ST_LocateBetweenElevations()

Datum ST_LocateBetweenElevations

(

PG_FUNCTION_ARGS

)

Definition at line 151 of file lwgeom_functions_lrs.c.

References geometry_serialize(), gserialized_has_z(), lwgeom_clip_to_ordinate_range(), lwgeom_free(), lwgeom_from_gserialized(), PG_FUNCTION_INFO_V1(), and ST_InterpolatePoint().

Referenced by ST_LocateBetween().

{
        GSERIALIZED *geom_in = PG_GETARG_GSERIALIZED_P(0);
        double from = PG_GETARG_FLOAT8(1);
        double to = PG_GETARG_FLOAT8(2);
        LWCOLLECTION *geom_out = NULL;
        LWGEOM *line_in = NULL;
        static char ordinate = 'Z'; /* Z */
        static double offset = 0.0;

        if ( ! gserialized_has_z(geom_in) )
        {
                elog(ERROR,"This function only accepts LINESTRING or MULTILINESTRING with Z dimensions.");
                PG_RETURN_NULL();
        }

        line_in = lwgeom_from_gserialized(geom_in);
        geom_out = lwgeom_clip_to_ordinate_range(line_in,  ordinate, from, to, offset);
        lwgeom_free(line_in);
        PG_FREE_IF_COPY(geom_in, 0);

        if ( ! geom_out )
        {
                elog(ERROR,"lwline_clip_to_ordinate_range returned null");
                PG_RETURN_NULL();
        }

        PG_RETURN_POINTER(geometry_serialize((LWGEOM*)geom_out));
}

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