difference

Finds the difference between two polygons by clipping the second polygon from the first.
通过从第一个多边形剪裁第二个多边形来查找两个多边形之间的差异。

参数

参数	类型	描述
polygon1	Feature <(Polygon|MultiPolygon)>	input Polygon feature
polygon2	Feature <(Polygon|MultiPolygon)>	Polygon feature to difference from polygon1

返回

(Feature <(Polygon|MultiPolygon)>|null) - a Polygon or MultiPolygon feature showing the area of polygon1 excluding the area of polygon2 (if empty returns null )

示例

var polygon1 = turf.polygon([[
  [128, -26],
  [141, -26],
  [141, -21],
  [128, -21],
  [128, -26]
]], {
  "fill": "#F00",
  "fill-opacity": 0.1
});
var polygon2 = turf.polygon([[
  [126, -28],
  [140, -28],
  [140, -20],
  [126, -20],
  [126, -28]
]], {
  "fill": "#00F",
  "fill-opacity": 0.1
});

var difference = turf.difference(polygon1, polygon2);