PostGIS  2.1.10dev-r@@SVN_REVISION@@
static int dot_product_side ( const POINT3D p,
const POINT3D q 
)
static

Utility function for edge_intersects(), signum with a tolerance in determining if the value is zero.

Definition at line 3081 of file lwgeodetic.c.

References dot_product(), and FP_IS_ZERO.

Referenced by edge_intersects().

3082 {
3083  double dp = dot_product(p, q);
3084 
3085  if ( FP_IS_ZERO(dp) )
3086  return 0;
3087 
3088  return dp < 0.0 ? -1 : 1;
3089 }
#define FP_IS_ZERO(A)
static double dot_product(const POINT3D *p1, const POINT3D *p2)
Convert cartesion coordinates on unit sphere to lon/lat coordinates static void cart2ll(const POINT3D...
Definition: lwgeodetic.c:397

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