Package Exports
- @mapbox/polyline
- @mapbox/polyline/src/polyline.js
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 (@mapbox/polyline) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
polyline
A simple google-esque polyline
implementation in Javascript. Compatible with nodejs (npm install @mapbox/polyline and the browser (copy src/polyline.js)).
Encodes from / decodes into [lat, lng] coordinate pairs. Use fromGeoJSON() to encode from GeoJSON objects, or toGeoJSON to
decode to a GeoJSON LineString.
Installation
npm install @mapbox/polylineNote that the old package polyline has been deprecated in favor of @mapbox/polyline (the old package remain but won't receive updates).
Example
var polyline = require('@mapbox/polyline');
// returns an array of lat, lon pairs
polyline.decode('_p~iF~ps|U_ulLnnqC_mqNvxq`@');
// returns an array of lat, lon pairs from polyline6 by passing a precision parameter
polyline.decode('cxl_cBqwvnS|Dy@ogFyxmAf`IsnA|CjFzCsHluD_k@hi@ljL', 6);
// returns a GeoJSON LineString Geometry
polyline.toGeoJSON('_p~iF~ps|U_ulLnnqC_mqNvxq`@');
// returns a string-encoded polyline (from coordinate ordered lat,lng)
polyline.encode([[38.5, -120.2], [40.7, -120.95], [43.252, -126.453]]);
// returns a string-encoded polyline from a GeoJSON LineString
polyline.fromGeoJSON({ "type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": [[-120.2, 38.5], [-120.95, 40.7], [-126.453, 43.252]]
},
"properties": {}
});
Command line
Install globally or run ./node_modules/.bin/polyline.
Send input via stdin and use --decode, --encode, --toGeoJSON, or --fromGeoJSON flags. If omitted will default to --decode.
Example :
cat file.json | ./bin/polyline.bin.js --fromGeoJSON > result.txt