ST_AddMeasure()

Datum ST_AddMeasure

(

PG_FUNCTION_ARGS

)

Definition at line 42 of file lwgeom_functions_lrs.c.

{
        GSERIALIZED *gin = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *gout;
        double start_measure = PG_GETARG_FLOAT8(1);
        double end_measure = PG_GETARG_FLOAT8(2);
        LWGEOM *lwin, *lwout;
        int type = gserialized_get_type(gin);
 
        /* Raise an error if input is not a linestring or multilinestring */
        if ( type != LINETYPE && type != MULTILINETYPE )
        {
                lwpgerror("Only LINESTRING and MULTILINESTRING are supported");
                PG_RETURN_NULL();
        }
 
        lwin = lwgeom_from_gserialized(gin);
        if ( type == LINETYPE )
                lwout = (LWGEOM*)lwline_measured_from_lwline((LWLINE*)lwin, start_measure, end_measure);
        else
                lwout = (LWGEOM*)lwmline_measured_from_lwmline((LWMLINE*)lwin, start_measure, end_measure);
 
        lwgeom_free(lwin);
 
        if ( lwout == NULL )
                PG_RETURN_NULL();
 
        gout = geometry_serialize(lwout);
        lwgeom_free(lwout);
 
        PG_RETURN_POINTER(gout);
}

References gserialized_get_type(), LINETYPE, lwgeom_free(), lwgeom_from_gserialized(), lwline_measured_from_lwline(), lwmline_measured_from_lwmline(), and MULTILINETYPE.

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