gbox_overlaps()

int gbox_overlaps	(	const GBOX *	g1,
		const GBOX *	g2
	)

Return LW_TRUE if the GBOX overlaps, LW_FALSE otherwise.

Definition at line 295 of file g_box.c.

References GBOX::flags, FLAGS_GET_GEODETIC, FLAGS_GET_M, FLAGS_GET_Z, LW_FALSE, LW_TRUE, lwerror(), GBOX::mmax, GBOX::mmin, GBOX::xmax, GBOX::xmin, GBOX::ymax, GBOX::ymin, GBOX::zmax, and GBOX::zmin.

Referenced by lwgeom_distance_spheroid().

{

        /* Make sure our boxes are consistent */
        if ( FLAGS_GET_GEODETIC(g1->flags) != FLAGS_GET_GEODETIC(g2->flags) )
                lwerror("gbox_overlaps: cannot compare geodetic and non-geodetic boxes");

        /* Check X/Y first */
        if ( g1->xmax < g2->xmin || g1->ymax < g2->ymin ||
             g1->xmin > g2->xmax || g1->ymin > g2->ymax )
                return LW_FALSE;

        /* Deal with the geodetic case special: we only compare the geodetic boxes (x/y/z) */
        /* Never the M dimension */
        if ( FLAGS_GET_GEODETIC(g1->flags) && FLAGS_GET_GEODETIC(g2->flags) )
        {
                if ( g1->zmax < g2->zmin || g1->zmin > g2->zmax )
                        return LW_FALSE;
                else
                        return LW_TRUE;
        }

        /* If both geodetic or both have Z, check Z */
        if ( FLAGS_GET_Z(g1->flags) && FLAGS_GET_Z(g2->flags) )
        {
                if ( g1->zmax < g2->zmin || g1->zmin > g2->zmax )
                        return LW_FALSE;
        }

        /* If both have M, check M */
        if ( FLAGS_GET_M(g1->flags) && FLAGS_GET_M(g2->flags) )
        {
                if ( g1->mmax < g2->mmin || g1->mmin > g2->mmax )
                        return LW_FALSE;
        }

        return LW_TRUE;
}

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