geometry_to_path()

Datum geometry_to_path

(

PG_FUNCTION_ARGS

)

Definition at line 107 of file geometry_inout.c.

{
        PATH *path;
        LWLINE *lwline;
        LWGEOM *lwgeom;
        GSERIALIZED *geom;
        POINTARRAY *pa;
        uint32_t i;
        const POINT2D *pt;
        size_t size;
 
        POSTGIS_DEBUG(2, "geometry_to_path called");
 
        if ( PG_ARGISNULL(0) )
                PG_RETURN_NULL();
 
        geom = PG_GETARG_GSERIALIZED_P(0);
 
        if ( gserialized_get_type(geom) != LINETYPE )
                elog(ERROR, "geometry_to_path only accepts LineStrings");
 
        lwgeom = lwgeom_from_gserialized(geom);
        if ( lwgeom_is_empty(lwgeom) )
                PG_RETURN_NULL();
        lwline = lwgeom_as_lwline(lwgeom);
 
        pa = lwline->points;
    size = offsetof(PATH, p[0]) + sizeof(path->p[0]) * pa->npoints;
    path = (PATH*)palloc(size);
        SET_VARSIZE(path, size);
        path->npts = pa->npoints;
        path->closed = 0;
        path->dummy = 0;
 
        for ( i = 0; i < pa->npoints; i++ )
        {
                pt = getPoint2d_cp(pa, i);
                (path->p[i]).x = pt->x;
                (path->p[i]).y = pt->y;
        }
 
        lwgeom_free(lwgeom);
        PG_FREE_IF_COPY(geom,0);
 
        PG_RETURN_PATH_P(path);
}

References getPoint2d_cp(), gserialized_get_type(), LINETYPE, lwgeom_as_lwline(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_empty(), POINTARRAY::npoints, LWLINE::points, POINT2D::x, and POINT2D::y.

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