t3d.h

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/*
** ---------------------------------------------------------------
** t3d.h: 3D matrix transformations class definition.
**
** ---------------------------------------------------------------
*/

#ifndef _T3D_H
#define _T3D_H 

class T3d
{
 private:
/*
** ---------------------------------------------------------------
** Private data type definitions:
*/
  struct Vec {
    double    x;
    double    y;
    double    z;
   };

/*
** ---------------------------------------------------------------
** Private class variables:
**
*/
  static double mt[4][4];

/*
** ---------------------------------------------------------------
** Private class functions:
*/
/* --------------------------------------------------------------- */
  static inline double rad( double a )
  {
   return( a * 0.01745329252 );
  }

/* --------------------------------------------------------------- */
  static inline void VecUnit( Vec* a, Vec* b )
  {
   double len = sqrt(a->x*a->x + a->y*a->y + a->z*a->z);

   if( len != 0.0 )
   {
    b->x = a->x / len;
    b->y = a->y / len;
    b->z = a->z / len;
   }
  }

/* --------------------------------------------------------------- */
  static inline void VecCross( Vec* a, Vec* b, Vec* c )
  { 
   c->x = a->y * b->z - a->z * b->y;
   c->y = a->z * b->x - a->x * b->z;
   c->z = a->x * b->y - a->y * b->x;
  }

/* --------------------------------------------------------------- */
  static void Accumulate( double new_mt[4][4] );

 public:
/*
** ---------------------------------------------------------------
** Public class functions:
**
*/
/* --------------------------------------------------------------- */
  static void Transform( double* x, double* y, double* z );

/* --------------------------------------------------------------- */
  static void Identity( void );

/* --------------------------------------------------------------- */
  static void Scale( double sx, double sy, double sz );

/* --------------------------------------------------------------- */
  static void Translate( double tx, double ty, double tz );

/* --------------------------------------------------------------- */
  static void RotateBasis( double ux, double uy, double uz, 
                           double vx, double vy, double vz,
                           double wx, double wy, double wz );

/* --------------------------------------------------------------- */
  static void Camera( double eyex, double eyey, double eyez, 
                      double refx, double refy, double refz,
                      double vupx, double vupy, double vupz );

/* --------------------------------------------------------------- */
  static void Perspective( double d, double front, double back );

/* --------------------------------------------------------------- */
  static void NormalizeView( double left, double right,
                             double bottom, double top,
                             double front, double back );

};

#endif

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