static gboolean
gimp_operation_cage_coef_calc_is_on_straight (GimpVector2 *d1,
GimpVector2 *d2,
GimpVector2 *p)
{
GimpVector2 v1, v2;
gfloat deter;
v1.x = p->x - d1->x;
v1.y = p->y - d1->y;
v2.x = d2->x - d1->x;
v2.y = d2->y - d1->y;
gimp_vector2_normalize (&v1);
gimp_vector2_normalize (&v2);
deter = v1.x * v2.y - v2.x * v1.y;
return (deter < 0.000000001) && (deter > -0.000000001);
}
/**
* gimp_vector2_normal_val:
* @vector: a #GimpVector2.
*
* This function is identical to gimp_vector2_normal() but the vector
* is passed by value rather than by reference.
*
* Returns: a #GimpVector2 perpendicular to @vector, with a length of 1.0.
*
* Since: 2.8
**/
GimpVector2
gimp_vector2_normal_val (GimpVector2 vector)
{
GimpVector2 result;
result.x = - vector.y;
result.y = vector.x;
gimp_vector2_normalize (&result);
return result;
}
/**
* gimp_vector2_normal:
* @vector: a pointer to a #GimpVector2.
*
* Compute a normalized perpendicular vector to @vector
*
* Returns: a #GimpVector2 perpendicular to @vector, with a length of 1.0.
*
* Since: 2.8
**/
GimpVector2
gimp_vector2_normal (GimpVector2 *vector)
{
GimpVector2 result;
result.x = - vector->y;
result.y = vector->x;
gimp_vector2_normalize (&result);
return result;
}