LWGEOM_segmentize2d()

Datum LWGEOM_segmentize2d

(

PG_FUNCTION_ARGS

)

Definition at line 1808 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *outgeom, *ingeom;
        double dist;
        LWGEOM *inlwgeom, *outlwgeom;
        int type;
 
        POSTGIS_DEBUG(2, "LWGEOM_segmentize2d called");
 
        ingeom = PG_GETARG_GSERIALIZED_P(0);
        dist = PG_GETARG_FLOAT8(1);
        type = gserialized_get_type(ingeom);
 
        /* Avoid types we cannot segmentize. */
        if ((type == POINTTYPE) || (type == MULTIPOINTTYPE) || (type == TRIANGLETYPE) || (type == TINTYPE) ||
            (type == POLYHEDRALSURFACETYPE))
        {
                PG_RETURN_POINTER(ingeom);
        }
 
        if (dist <= 0)
        {
                /* Protect from knowingly infinite loops, see #1799 */
                /* Note that we'll end out of memory anyway for other small distances */
                elog(ERROR, "ST_Segmentize: invalid max_distance %g (must be >= 0)", dist);
                PG_RETURN_NULL();
        }
 
        LWGEOM_INIT();
 
        inlwgeom = lwgeom_from_gserialized(ingeom);
        if (lwgeom_is_empty(inlwgeom))
        {
                /* Should only happen on interruption */
                lwgeom_free(inlwgeom);
                PG_RETURN_POINTER(ingeom);
        }
 
        outlwgeom = lwgeom_segmentize2d(inlwgeom, dist);
        if (!outlwgeom)
        {
                /* Should only happen on interruption */
                PG_FREE_IF_COPY(ingeom, 0);
                PG_RETURN_NULL();
        }
 
        /* Copy input bounding box if any */
        if (inlwgeom->bbox)
                outlwgeom->bbox = gbox_copy(inlwgeom->bbox);
 
        outgeom = geometry_serialize(outlwgeom);
 
        // lwgeom_free(outlwgeom); /* TODO fix lwgeom_clone / ptarray_clone_deep for consistent semantics */
        lwgeom_free(inlwgeom);
 
        PG_FREE_IF_COPY(ingeom, 0);
 
        PG_RETURN_POINTER(outgeom);
}

References LWGEOM::bbox, gbox_copy(), geometry_serialize(), gserialized_get_type(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_empty(), lwgeom_segmentize2d(), MULTIPOINTTYPE, POINTTYPE, POLYHEDRALSURFACETYPE, TINTYPE, TRIANGLETYPE, and ovdump::type.

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