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 struct csVertexStatus;
00036 
00042 class CS_CRYSTALSPACE_EXPORT csPlane3
00043 {
00044 public:
00046   csVector3 norm;
00047 
00049   float DD;
00050 
00054   csPlane3 () : norm(0,0,1), DD(0) {}
00055 
00059   csPlane3 (const csVector3& plane_norm, float d=0) : norm(plane_norm), DD(d) {}
00060 
00064   csPlane3 (float a, float b, float c, float d=0) : norm(a,b,c), DD(d) {}
00065 
00072   csPlane3 (const csVector3& v1, const csVector3& v2, const csVector3& v3);
00073 
00079   csPlane3 (const csVector3& v2, const csVector3& v3)
00080   {
00081     norm = v2 % v3; DD = 0;
00082   }
00083 
00085   inline csVector3& Normal () { return norm; }
00087   inline const csVector3& Normal () const { return norm; }
00088 
00090   inline float A () const { return norm.x; }
00092   inline float B () const { return norm.y; }
00094   inline float C () const { return norm.z; }
00096   inline float D () const { return DD; }
00097 
00099   inline float& A () { return norm.x; }
00101   inline float& B () { return norm.y; }
00103   inline float& C () { return norm.z; }
00105   inline float& D () { return DD; }
00106 
00108   inline const csVector3& GetNormal () const { return norm; }
00109 
00111   inline void Set (float a, float b, float c, float d)
00112   { norm.x = a; norm.y = b; norm.z = c; DD = d; }
00113 
00115   inline void Set (const csVector3& normal, float d)
00116   { norm = normal; DD = d; }
00117 
00124   void Set (const csVector3& v1, const csVector3& v2, const csVector3& v3);
00125 
00131   inline void Set (const csVector3& v2, const csVector3& v3)
00132   {
00133     norm = v2 % v3; DD = 0;
00134   }
00135 
00140   inline void SetOrigin (const csVector3& p)
00141   {
00142     DD = -norm * p;
00143   }
00144 
00155   inline float Classify (const csVector3& pt) const { return norm*pt+DD; }
00156 
00161   static float Classify (float A, float B, float C, float D,
00162                          const csVector3& pt)
00163   {
00164     return A*pt.x + B*pt.y + C*pt.z + D;
00165   }
00166 
00173   inline float Distance (const csVector3& pt) const
00174   { return ABS (Classify (pt)); }
00175 
00180   inline void Invert () { norm = -norm;  DD = -DD; }
00181 
00185   inline void Normalize ()
00186   {
00187     float f = norm.Norm ();
00188     if (f) { norm /= f;  DD /= f; }
00189   }
00190 
00194   csVector3 FindPoint () const;
00195 
00205   bool ClipPolygon (csVector3*& pverts, int& num_verts, bool reversed = false);
00206 
00221   uint8 ClipPolygon (const csVector3* InVerts, size_t InCount,
00222     csVector3* OutPolygon, size_t& OutCount, csVertexStatus* OutStatus,
00223     bool reversed = false) const;
00224 
00226   csString Description() const;
00227 };
00228 
00231 #endif // __CS_PLANE3_H__
00232 

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