LWGEOM_removepoint()

Datum LWGEOM_removepoint

(

PG_FUNCTION_ARGS

)

Definition at line 2249 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *pglwg1, *result;
        LWLINE *line, *outline;
        int32 which;
 
        POSTGIS_DEBUG(2, "LWGEOM_removepoint called.");
 
        pglwg1 = PG_GETARG_GSERIALIZED_P(0);
        which = PG_GETARG_INT32(1);
 
        if (gserialized_get_type(pglwg1) != LINETYPE)
        {
                elog(ERROR, "First argument must be a LINESTRING");
                PG_RETURN_NULL();
        }
 
        line = lwgeom_as_lwline(lwgeom_from_gserialized(pglwg1));
 
        if (which < 0 || (uint32_t)which > line->points->npoints - 1)
        {
                elog(ERROR, "Point index out of range (%u..%u)", 0, line->points->npoints - 1);
                PG_RETURN_NULL();
        }
 
        if (line->points->npoints < 3)
        {
                elog(ERROR, "Can't remove points from a single segment line");
                PG_RETURN_NULL();
        }
 
        outline = lwline_removepoint(line, (uint32_t)which);
        /* Release memory */
        lwline_free(line);
 
        result = geometry_serialize((LWGEOM *)outline);
        lwline_free(outline);
 
        PG_FREE_IF_COPY(pglwg1, 0);
        PG_RETURN_POINTER(result);
}

References geometry_serialize(), gserialized_get_type(), LINETYPE, lwgeom_as_lwline(), lwgeom_from_gserialized(), lwline_free(), lwline_removepoint(), POINTARRAY::npoints, and LWLINE::points.

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