Package Exports

@turf/transform-scale

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@turf/transform-scale) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

@turf/transform-scale

scale

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.

Parameters

geojson GeoJSON object to be scaled
factor number of scaling, positive or negative values greater than 0
origin [(string | Geometry | Feature<Point> | Array<number>)] Point from which the scaling will occur (string options: sw/se/nw/ne/center/centroid) (optional, default "centroid")
mutate [boolean] allows GeoJSON input to be mutated (significant performance increase if true) (optional, default false)

Examples

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

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

Returns GeoJSON scaled GeoJSON

This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.

Installation

Install this module individually:

$ npm install @turf/transform-scale

Or install the Turf module that includes it as a function:

$ npm install @turf/turf