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Change Log

All notable changes to this project will be documented in this file. This project adheres to Semantic Versioning.

Unreleased

1.0.0 - 2026-04-12

Breaking change

  • arc.js is now a pure ESM package (from @jgravois).

If you need to require() arc.js as CJS (CommonJS), or have a runtime older than Node.js 18, please use 0.1.4.

0.x syntax:

const arc = require('arc');
const gc = new arc.GreatCircle(/* */);

1.x syntax:

import { GreatCircle } from 'arc';
const gc = new GreatCircle(/* */);

Fixed

  • Antimeridian splitting in GreatCircle.Arc (from @thomas-hervey)

Changed

  • GreatCircle.Arc() now defaults to npoints = 100 — calling gc.Arc() with no arguments produces a smooth 100-point arc instead of a 2-point stub
  • Antimeridian splitting now uses analytical bisection (binary search on interpolate()) instead of the GDAL-ported linear heuristic. This approach is more accurate, especially at high latitudes and low npoints values
  • ArcOptions.offset is now a no-op (kept for backwards compatibility); antimeridian handling is fully automatic

Removed

  • GDAL license file (GDAL-LICENSE.md). No GDAL-derived code remains in the codebase

Added

  • scripts/benchmark.mjs benchmarks bisection vs. prior linear approach across npoints and route types
  • scripts/dump-fixtures.mjs exports all test routes as GeoJSON for use in visual verification (such as https://geojson.io or the index.html demo page)

0.2.0 - 2025-09-22

Breaking

  • Node.js 16 is now the minimum supported runtime

Changed

  • TypeScript support with backwards compatibility (From @thomas-hervey)

0.1.4 - 2022-11-16

Changed

  • Limit output precision to six decimal places

0.1.3 - 2022-05-09

Fixed

  • Fix bug when generating string for Antipodal error

0.1.2 - 2021-10-13

Fixed

  • Fix link to algorithm used in documentation (#40)

0.1.1 - 2018-06-20

Added

  • Support browserify (#26)

0.1.0 - 2014-02-11

Changed

  • Changed GreatCircle constructor to expect objects like {x:-122,y:48} for start/end rather than arc.Coord objects

Added

  • Added mocha tests

Fixed

  • Fixed jshint strict errors
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