), m_size(b.m_size),
00068                 m_orient(b.m_orient) {}
00069 
00070   ~RotBox() {}
00071 
00072   friend std::ostream& operator<< <dim>(std::ostream& os, const RotBox& r);
00073   friend std::istream& operator>> <dim>(std::istream& is, RotBox& r);
00074 
00075   RotBox& operator=(const RotBox& s);
00076 
00077   bool isEqualTo(const RotBox& b, double epsilon = WFMATH_EPSILON) const;
00078 
00079   bool operator==(const RotBox& b) const        {return isEqualTo(b);}
00080   bool operator!=(const RotBox& b) const        {return !isEqualTo(b);}
00081 
00082   bool isValid() const {return m_corner0.isValid() && m_size.isValid()
00083         && m_orient.isValid();}
00084 
00085   bool operator< (const RotBox& b) const;
00086 
00087   // Descriptive characteristics
00088 
00089   int numCorners() const {return 1 << dim;}
00090   Point<dim> getCorner(int i) const;
00091   Point<dim> getCenter() const {return m_corner0 + Prod(m_size / 2, m_orient);}
00092 
00094   const Point<dim>& corner0() const             {return m_corner0;}
00096   Point<dim>& corner0()                         {return m_corner0;}
00098   const Vector<dim>& size() const               {return m_size;}
00100   Vector<dim>& size()                           {return m_size;}
00102   const RotMatrix<dim>& orientation() const     {return m_orient;}
00104   RotMatrix<dim>& orientation()                 {return m_orient;}
00105 
00106   // Movement functions
00107 
00108   RotBox& shift(const Vector<dim>& v)
00109         {m_corner0 += v; return *this;}
00110   RotBox& moveCornerTo(const Point<dim>& p, int corner)
00111         {return shift(p - getCorner(corner));}
00112   RotBox& moveCenterTo(const Point<dim>& p)
00113         {return shift(p - getCenter());}
00114 
00115   RotBox& rotateCorner(const RotMatrix<dim>& m, int corner)
00116         {rotatePoint(m, getCorner(corner)); return *this;}
00117   RotBox& rotateCenter(const RotMatrix<dim>& m)
00118         {rotatePoint(m, getCenter()); return *this;}
00119   RotBox& rotatePoint(const RotMatrix<dim>& m, const Point<dim>& p)
00120         {m_orient = Prod(m_orient, m); m_corner0.rotate(m, p); return *this;}
00121 
00122   // Intersection functions
00123 
00124   AxisBox<dim> boundingBox() const;
00125   Ball<dim> boundingSphere() const
00126         {return Ball<dim>(getCenter(), m_size.mag() / 2);}
00127   Ball<dim> boundingSphereSloppy() const
00128         {return Ball<dim>(getCenter(), m_size.sqrMag() / 2);}
00129 
00130   friend bool Intersect<dim>(const RotBox& r, const Point<dim>& p, bool proper);
00131   friend bool Contains<dim>(const Point<dim>& p, const RotBox& r, bool proper);
00132 
00133   friend bool Intersect<dim>(const RotBox& r, const AxisBox<dim>& b, bool proper);
00134   friend bool Contains<dim>(const RotBox& r, const AxisBox<dim>& b, bool proper);
00135   friend bool Contains<dim>(const AxisBox<dim>& b, const RotBox& r, bool proper);
00136 
00137   friend bool Intersect<dim>(const RotBox& r, const Ball<dim>& b, bool proper);
00138   friend bool Contains<dim>(const RotBox& r, const Ball<dim>& b, bool proper);
00139   friend bool Contains<dim>(const Ball<dim>& b, const RotBox& r, bool proper);
00140 
00141   friend bool Intersect<dim>(const RotBox& r, const Segment<dim>& s, bool proper);
00142   friend bool Contains<dim>(const RotBox& r, const Segment<dim>& s, bool proper);
00143   friend bool Contains<dim>(const Segment<dim>& s, const RotBox& r, bool proper);
00144 
00145   friend bool Intersect<dim>(const RotBox& r1, const RotBox& r2, bool proper);
00146   friend bool Contains<dim>(const RotBox& outer, const RotBox& inner, bool proper);
00147 
00148   friend bool Intersect<dim>(const Polygon<dim>& p, const RotBox& r, bool proper);
00149   friend bool Contains<dim>(const Polygon<dim>& p, const RotBox& r, bool proper);
00150   friend bool Contains<dim>(const RotBox& r, const Polygon<dim>& p, bool proper);
00151 
00152  private:
00153 
00154   Point<dim> m_corner0;
00155   Vector<dim> m_size;
00156   RotMatrix<dim> m_orient;
00157 };
00158 
00159 } // namespace WFMath
00160 
00161 #include <wfmath/rotbox_funcs.h>
00162 
00163 #endif  // WFMATH_ROT_BOX_H

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