PostGIS  2.1.10dev-r@@SVN_REVISION@@
void normalize ( POINT3D p)

Normalize to a unit vector.

Definition at line 564 of file lwgeodetic.c.

References FP_IS_ZERO, POINT3D::x, POINT3D::y, and POINT3D::z.

Referenced by circ_center_cartesian(), circ_node_leaf_new(), clairaut_geographic(), edge_calculate_gbox_slow(), edge_distance_to_point(), edge_intersection(), edge_point_in_cone(), edge_point_side(), gbox_angular_height(), gbox_centroid(), gbox_pt_outside(), point_in_cone(), ptarray_segmentize_sphere(), sphere_angle(), test_vector_angle(), unit_normal(), vector_angle(), and vector_rotate().

565 {
566  double d = sqrt(p->x*p->x + p->y*p->y + p->z*p->z);
567  if (FP_IS_ZERO(d))
568  {
569  p->x = p->y = p->z = 0.0;
570  return;
571  }
572  p->x = p->x / d;
573  p->y = p->y / d;
574  p->z = p->z / d;
575  return;
576 }
double y
Definition: liblwgeom.h:296
double x
Definition: liblwgeom.h:296
#define FP_IS_ZERO(A)
double z
Definition: liblwgeom.h:296

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