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Annotation of q_a/samples/spincube/paint.h, revision 1.1

1.1     ! root        1: /************************************************************************\
        !             2: *
        !             3: *  PAINT.H
        !             4: *
        !             5: \************************************************************************/
        !             6: 
        !             7: 
        !             8: 
        !             9: /************************************************************************\
        !            10: *                          SYMBOLIC CONSTANTS
        !            11: \************************************************************************/
        !            12: 
        !            13: #define  NUMVERTICES  8 /* number of polyhedron vertices */
        !            14: #define  NUMFACETS    6 /* number of polyhedron facets   */
        !            15: 
        !            16: #define  MAX_POINTS_PER_FACET 4
        !            17: 
        !            18: #define  XROT_INCREMENT  (float) 0.0872  /* 5  degrees */
        !            19: #define  YROT_INCREMENT  (float) 0.1744  /* 10 degrees */
        !            20: #define  ZROT_INCREMENT  (float) 0.2617  /* 15 degrees */
        !            21: 
        !            22: 
        !            23: 
        !            24: /************************************************************************\
        !            25: *                              TYPEDEFs
        !            26: \************************************************************************/
        !            27: 
        !            28: typedef struct { LONG x, y, z; } POINT3D;
        !            29: 
        !            30: 
        !            31: 
        !            32: /************************************************************************\
        !            33: *                          GLOBAL VARIABLES
        !            34: \************************************************************************/
        !            35: 
        !            36: /*  This particular set of vertices ("v") and facets describe a normalized
        !            37:  *  cube centered about the origin. The facet list is made up of a series
        !            38:  *  of indexes into the array of vertices, each describing an individual
        !            39:  *  facet (eg. a polygon), and are separated by -1. Note that the facets
        !            40:  *  are decribed in COUNTERCLOCKWISE order (so we can consistently find
        !            41:  *  the normal to any given facet).
        !            42:  */
        !            43: static POINT3D v[NUMVERTICES] = {{ 1, 1, 1}, { 1,-1, 1},
        !            44:                                  {-1,-1, 1}, {-1, 1, 1},
        !            45:                                  { 1, 1,-1}, { 1,-1,-1},
        !            46:                                  {-1,-1,-1}, {-1, 1,-1}  };
        !            47: 
        !            48: 
        !            49: static int facets[30] = { 3, 2, 1, 0, -1,
        !            50:                           4, 5, 6, 7, -1,
        !            51:                           0, 1, 5, 4, -1,
        !            52:                           6, 2, 3, 7, -1,
        !            53:                           7, 3, 0, 4, -1,
        !            54:                           5, 1, 2, 6, -1  };
        !            55: 
        !            56: POINT3D xv[NUMVERTICES]; /* will hold the transformed points in "v" */
        !            57: 
        !            58: float   m[2][3]; /* the transformation matrix */
        !            59: 
        !            60: 
        !            61: 
        !            62: /************************************************************************\
        !            63: *                         FUNCTION PROTOTYPES
        !            64: \************************************************************************/
        !            65: 
        !            66: void ComputeXform  (float, float, float);
        !            67: void XformVertices (int, int);

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