Function point_cross

maputil.c:1686–1688

vector cross product (warning: z and m dimensions are ignored!) */

/* vector cross product (warning: z and m dimensions are ignored!) */
static double point_cross(const pointObj a, const pointObj b) {
  return a.x*b.y-a.y*b.x;
}

/* 
** For offset corner point calculation 1/sin() is used