dot_product_side()

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 3526 of file lwgeodetic.c.

{
        double dp = dot_product(p, q);
 
        if ( FP_IS_ZERO(dp) )
                return 0;
 
        return dp < 0.0 ? -1 : 1;
}

References dot_product(), and FP_IS_ZERO.

Referenced by edge_intersects().

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