https://github.com/jsmolka/hull

Concave or convex hull around a list of points.
https://github.com/jsmolka/hull

concave convex hull python

Last synced: 7 days ago
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Concave or convex hull around a list of points.

• Host: GitHub
• URL: https://github.com/jsmolka/hull
• Owner: jsmolka
• License: mit
• Created: 2017-07-26T18:23:43.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2024-08-06T06:48:12.000Z (3 months ago)
• Last Synced: 2024-08-07T03:16:29.479Z (3 months ago)
• Topics: concave, convex, hull, python
• Language: Python
• Homepage:
• Size: 1.37 MB
• Stars: 47
• Watchers: 2
• Forks: 19
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
# hull

Concave or convex hull around a list of points.

## How to use

```python

import hull

points = [

    (207, 184), (393, 60), (197, 158), (197, 114), (128, 261), (442, 40),

    (237, 159), (338, 75), (194, 93), (33, 159), (393, 152), (433, 267),

    (324, 141), (384, 183), (273, 165), (250, 257), (423, 198), (227, 68),

    (120, 184), (214, 49), (256, 75), (379, 93), (312, 49), (471, 187),

    (366, 122)

]

concave = hull.concave(points)

convex = hull.convex(points)

```

The code above creates the following results:



## Requirements

- [pyprocessing](https://github.com/jsmolka/pyprocessing) if you want to run the visual examples

## References

- The concave hull algorithm is based on a [paper](https://github.com/jsmolka/hull/blob/master/reference/concave_hull.pdf) by Adriano Moreira and Maribel Yasmina Santos.

- The convex hull algorithm is an implementation of Andrew's monotone chain algorithm.

## Disclaimer

- Some parts of the concave hull algorithm were copied from [Mapotempo's](https://github.com/Mapotempo/mapotempo-web/blob/master/lib/concave_hull.rb) Ruby approach.

- The entire convex hull algorithm is copy-pasted from a [wikibook](https://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain) about algorithm implementations.