LWGEOM_snaptogrid()

Datum LWGEOM_snaptogrid

(

PG_FUNCTION_ARGS

)

Definition at line 319 of file lwgeom_functions_analytic.c.

References LWGEOM::bbox, geometry_serialize(), gserialized_is_empty(), gridspec_t::ipm, gridspec_t::ipx, gridspec_t::ipy, gridspec_t::ipz, lwgeom_add_bbox(), lwgeom_drop_bbox(), lwgeom_from_gserialized(), lwgeom_grid(), LWGEOM_snaptogrid_pointoff(), lwtype_name(), gridspec_t::msize, PG_FUNCTION_INFO_V1(), LWGEOM::type, gridspec_t::xsize, gridspec_t::ysize, and gridspec_t::zsize.

{
        LWGEOM *in_lwgeom;
        GSERIALIZED *out_geom = NULL;
        LWGEOM *out_lwgeom;
        gridspec grid;

        GSERIALIZED *in_geom = PG_GETARG_GSERIALIZED_P(0);

        /* Set grid values to zero to start */
        memset(&grid, 0, sizeof(gridspec));

        grid.ipx = PG_GETARG_FLOAT8(1);
        grid.ipy = PG_GETARG_FLOAT8(2);
        grid.xsize = PG_GETARG_FLOAT8(3);
        grid.ysize = PG_GETARG_FLOAT8(4);

        /* Return input geometry if input geometry is empty */
        if ( gserialized_is_empty(in_geom) )
        {
                PG_RETURN_POINTER(in_geom);
        }

        /* Return input geometry if input grid is meaningless */
        if ( grid.xsize==0 && grid.ysize==0 && grid.zsize==0 && grid.msize==0 )
        {
                PG_RETURN_POINTER(in_geom);
        }

        in_lwgeom = lwgeom_from_gserialized(in_geom);

        POSTGIS_DEBUGF(3, "SnapToGrid got a %s", lwtype_name(in_lwgeom->type));

        out_lwgeom = lwgeom_grid(in_lwgeom, &grid);
        if ( out_lwgeom == NULL ) PG_RETURN_NULL();

        /* COMPUTE_BBOX TAINTING */
        if ( in_lwgeom->bbox )
        {
                lwgeom_drop_bbox(out_lwgeom);
                lwgeom_add_bbox(out_lwgeom);
        }

        POSTGIS_DEBUGF(3, "SnapToGrid made a %s", lwtype_name(out_lwgeom->type));

        out_geom = geometry_serialize(out_lwgeom);

        PG_RETURN_POINTER(out_geom);
}

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