LWGEOM_snaptogrid()

Datum LWGEOM_snaptogrid

(

PG_FUNCTION_ARGS

)

Definition at line 338 of file lwgeom_functions_analytic.c.

{
        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_refresh_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);
}

References LWGEOM::bbox, gserialized_is_empty(), gridspec_t::ipx, gridspec_t::ipy, lwgeom_from_gserialized(), lwgeom_grid(), lwgeom_refresh_bbox(), lwtype_name(), gridspec_t::msize, LWGEOM::type, gridspec_t::xsize, gridspec_t::ysize, and gridspec_t::zsize.

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