geography_tree_distance()

int geography_tree_distance	(	const GSERIALIZED *	g1,
		const GSERIALIZED *	g2,
		const SPHEROID *	s,
		double	tolerance,
		double *	distance
	)

Definition at line 290 of file geography_measurement_trees.c.

References circ_tree_distance_tree(), circ_tree_free(), CircTreePIP(), LW_SUCCESS, lwgeom_calculate_circ_tree(), lwgeom_free(), lwgeom_from_gserialized(), and lwgeom_startpoint().

Referenced by geography_distance_tree().

{
        CIRC_NODE* circ_tree1 = NULL;
        CIRC_NODE* circ_tree2 = NULL;
        LWGEOM* lwgeom1 = NULL;
        LWGEOM* lwgeom2 = NULL;
        POINT4D pt1, pt2;

        lwgeom1 = lwgeom_from_gserialized(g1);
        lwgeom2 = lwgeom_from_gserialized(g2);
        circ_tree1 = lwgeom_calculate_circ_tree(lwgeom1);
        circ_tree2 = lwgeom_calculate_circ_tree(lwgeom2);
        lwgeom_startpoint(lwgeom1, &pt1);
        lwgeom_startpoint(lwgeom2, &pt2);

        if ( CircTreePIP(circ_tree1, g1, &pt2) || CircTreePIP(circ_tree2, g2, &pt1) )
        {
                *distance = 0.0;
        }
        else
        {
                /* Calculate tree/tree distance */
                *distance = circ_tree_distance_tree(circ_tree1, circ_tree2, s, tolerance);
        }

        circ_tree_free(circ_tree1);
        circ_tree_free(circ_tree2);
        lwgeom_free(lwgeom1);
        lwgeom_free(lwgeom2);
        return LW_SUCCESS;
}

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