geometry_to_point()

Datum geometry_to_point

(

PG_FUNCTION_ARGS

)

Definition at line 72 of file geometry_inout.c.

{
        Point *point;
        LWGEOM *lwgeom;
        LWPOINT *lwpoint;
        GSERIALIZED *geom;
 
        POSTGIS_DEBUG(2, "geometry_to_point called");
 
        if ( PG_ARGISNULL(0) )
                PG_RETURN_NULL();
 
        geom = PG_GETARG_GSERIALIZED_P(0);
 
        if ( gserialized_get_type(geom) != POINTTYPE )
                elog(ERROR, "geometry_to_point only accepts Points");
 
        lwgeom = lwgeom_from_gserialized(geom);
 
        if ( lwgeom_is_empty(lwgeom) )
                PG_RETURN_NULL();
 
        lwpoint = lwgeom_as_lwpoint(lwgeom);
 
        point = (Point*)palloc(sizeof(Point));
        point->x = lwpoint_get_x(lwpoint);
        point->y = lwpoint_get_y(lwpoint);
 
        lwpoint_free(lwpoint);
        PG_FREE_IF_COPY(geom,0);
 
        PG_RETURN_POINT_P(point);
}

References gserialized_get_type(), lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwgeom_is_empty(), lwpoint_free(), lwpoint_get_x(), lwpoint_get_y(), POINTTYPE, struct_point::x, and struct_point::y.

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