https://github.com/dy/polyline-clean

Clean polygon or polyline coordinates: remove duplicates, degenerate, collinear or bad items, trim.
https://github.com/dy/polyline-clean

Last synced: about 1 year ago
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Clean polygon or polyline coordinates: remove duplicates, degenerate, collinear or bad items, trim.

• Host: GitHub
• URL: https://github.com/dy/polyline-clean
• Owner: dy
• License: mit
• Created: 2018-04-26T02:22:12.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2018-04-27T00:57:31.000Z (about 8 years ago)
• Last Synced: 2025-04-14T23:53:46.121Z (about 1 year ago)
• Language: JavaScript
• Homepage:
• Size: 13.7 KB
• Stars: 2
• Watchers: 2
• Forks: 2
• Open Issues: 1
• Metadata Files:
  • Readme: readme.md
  • License: license.md

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README

          
# polyline-clean [![experimental](https://img.shields.io/badge/stability-unstable-green.svg)](http://github.com/badges/stability-badges) [![Build Status](https://travis-ci.org/dy/polyline-clean.png)](https://travis-ci.org/dy/polyline-clean)

Clean polyline or polygon data: remove duplicate, collinear, null points, etc.

[![npm install polyline-clean](https://nodei.co/npm/polyline-clean.png?mini=true)](https://npmjs.org/package/polyline-clean/)

```js

const c = require('polyline-clean')

// remove duplicate, degenerate or collinear segments

c([[0,0], [null,null], [1,1], [1,1], [.5,.5], [1,1], [3,3]])

// === [[0,0], [3,3]]

```

## `c(coordinates, options?)`

Return new coordinates array with bad points removed. If result is degenerate, `null` will be returned.

Option | Meaning

---|---

`ids` | Return indexes in the initial array instead of points.

`fold` | Collapse collinear segments. Can be a number indicating min angle threshold. `polygon` mode has more rigid folding. Useful to disable it when data has logarithmic fashion.

`polygon` | Apply polygon optimizations: remove coinciding end, collinear end segments, ignore degenerate results.

## Related

* [parse-poly](https://github.com/dy/parse-poly) − parse any polygon/polyline format and return list of coordinates.

* [simplify-path](https://www.npmjs.com/package/simplify-path) − simplify polyline with tolerance.

## License

(c) 2018 Dmitry Yv. MIT License