ccstruct/vecfuncs.h File Reference

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

Go to the source code of this file.

Defines

• #define CROSS(a, b)   ((a).x * (b).y - (a).y * (b).x)
• #define LENGTH(a)   ((a).x * (a).x + (a).y * (a).y)
• #define point_diff(p, p1, p2)
• #define SCALAR(a, b)   ((a).x * (b).x + (a).y * (b).y)

Functions

• int direction (EDGEPT *point)

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Define Documentation

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

cross product

Definition at line 41 of file vecfuncs.h.

#define LENGTH

(

a

)

((a).x * (a).x + (a).y * (a).y)

length of vector

Definition at line 53 of file vecfuncs.h.

#define point_diff	(	p,
		p1,
		p2		)

Value:

((p).x = (p1).x - (p2).x,        \
   (p).y = (p1).y - (p2).y,        \
   (p))

Return the difference from point (p1) to point (p2). Put the value into point (p).

Definition at line 33 of file vecfuncs.h.

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

scalar vector product

Definition at line 47 of file vecfuncs.h.

Referenced by angle_change().

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Function Documentation

int direction

(

EDGEPT *

point

)

Show if the line is going in the positive or negative X direction.

direction to return

prev point

next point

Definition at line 34 of file vecfuncs.cpp.

References edgeptstruct::next, edgeptstruct::pos, edgeptstruct::prev, and TPOINT::x.

Referenced by add_new_edge(), new_max_point(), new_min_point(), print_dawg_node(), and prioritize_points().

                             {
  int dir;                       
  EDGEPT *prev;                  
  EDGEPT *next;                  
  dir = 0;
  prev = point->prev;
  next = point->next;

  if (((prev->pos.x <= point->pos.x) &&
    (point->pos.x < next->pos.x)) ||
    ((prev->pos.x < point->pos.x) && (point->pos.x <= next->pos.x)))
    dir = 1;

  if (((prev->pos.x >= point->pos.x) &&
    (point->pos.x > next->pos.x)) ||
    ((prev->pos.x > point->pos.x) && (point->pos.x >= next->pos.x)))
    dir = -1;

  return dir;
}

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