vecfuncs.h File Reference

#include <math.h>

Go to the source code of this file.

Macros
#define	point_diff(p, p1, p2)
#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)

Functions
int	direction (EDGEPT *point)

Macro Definition Documentation

CROSS

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

Definition at line 52 of file vecfuncs.h.

LENGTH

#define LENGTH

(

a

)

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

Definition at line 70 of file vecfuncs.h.

point_diff

#define point_diff	(		p,
			p1,
			p2
	)

Value:

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

Definition at line 42 of file vecfuncs.h.

SCALAR

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

Definition at line 61 of file vecfuncs.h.

Function Documentation

direction()

int direction

(

EDGEPT *

point

)

direction to return

prev point

next point

Definition at line 43 of file vecfuncs.cpp.

                             {
  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;
}