gre/3dclip.h

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#ifndef  INC_GRE_3DCLIP_H
#define  INC_GRE_3DCLIP_H

#ifndef  INC_MI32_POINT_H
   #include <mi32/point.h>
#endif

#ifndef  INC_MI32_DOUBLEAR_H
   #include <mi32/doublear.h>
#endif

namespace GRE {

class CLIPPING3D {
   public:

      enum PLANE {
         PLANE_X_P_W = 0,
         PLANE_X_M_W = 1,
         PLANE_Y_P_W = 2,
         PLANE_Y_M_W = 3,
         PLANE_Z_P_W = 4,
         PLANE_Z_M_W = 5,
         PLANE_Count = 6
         };

      static bool ClipPoint   (
         DPOINT3DH& point
         );

      static bool ClipSegment (
         DPOINT3DH& point1,
         DPOINT3DH& point2
         );


      static bool ClipPolygon (
         const DOUBLE_ARRAY<DPOINT3DH>& input,
         DOUBLE_ARRAY<DPOINT3DH>& output
         );

   private:
      #ifndef GENERATING_DOXYGEN_OUTPUT

      static bool Check (
         const double w1,
         const double w2,
         double& tmin,
         double& tmax
         );

      static bool ClipToPlane (
         const PLANE plane,
         const DOUBLE_ARRAY<DPOINT3DH>& input,
         DOUBLE_ARRAY<DPOINT3DH>& output
         );

      static bool CheckAbove (
         const double value
         ) { return (value > 0.0); }

      static bool AbovePlane  (
         const PLANE plane,
         const DPOINT3DH& point
         );

      static DPOINT3DH IntersectPlane  (
         const PLANE plane,
         const DPOINT3DH& point1,
         const DPOINT3DH& point2
         );

      static bool Intersect (
         const double w1,
         const double w2,
         double& t
         );

      #endif 
   };

};    

#endif

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