proj3d.h

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/*----------------------------------------------------------------------
  File    : proj3d.h
  Contents: projection of 3D points to a 2D plane
  Author  : Christian Borgelt
  History : 19.10.2000 file created from file drawing.h
            10.12.2000 function p3d_visib added
            15.06.2001 complete redesign
            09.07.2001 done some renaming for Windows (near/far)
----------------------------------------------------------------------*/
#ifndef __PROJ3D__
#define __PROJ3D__

/*----------------------------------------------------------------------
  Preprocessor Definitions
----------------------------------------------------------------------*/
#define P3D_VIEW   0x01         /* rotate view */
#define P3D_EYE    0x02         /* rotate eye  */
#define P3D_BOTH   0x03         /* rotate both */

/*----------------------------------------------------------------------
  Type Definitions
----------------------------------------------------------------------*/
typedef struct {                /* --- view in 3D --- */
  double eye[3];                /* eye (point to look from) */
  double cx[3], cy[3], cz[3];   /* coordinate cross for view */
  double dnear, dfar;           /* near/far plane of viewing frustrum */
  double dpp;                   /* distance to projection plane */
} VIEW3D;                       /* (view in 3D) */

typedef struct {                /* --- 3D to 2D projection --- */
  VIEW3D curr;                  /* current view */
  VIEW3D save;                  /* saved view (p3d_save/p3d_restore) */
} PROJ3D;                       /* (3D to 2D projection) */

/*----------------------------------------------------------------------
  Functions
----------------------------------------------------------------------*/
extern PROJ3D* p3d_create  (void);
extern void    p3d_delete  (PROJ3D *p3d);

extern void    p3d_eye     (PROJ3D *p3d, double x, double y, double z);
extern void    p3d_view    (PROJ3D *p3d, double h, double p, double r);
extern void    p3d_frust   (PROJ3D *p3d, double fov,
                            double dnear, double dfar);

extern void    p3d_save    (PROJ3D *p3d);
extern void    p3d_restore (PROJ3D *p3d);

extern void    p3d_move    (PROJ3D *p3d, double x, double y, double z);
extern void    p3d_yaw     (PROJ3D *p3d, double phi, int mode);
extern void    p3d_pitch   (PROJ3D *p3d, double phi, int mode);
extern void    p3d_roll    (PROJ3D *p3d, double phi, int mode);

extern int     p3d_proj    (PROJ3D *p3d, double x, double y, double z,
                            double *px, double *py);
extern int     p3d_visib   (PROJ3D *p3d, double x, double y, double z,
                            double nx, double ny, double nz);

/*----------------------------------------------------------------------
  Preprocessor Definitions
----------------------------------------------------------------------*/
#define p3d_delete(p)      free(p)
#define p3d_save(p)        ((p)->save = (p)->curr)
#define p3d_restore(p)     ((p)->curr = (p)->save)

#endif