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# 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