LWGEOM_startpoint_linestring()

Datum LWGEOM_startpoint_linestring

(

PG_FUNCTION_ARGS

)

Definition at line 682 of file lwgeom_ogc.c.

{
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        LWGEOM *lwgeom = lwgeom_from_gserialized(geom);
        LWPOINT *lwpoint = NULL;
        int type = lwgeom->type;
 
        if ( type == LINETYPE || type == CIRCSTRINGTYPE )
        {
                lwpoint = lwline_get_lwpoint((LWLINE*)lwgeom, 0);
        }
        else if ( type == COMPOUNDTYPE )
        {
                lwpoint = lwcompound_get_startpoint((LWCOMPOUND*)lwgeom);
        }
 
        lwgeom_free(lwgeom);
        PG_FREE_IF_COPY(geom, 0);
 
        if ( ! lwpoint )
                PG_RETURN_NULL();
 
        PG_RETURN_POINTER(geometry_serialize(lwpoint_as_lwgeom(lwpoint)));
}

References CIRCSTRINGTYPE, COMPOUNDTYPE, geometry_serialize(), LINETYPE, lwcompound_get_startpoint(), lwgeom_free(), lwgeom_from_gserialized(), lwline_get_lwpoint(), lwpoint_as_lwgeom(), and LWGEOM::type.

Here is the call graph for this function: