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C/C++ Source or Header  |  1992-07-03  |  2.8 KB  |  97 lines
  1. /****************************************************************************
  2. *                viewpnt.c
  3. *
  4. *  This module implements methods for managing the viewpoint.
  5. *
  6. *  from Persistence of Vision Raytracer 
  7. *  Copyright 1992 Persistence of Vision Team
  8. *---------------------------------------------------------------------------
  9. *  Copying, distribution and legal info is in the file povlegal.doc which
  10. *  should be distributed with this file. If povlegal.doc is not available
  11. *  or for more info please contact:
  12. *
  13. *       Drew Wells [POV-Team Leader] 
  14. *       CIS: 73767,1244  Internet: 73767.1244@compuserve.com
  15. *       Phone: (213) 254-4041
  16. * 
  17. * This program is based on the popular DKB raytracer version 2.12.
  18. * DKBTrace was originally written by David K. Buck.
  19. * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
  20. *
  21. *****************************************************************************/
  22.  
  23. #include "frame.h"
  24. #include "vector.h"
  25. #include "povproto.h"
  26.  
  27. METHODS Viewpoint_Methods =
  28. { NULL, NULL, NULL, NULL, Copy_Viewpoint,
  29.    Translate_Viewpoint, Rotate_Viewpoint,
  30.    Scale_Viewpoint, NULL};
  31.  
  32. void *Copy_Viewpoint (Object)
  33. OBJECT *Object;
  34. {
  35.    VIEWPOINT *Viewpoint = (VIEWPOINT *) Object;
  36.    VIEWPOINT *New_Viewpoint;
  37.  
  38.    New_Viewpoint = Get_Viewpoint();
  39.  
  40.    New_Viewpoint -> Location = Viewpoint -> Location;
  41.    New_Viewpoint -> Direction = Viewpoint -> Direction;
  42.    New_Viewpoint -> Right = Viewpoint -> Right;
  43.    New_Viewpoint -> Up = Viewpoint -> Up;
  44.    return (New_Viewpoint);
  45. }
  46.  
  47. void Translate_Viewpoint (Object, Vector)
  48. OBJECT *Object;
  49. VECTOR *Vector;
  50. {
  51.    VAdd (((VIEWPOINT *) Object) -> Location, 
  52.       ((VIEWPOINT *) Object) -> Location,
  53.       *Vector);
  54. }
  55.  
  56. void Rotate_Viewpoint (Object, Vector)
  57. OBJECT *Object;
  58. VECTOR *Vector;
  59. {
  60.    TRANSFORMATION Transformation;
  61.    VIEWPOINT *Viewpoint = (VIEWPOINT *) Object;
  62.  
  63.    Get_Rotation_Transformation(&Transformation, Vector);
  64.    MTransformVector (&(Viewpoint -> Location),
  65.       &(Viewpoint -> Location), &Transformation);
  66.  
  67.    MTransformVector (&(Viewpoint -> Direction),
  68.       &(Viewpoint -> Direction), &Transformation);
  69.  
  70.    MTransformVector (&(Viewpoint -> Up),
  71.       &(Viewpoint -> Up), &Transformation);
  72.  
  73.    MTransformVector (&(Viewpoint -> Right),
  74.       &(Viewpoint -> Right), &Transformation);
  75. }
  76.  
  77. void Scale_Viewpoint (Object, Vector)
  78. OBJECT *Object;
  79. VECTOR *Vector;
  80. {
  81.    TRANSFORMATION Transformation;
  82.    VIEWPOINT *Viewpoint = (VIEWPOINT *) Object;
  83.  
  84.    Get_Scaling_Transformation(&Transformation, Vector);
  85.    MTransformVector (&(Viewpoint -> Location),
  86.       &(Viewpoint -> Location), &Transformation);
  87.  
  88.    MTransformVector (&(Viewpoint -> Direction),
  89.       &(Viewpoint -> Direction), &Transformation);
  90.  
  91.    MTransformVector (&(Viewpoint -> Up),
  92.       &(Viewpoint -> Up), &Transformation);
  93.  
  94.    MTransformVector (&(Viewpoint -> Right),
  95.       &(Viewpoint -> Right), &Transformation);
  96. }
  97.