Namn
CG_ForceLHR — Tvinga fram LHR-orientering
Synopsis
geometry CG_ForceLHR(geometry geom);
Beskrivning
Returns an equivalent geometry whose polygonal components follow the left-hand rule: exterior rings are counter-clockwise and interior rings are clockwise. Rings are reversed as needed; coordinates and dimensionality are preserved. The input must be valid.
Tillgänglighet: 3.5.0
Denna metod behöver SFCGAL-backend.
Denna funktion stöder 3d och kommer inte att tappa z-index.
Denna funktion stöder polyedriska ytor.
Denna funktion stöder trianglar och triangulerade oregelbundna nätverksytor (TIN).
Exempel
Reorient a polygon and its hole to the left-hand rule.
Code
WITH data AS (
SELECT 'POLYGON((0 0,0 4,4 4,4 0,0 0),
(1 1,3 1,3 3,1 3,1 1))'::geometry AS geom
)
SELECT geom AS input_polygon,
CG_ForceLHR(geom) AS lhr_polygon,
ST_IsPolygonCCW(geom) AS input_is_lhr,
ST_IsPolygonCCW(CG_ForceLHR(geom)) AS output_is_lhr
FROM data;
Rasterutdata
POLYGON((0 0,0 4,4 4,4 0,0 0),(1 1,3 1,3 3,1 3,1 1)) | POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1,1 3,3 3,3 1,1 1)) | f | t
Figure