touches()

Datum touches

(

PG_FUNCTION_ARGS

)

Definition at line 2508 of file postgis/lwgeom_geos.c.

References disjoint(), error_if_srid_mismatch(), errorIfGeometryCollection(), FALSE, gbox_overlaps_2d(), gserialized_get_gbox_p(), gserialized_get_srid(), gserialized_is_empty(), HANDLE_GEOS_ERROR, LW_FALSE, lwgeom_geos_error(), PG_FUNCTION_INFO_V1(), and POSTGIS2GEOS().

Referenced by geos_intersects().

{
        GSERIALIZED *geom1;
        GSERIALIZED *geom2;
        GEOSGeometry *g1, *g2;
        char result;
        GBOX box1, box2;

        geom1 = PG_GETARG_GSERIALIZED_P(0);
        geom2 = PG_GETARG_GSERIALIZED_P(1);

        errorIfGeometryCollection(geom1,geom2);
        error_if_srid_mismatch(gserialized_get_srid(geom1), gserialized_get_srid(geom2));

        /* A.Touches(Empty) == FALSE */
        if ( gserialized_is_empty(geom1) || gserialized_is_empty(geom2) )
                PG_RETURN_BOOL(false);

        /*
         * short-circuit 1: if geom2 bounding box does not overlap
         * geom1 bounding box we can prematurely return FALSE.
         */
        if ( gserialized_get_gbox_p(geom1, &box1) &&
                        gserialized_get_gbox_p(geom2, &box2) )
        {
                if ( gbox_overlaps_2d(&box1, &box2) == LW_FALSE )
                {
                        PG_RETURN_BOOL(FALSE);
                }
        }

        initGEOS(lwpgnotice, lwgeom_geos_error);

        g1 = (GEOSGeometry *)POSTGIS2GEOS(geom1 );
        if ( 0 == g1 )   /* exception thrown at construction */
        {
                HANDLE_GEOS_ERROR("First argument geometry could not be converted to GEOS");
                PG_RETURN_NULL();
        }

        g2 = (GEOSGeometry *)POSTGIS2GEOS(geom2 );
        if ( 0 == g2 )   /* exception thrown at construction */
        {
                HANDLE_GEOS_ERROR("Second argument geometry could not be converted to GEOS");
                GEOSGeom_destroy(g1);
                PG_RETURN_NULL();
        }

        result = GEOSTouches(g1,g2);

        GEOSGeom_destroy(g1);
        GEOSGeom_destroy(g2);

        if (result == 2)
        {
                HANDLE_GEOS_ERROR("GEOSTouches");
                PG_RETURN_NULL(); /* never get here */
        }

        PG_FREE_IF_COPY(geom1, 0);
        PG_FREE_IF_COPY(geom2, 1);

        PG_RETURN_BOOL(result);
}

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