CrystalSpace

Public API Reference

csgeom/plane3.h

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00001 /*
00002     Copyright (C) 1998,1999,2000 by Jorrit Tyberghein
00003     Largely rewritten by Ivan Avramovic <ivan@avramovic.com>
00004 
00005     This library is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or (at your option) any later version.
00009 
00010     This library is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015     You should have received a copy of the GNU Library General Public
00016     License along with this library; if not, write to the Free
00017     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00018 */
00019 
00020 #ifndef __CS_PLANE3_H__
00021 #define __CS_PLANE3_H__
00022 
00030 #include "csextern.h"
00031 
00032 #include "csgeom/vector3.h"
00033 
00034 class csString;
00035 
00041 class CS_CRYSTALSPACE_EXPORT csPlane3
00042 {
00043 public:
00045   csVector3 norm;
00046 
00048   float DD;
00049 
00053   csPlane3 () : norm(0,0,1), DD(0) {}
00054 
00058   csPlane3 (const csVector3& plane_norm, float d=0) : norm(plane_norm), DD(d) {}
00059 
00063   csPlane3 (float a, float b, float c, float d=0) : norm(a,b,c), DD(d) {}
00064 
00071   csPlane3 (const csVector3& v1, const csVector3& v2, const csVector3& v3);
00072 
00078   csPlane3 (const csVector3& v2, const csVector3& v3)
00079   {
00080     norm = v2 % v3; DD = 0;
00081   }
00082 
00084   inline csVector3& Normal () { return norm; }
00086   inline const csVector3& Normal () const { return norm; }
00087 
00089   inline float A () const { return norm.x; }
00091   inline float B () const { return norm.y; }
00093   inline float C () const { return norm.z; }
00095   inline float D () const { return DD; }
00096 
00098   inline float& A () { return norm.x; }
00100   inline float& B () { return norm.y; }
00102   inline float& C () { return norm.z; }
00104   inline float& D () { return DD; }
00105 
00107   inline const csVector3& GetNormal () const { return norm; }
00108 
00110   inline void Set (float a, float b, float c, float d)
00111   { norm.x = a; norm.y = b; norm.z = c; DD = d; }
00112 
00114   inline void Set (const csVector3& normal, float d)
00115   { norm = normal; DD = d; }
00116 
00123   void Set (const csVector3& v1, const csVector3& v2, const csVector3& v3);
00124 
00130   inline void Set (const csVector3& v2, const csVector3& v3)
00131   {
00132     norm = v2 % v3; DD = 0;
00133   }
00134 
00139   inline void SetOrigin (const csVector3& p)
00140   {
00141     DD = -norm * p;
00142   }
00143 
00154   inline float Classify (const csVector3& pt) const { return norm*pt+DD; }
00155 
00160   static float Classify (float A, float B, float C, float D,
00161                          const csVector3& pt)
00162   {
00163     return A*pt.x + B*pt.y + C*pt.z + D;
00164   }
00165 
00172   inline float Distance (const csVector3& pt) const
00173   { return ABS (Classify (pt)); }
00174 
00179   inline void Invert () { norm = -norm;  DD = -DD; }
00180 
00184   inline void Normalize ()
00185   {
00186     float f = norm.Norm ();
00187     if (f) { norm /= f;  DD /= f; }
00188   }
00189 
00193   csVector3 FindPoint () const;
00194 
00205   bool ClipPolygon (csVector3*& pverts, int& num_verts, bool reversed = false);
00206 
00208   csString Description() const;
00209 };
00210 
00213 #endif // __CS_PLANE3_H__
00214 

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