plane3.h Source File

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 
00023 #ifndef __CS_CSSYSDEFS_H__
00024 #error "cssysdef.h must be included in EVERY source file!"
00025 #endif
00026 
00027 #include "csgeom/vector3.h"
00028 
00034 class csPlane3
00035 {
00036 public:
00038   csVector3 norm;
00039 
00041   float DD;
00042 
00046   csPlane3 () : norm(0,0,1), DD(0) {}
00047 
00051   csPlane3 (const csVector3& plane_norm, float d=0) : norm(plane_norm), DD(d) {}
00052 
00056   csPlane3 (float a, float b, float c, float d=0) : norm(a,b,c), DD(d) {}
00057 
00064   csPlane3 (const csVector3& v1, const csVector3& v2, const csVector3& v3);
00065 
00071   csPlane3 (const csVector3& v2, const csVector3& v3)
00072   {
00073     norm = v2 % v3; DD = 0;
00074   }
00075 
00077   inline csVector3& Normal () { return norm; }
00079   inline const csVector3& Normal () const { return norm; }
00080 
00082   inline float A () const { return norm.x; }
00084   inline float B () const { return norm.y; }
00086   inline float C () const { return norm.z; }
00088   inline float D () const { return DD; }
00089 
00091   inline float& A () { return norm.x; }
00093   inline float& B () { return norm.y; }
00095   inline float& C () { return norm.z; }
00097   inline float& D () { return DD; }
00098 
00100   inline void Set (float a, float b, float c, float d)
00101   { norm.x = a; norm.y = b; norm.z = c; DD = d; }
00102 
00104   inline void Set (const csVector3& normal, float d)
00105   { norm = normal; DD = d; }
00106 
00113   void Set (const csVector3& v1, const csVector3& v2, const csVector3& v3);
00114 
00120   void Set (const csVector3& v2, const csVector3& v3)
00121   {
00122     norm = v2 % v3; DD = 0;
00123   }
00124 
00135   inline float Classify (const csVector3& pt) const { return norm*pt+DD; }
00136 
00141   static float Classify (float A, float B, float C, float D,
00142                          const csVector3& pt)
00143   {
00144     return A*pt.x + B*pt.y + C*pt.z + D;
00145   }
00146 
00153   inline float Distance (const csVector3& pt) const
00154   { return ABS (Classify (pt)); }
00155 
00160   void Invert () { norm = -norm;  DD = -DD; }
00161 
00165   void Normalize ()
00166   {
00167     float f = norm.Norm ();
00168     if (f) { norm /= f;  DD /= f; }
00169   }
00170 
00181   bool ClipPolygon (csVector3*& pverts, int& num_verts, bool reversed = false);
00182 };
00183 
00184 #endif // __CS_PLANE3_H__
00185