gbox_merge()

int gbox_merge	(	const GBOX *	new_box,
		GBOX *	merge_box
	)

Update the merged GBOX to be large enough to include itself and the new box.

Definition at line 269 of file g_box.c.

References GBOX::flags, FLAGS_GET_GEODETIC, FLAGS_GET_M, FLAGS_GET_Z, FLAGS_GET_ZM, LW_FAILURE, LW_SUCCESS, GBOX::mmax, GBOX::mmin, GBOX::xmax, GBOX::xmin, GBOX::ymax, GBOX::ymin, GBOX::zmax, and GBOX::zmin.

Referenced by _lwt_RemEdge(), lwcircstring_calculate_gbox_cartesian(), lwcollection_calculate_gbox_cartesian(), lwcollection_calculate_gbox_geodetic(), LWGEOM_collect_garray(), lwpolygon_calculate_gbox_geodetic(), and ptarray_calculate_gbox_geodetic().

{
        assert(merge_box);

        if ( FLAGS_GET_ZM(merge_box->flags) != FLAGS_GET_ZM(new_box->flags) )
                return LW_FAILURE;

        if ( new_box->xmin < merge_box->xmin) merge_box->xmin = new_box->xmin;
        if ( new_box->ymin < merge_box->ymin) merge_box->ymin = new_box->ymin;
        if ( new_box->xmax > merge_box->xmax) merge_box->xmax = new_box->xmax;
        if ( new_box->ymax > merge_box->ymax) merge_box->ymax = new_box->ymax;

        if ( FLAGS_GET_Z(merge_box->flags) || FLAGS_GET_GEODETIC(merge_box->flags) )
        {
                if ( new_box->zmin < merge_box->zmin) merge_box->zmin = new_box->zmin;
                if ( new_box->zmax > merge_box->zmax) merge_box->zmax = new_box->zmax;
        }
        if ( FLAGS_GET_M(merge_box->flags) )
        {
                if ( new_box->mmin < merge_box->mmin) merge_box->mmin = new_box->mmin;
                if ( new_box->mmax > merge_box->mmax) merge_box->mmax = new_box->mmax;
        }

        return LW_SUCCESS;
}

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