KBE3D / KBCore / turf / transformScale

函数: transformScale()

transformScale<T>(geojson: T, factor: number, options?: { origin?: Coord | Corners; mutate?: boolean; }): T

Function

Scale GeoJSON objects from a given point by a scaling factor e.g. factor=2 would make each object 200% larger. If a FeatureCollection is provided, the origin point will be calculated based on each individual feature unless an exact

类型参数

T

T extends GeometryCollection<Geometry> | GeoJSON

参数

geojson

T

objects to be scaled

factor

number

of scaling, positive values greater than 0. Numbers between 0 and 1 will shrink the geojson, numbers greater than 1 will expand it, a factor of 1 will not change the geojson.

options?

Optional parameters

origin?

Coord | Corners

Point from which the scaling will occur (string options: sw/se/nw/ne/center/centroid)

mutate?

boolean

allows GeoJSON input to be mutated (significant performance improvement if true)

返回

T

scaled GeoJSON

示例

const poly = turf.polygon([[[0,29],[3.5,29],[2.5,32],[0,29]]]);
const scaledPoly = turf.transformScale(poly, 3);

//addToMap
const addToMap = [poly, scaledPoly];
scaledPoly.properties = {stroke: '#F00', 'stroke-width': 4};