2. Reference

typedef  struct  SclXy {
       Fixed32  x;
       Fixed32  y;
} SclXy;

typedef  struct  SclXyz {
      Fixed32   x;
      Fixed32   y;
      Fixed32   z;
} SclXyz;

typedef  struct  SclLineTb {
      Fixed32 h; / * Horizontal screen scroll value * /
      Fixed32 v; / * Vertical screen scroll value * /
      Fixed32 dh; / * Horizontal coordinate increment * /
} SclLineTb;

typedef  struct  SclLinWindowTb {
     Uint16 start; / * Horizontal start point coordinates * /
     Uint16 end; / * Horizontal end coordinate * /
} SclLinWindowTb;