gfx/povray/lathe.h

   1 /****************************************************************************
   2 *                   lathe.h
   3 *
   4 *  This module contains all defines, typedefs, and prototypes for LATHE.C.
   5 *
   6 *  from Persistence of Vision(tm) Ray Tracer
   7 *  Copyright 1996,1999 Persistence of Vision Team
   8 *---------------------------------------------------------------------------
   9 *  NOTICE: This source code file is provided so that users may experiment
  10 *  with enhancements to POV-Ray and to port the software to platforms other
  11 *  than those supported by the POV-Ray Team.  There are strict rules under
  12 *  which you are permitted to use this file.  The rules are in the file
  13 *  named POVLEGAL.DOC which should be distributed with this file.
  14 *  If POVLEGAL.DOC is not available or for more info please contact the POV-Ray
  15 *  Team Coordinator by email to team-coord@povray.org or visit us on the web at
  16 *  http://www.povray.org. The latest version of POV-Ray may be found at this site.
  17 *
  18 * This program is based on the popular DKB raytracer version 2.12.
  19 * DKBTrace was originally written by David K. Buck.
  20 * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
  21 *
  22 *****************************************************************************/
  23
  24 #ifndef LATHE_H
  25 #define LATHE_H
  26
  27 #include "bcyl.h"
  28
  29
  30 /*****************************************************************************
  31 * Global preprocessor definitions
  32 ******************************************************************************/
  33
  34 #define LATHE_OBJECT (STURM_OK_OBJECT)
  35
  36 #define LINEAR_SPLINE    1
  37 #define QUADRATIC_SPLINE 2
  38 #define CUBIC_SPLINE     3
  39 #define BEZIER_SPLINE    4
  40
  41 /* Generate additional lathe statistics. */
  42
  43 #define LATHE_EXTRA_STATS 1
  44
  45
  46
  47 /*****************************************************************************
  48 * Global typedefs
  49 ******************************************************************************/
  50
  51 typedef struct Lathe_Struct LATHE;
  52 typedef struct Lathe_Spline_Struct LATHE_SPLINE;
  53 typedef struct Lathe_Spline_Entry_Struct LATHE_SPLINE_ENTRY;
  54
  55 struct Lathe_Spline_Entry_Struct
  56 {
  57   UV_VECT A, B, C, D;  /* Coefficients of segment */
  58 };
  59
  60 struct Lathe_Spline_Struct
  61 {
  62   int References;             /* Count references to this structure. */
  63   LATHE_SPLINE_ENTRY *Entry;  /* Array of spline segments.           */
  64   BCYL *BCyl;                 /* bounding cylinder.                  */
  65 };
  66
  67 struct Lathe_Struct
  68 {
  69   OBJECT_FIELDS
  70   TRANSFORM *Trans;
  71   int Spline_Type;          /* Spline type (linear, quadratic ...)  */
  72   int Number;               /* Number of segments!!!                */
  73   LATHE_SPLINE *Spline;     /* Pointer to spline array              */
  74   DBL Height1, Height2;     /* Min./Max. height                     */
  75   DBL Radius1, Radius2;     /* Min./Max. radius                     */
  76 };
  77
  78
  79
  80 /*****************************************************************************
  81 * Global variables
  82 ******************************************************************************/
  83
  84
  85
  86
  87 /*****************************************************************************
  88 * Global functions
  89 ******************************************************************************/
  90
  91 void  Compute_Lathe_BBox (LATHE *Lathe);
  92 void  Compute_Lathe (LATHE *Lathe, UV_VECT *P);
  93 LATHE *Create_Lathe (void);
  94
  95 #endif