transformScale

Scale a GeoJSON from a given point by a factor of scaling (ex: factor=2 would make the GeoJSON 200% larger). If a FeatureCollection is provided, the origin point will be calculated based on each individual Feature.
从一个给定的点缩放GeoJSON(例如:factor=2将使GeoJSON增大200%)。如果提供了FeatureCollection，则将根据每个单独的Feature计算原点。

参数

参数	类型	描述
geojson	GeoJSON	GeoJSON to be scaled
factor	number	of scaling, positive or negative values greater than 0
options	Object	可选参数：见下文

options选项

属性	类型	默认值	描述
origin	(string	Coord)	centroid
mutate	boolean | false	允许修改GeoJSON输入（如果为真，性能将显著提高）

返回

GeoJSON - scaled GeoJSON

示例

// 注意：polygon首尾坐标要一致
var poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
var scaledPoly = turf.transformScale(poly, 3);