ccstruct/vecfuncs.h

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#ifndef VECFUNCS_H
#define VECFUNCS_H

#include "tessclas.h"
#include <math.h>

/*----------------------------------------------------------------------
              M a c r o s
----------------------------------------------------------------------*/
#define point_diff(p,p1,p2)  \
((p).x = (p1).x - (p2).x,        \
   (p).y = (p1).y - (p2).y,        \
   (p))

#define CROSS(a,b) \
((a).x * (b).y - (a).y * (b).x)

#define SCALAR(a,b) \
((a).x * (b).x + (a).y * (b).y)

#define LENGTH(a) \
((a).x * (a).x + (a).y * (a).y)

/*----------------------------------------------------------------------
              F u n c t i o n s
----------------------------------------------------------------------*/
int direction(EDGEPT *point); 

/*
#if defined(__STDC__) || defined(__cplusplus) || MAC_OR_DOS
# define _ARGS(s) s
#else
# define _ARGS(s) ()
#endif*/

/* vecfuncs.c
int direction
  _ARGS((EDGEPT *point));

#undef _ARGS
*/
#endif

---