LWGEOM_addpoint()

Datum LWGEOM_addpoint

(

PG_FUNCTION_ARGS

)

Definition at line 2164 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *pglwg1, *pglwg2, *result;
        LWPOINT *point;
        LWLINE *line, *linecopy;
        uint32_t uwhere = 0;
 
        POSTGIS_DEBUGF(2, "%s called.", __func__);
 
        pglwg1 = PG_GETARG_GSERIALIZED_P(0);
        pglwg2 = PG_GETARG_GSERIALIZED_P(1);
 
        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 (PG_NARGS() <= 2)
        {
                uwhere = line->points->npoints;
        }
        else
        {
                int32 where = PG_GETARG_INT32(2);
                if (where == -1)
                {
                        uwhere = line->points->npoints;
                }
                else if (where < 0 || where > (int32)line->points->npoints)
                {
                        elog(ERROR, "%s: Invalid offset", __func__);
                        PG_RETURN_NULL();
                }
                else
                {
                        uwhere = where;
                }
        }
 
        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, uwhere) == 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);
}

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

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