# mask

Takes any type of polygon and an optional mask and returns a polygon exterior ring with holes.
获取任意类型的多边形和一个可选的遮罩,并返回一个带孔的多边形外部环。

参数

参数 类型 描述
polygon (FeatureCollection|Feature <(Polygon|MultiPolygon)>) GeoJSON Polygon used as interior rings or holes.
mask (Feature <Polygon>) GeoJSON Polygon used as the exterior ring (if undefined, the world extent is used)

返回

Feature <Polygon> - Masked Polygon (exterior ring with holes).

示例

var polygon = turf.polygon([[[112, -21], [116, -36], [146, -39], [153, -24], [133, -10], [112, -21]]]);
var mask = turf.polygon([[[90, -55], [170, -55], [170, 10], [90, 10], [90, -55]]]);

var masked = turf.mask(polygon, mask);
Last Updated: 1/19/2021, 10:59:20 AM