!@thi.ng/geom-resample

!npm downloads

> [!NOTE]
> This is one of 214 standalone projects, maintained as part
> of the @thi.ng/umbrella monorepo
> and anti-framework.
>
> 🚀 Please help me to work full-time on these projects by sponsoring me on
> GitHub. Thank you! ❤️

- About
- Status
- Installation
- Dependencies
- Usage examples
- API
- Authors
- License

About

Customizable nD polyline interpolation, re-sampling, splitting & nearest point computation. This is a support package for @thi.ng/geom.

Also includes an implementation of Douglas-Peucker polyline / polygon
simplification.

Current implementations partially based on
toxiclibs (Java) and Clojure version of
thi.ng/geom.

Status

STABLE - used in production

Search or submit any issues for this package

Installation

``bash
yarn add @thi.ng/geom-resample
`

ESM import:

`ts
import * as sample from "@thi.ng/geom-resample";
`

Browser ESM import:

`html

`

JSDelivr documentation

For Node.js REPL:

`js
const sample = await import("@thi.ng/geom-resample");
`

Package sizes (brotli'd, pre-treeshake): ESM: 1.49 KB

Dependencies

- @thi.ng/api
- @thi.ng/checks
- @thi.ng/geom-closest-point
- @thi.ng/geom-isec
- @thi.ng/math
- @thi.ng/vectors

Note: @thi.ng/api is in _most_ cases a type-only import (not used at runtime)

Usage examples

Two projects in this repo's
/examples
directory are using this package:

| Screenshot | Description | Live demo | Source |
|:------------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------|:-------------------------------------------------------|:------------------------------------------------------------------------------------|
| | Animated, iterative polygon subdivisions & visualization | Demo | Source |
| | Animated Voronoi diagram, cubic splines & SVG download | Demo | Source |

API

Generated API docs

`ts
import { resample, simplify } from "@thi.ng/geom-resample";

// resample polygon w/ uniform distance
const pts = resample([[0,0], [100,0], [100,100], [0,100]], { dist: 25 }, true)

// [ [ 0, 0 ], [ 25, 0 ], [ 50, 0 ], [ 75, 0 ],
// [ 100, 0 ], [ 100, 25 ], [ 100, 50 ], [ 100, 75 ],
// [ 100, 100 ], [ 75, 100 ], [ 50, 100 ], [ 25, 100 ],
// [ 0, 100 ], [ 0, 75 ], [ 0, 50 ], [ 0, 25 ] ]

// simply polygon
// (epsilon = 0 only removes co-linear points, increase if necessary)
simplify(pts, 0, true)

// [ [ 0, 0 ], [ 100, 0 ], [ 100, 100 ], [ 0, 100 ] ]
`

Authors

- Karsten Schmidt

If this project contributes to an academic publication, please cite it as:

`bibtex
@misc{thing-geom-resample,
title = "@thi.ng/geom-resample",
author = "Karsten Schmidt",
note = "https://thi.ng/geom-resample",
year = 2013
}
``

License

© 2013 - 2026 Karsten Schmidt // Apache License 2.0