lw_dist2d_distancepoint()

LWGEOM* lw_dist2d_distancepoint	(	const LWGEOM *	lw1,
		const LWGEOM *	lw2,
		int32_t	srid,
		int	mode
	)

Function initializing closestpoint calculations.

Definition at line 143 of file measures.c.

{
        double x, y;
        DISTPTS thedl;
        double initdistance = FLT_MAX;
        LWGEOM *result;
 
        thedl.mode = mode;
        thedl.distance = initdistance;
        thedl.tolerance = 0;
 
        LWDEBUG(2, "lw_dist2d_distancepoint is called");
 
        if (!lw_dist2d_comp(lw1, lw2, &thedl))
        {
                /*should never get here. all cases ought to be error handled earlier*/
                lwerror("Some unspecified error.");
                result = (LWGEOM *)lwcollection_construct_empty(COLLECTIONTYPE, srid, 0, 0);
        }
        if (thedl.distance == initdistance)
        {
                LWDEBUG(3, "didn't find geometries to measure between, returning null");
                result = (LWGEOM *)lwcollection_construct_empty(COLLECTIONTYPE, srid, 0, 0);
        }
        else
        {
                x = thedl.p1.x;
                y = thedl.p1.y;
                result = (LWGEOM *)lwpoint_make2d(srid, x, y);
        }
        return result;
}

References COLLECTIONTYPE, DISTPTS::distance, lw_dist2d_comp(), lwcollection_construct_empty(), LWDEBUG, lwerror(), lwpoint_make2d(), DISTPTS::mode, DISTPTS::p1, result, DISTPTS::tolerance, POINT2D::x, pixval::x, POINT2D::y, and pixval::y.

Referenced by lw_dist3d_distancepoint(), lwgeom_closest_point(), and lwgeom_furthest_point().

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