LWGEOM_addpoint()

Datum LWGEOM_addpoint

(

PG_FUNCTION_ARGS

)

Definition at line 2157 of file lwgeom_functions_basic.c.

References geometry_serialize(), gserialized_get_type(), LINETYPE, LW_FAILURE, lwgeom_as_lwline(), lwgeom_as_lwpoint(), lwgeom_clone_deep(), lwgeom_from_gserialized(), LWGEOM_removepoint(), lwline_add_lwpoint(), lwline_as_lwgeom(), lwline_free(), lwpoint_free(), POINTARRAY::npoints, PG_FUNCTION_INFO_V1(), LWLINE::points, and POINTTYPE.

Referenced by LWGEOM_makepoint3dm().

{
        GSERIALIZED *pglwg1, *pglwg2, *result;
        LWPOINT *point;
        LWLINE *line, *linecopy;
        int where = -1;

        POSTGIS_DEBUGF(2, "%s called.", __func__);

        pglwg1 = PG_GETARG_GSERIALIZED_P(0);
        pglwg2 = PG_GETARG_GSERIALIZED_P(1);

        if ( PG_NARGS() > 2 )
        {
                where = PG_GETARG_INT32(2);
        }

        if ( gserialized_get_type(pglwg1) != LINETYPE )
        {
                elog(ERROR, "First argument must be a LINESTRING");
                PG_RETURN_NULL();
        }

        if ( gserialized_get_type(pglwg2) != POINTTYPE )
        {
                elog(ERROR, "Second argument must be a POINT");
                PG_RETURN_NULL();
        }

        line = lwgeom_as_lwline(lwgeom_from_gserialized(pglwg1));

        if ( where == -1 ) where = line->points->npoints;
        else if ( where < 0 || where > line->points->npoints )
        {
                elog(ERROR, "Invalid offset");
                PG_RETURN_NULL();
        }

        point = lwgeom_as_lwpoint(lwgeom_from_gserialized(pglwg2));
        linecopy = lwgeom_as_lwline(lwgeom_clone_deep(lwline_as_lwgeom(line)));
        lwline_free(line);

        if ( lwline_add_lwpoint(linecopy, point, where) == LW_FAILURE )
        {
                elog(ERROR, "Point insert failed");
                PG_RETURN_NULL();
        }

        result = geometry_serialize(lwline_as_lwgeom(linecopy));

        /* Release memory */
        PG_FREE_IF_COPY(pglwg1, 0);
        PG_FREE_IF_COPY(pglwg2, 1);
        lwpoint_free(point);

        PG_RETURN_POINTER(result);

}

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