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https://github.com/lume/kiwi
Fast TypeScript implementation of the Cassowary constraint solving algorithm (soon for AssemblyScript / WebAssembly).
https://github.com/lume/kiwi
assemblyscript autolayout autolayout-constraints cassowary constraint-layout constraint-programming constraint-solver constraints javascript kiwi typescript webassembly
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Fast TypeScript implementation of the Cassowary constraint solving algorithm (soon for AssemblyScript / WebAssembly).
- Host: GitHub
- URL: https://github.com/lume/kiwi
- Owner: lume
- License: other
- Created: 2021-05-23T03:38:20.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-01-25T08:02:07.000Z (11 months ago)
- Last Synced: 2024-05-23T06:35:26.622Z (7 months ago)
- Topics: assemblyscript, autolayout, autolayout-constraints, cassowary, constraint-layout, constraint-programming, constraint-solver, constraints, javascript, kiwi, typescript, webassembly
- Language: TypeScript
- Homepage: https://codepen.io/trusktr/pen/abMLVxa
- Size: 535 KB
- Stars: 131
- Watchers: 9
- Forks: 8
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: COPYING.txt
Awesome Lists containing this project
README
# LUME Kiwi
LUME Kiwi is a fast TypeScript implementation of the [Cassowary constraint
solving algorithm](), based on the seminal Cassowary paper. Originally created by
Chris Colbert, it was redesigned from the ground up to be lightweight, fast and
easy to maintain. View the [benchmarks](#benchmarks) to see how it compares to
[Cassowary.js](https://github.com/slightlyoff/cassowary.js).
Soon it will be compiled to
[WebAssembly](https://developer.mozilla.org/en-US/docs/WebAssembly) with
[AssemblyScript](http://assemblyscript.org) (TypeScript to WebAssembly
compiler).
## Index
- [Demo](#demo)
- [Install](#install)
- [Usage](#usage)
- [Documentation](#documentation)
- [Benchmarks](#benchmarks)
- [Tests](#tests)
## Demo
[Live demo on CodePen.](https://codepen.io/trusktr/pen/abMLVxa?editors=1010)
## Install
### Local Install
Install using NPM:
```sh
npm install @lume/kiwi
```
If you have a plain web app with no build, or a non-browser JS runtime that also
supports import maps like Deno, you'll need to add `@lume/kiwi` to your
`importmap` script so that the browser or JS runtime knows where to import kiwi from. F.e.
something like this:
```html
{
"imports": {
"@lume/kiwi": "./node_modules/@lume/kiwi/dist/kiwi.js"
}
}
```
### CDN Install
Note, if using importmaps and native ES Modules in a browser, or in a JS runtime like Deno, you can get Kiwi directly from the UNPKG CDN without installing it locally (just as the [live CodePen demo](#demo) does):
```html
{
"imports": {
"@lume/kiwi": "https://unpkg.com/@lume/[email protected]/dist/kiwi.js"
}
}
```
## Usage
After installing, import kiwi into your project:
```js
import * as kiwi from '@lume/kiwi'
console.log(kiwi)
// ...use kiwi...
```
The following example creates a solver which automatically calculates a width based on some constraints:
```js
// Create a solver
var solver = new kiwi.Solver()
// Create edit variables
var left = new kiwi.Variable()
var width = new kiwi.Variable()
solver.addEditVariable(left, kiwi.Strength.strong)
solver.addEditVariable(width, kiwi.Strength.strong)
solver.suggestValue(left, 100)
solver.suggestValue(width, 400)
// Create and add a constraint
var right = new kiwi.Variable()
solver.addConstraint(new kiwi.Constraint(new kiwi.Expression([-1, right], left, width), kiwi.Operator.Eq))
// Solve the constraints
solver.updateVariables()
console.assert(right.value() === 500)
// later, update the constraints and re-calculate
setTimeout(() => {
solver.suggestValue(left, 200)
solver.suggestValue(width, 600)
solver.updateVariables() // update
console.assert(right.value() === 800)
}, 2000)
```
## Documentation
- [API Reference](docs/Kiwi.md)
## Benchmarks
To run the benchmark in the browser, [just visit this page](https://raw.githack.com/lume/kiwi/main/bench/index.html).
To run the benchmark locally using nodejs, _clone or download this repository_ and execute the following steps:
npm install
npm run bench
Statically serve the project, f.e. `npx five-server .` which opens a new browser
tab, then visit `/bench/index.html` to verify that the benchmark also runs in a
browser.
Sample result output:
```
----- Running creation benchmark...
Cassowary.js x 2,597 ops/sec ±1.56% (93 runs sampled)
kiwi x 26,243 ops/sec ±1.34% (91 runs sampled)
kiwi new API x 20,840 ops/sec ±7.19% (80 runs sampled)
Fastest is kiwi (± 10.11x faster)
----- Running solving benchmark...
Cassowary.js x 260,002 ops/sec ±2.62% (89 runs sampled)
kiwi x 595,455 ops/sec ±1.74% (89 runs sampled)
Fastest is kiwi (± 2.29x faster)
```
## Tests
To run the tests in the browser, [just visit this page](https://raw.githack.com/lume/kiwi/main/test/index.html).
To run the tests locally using nodejs, _clone or download this repository_ and execute the following steps:
npm install
npm run build && npm run test
Start a static server, f.e. `npx five-server .` which opens a new browser tab,
and visit `/test/index.html` to verify that tests also pass in a browser.
## Contribute
If you like this project and want to support it, show some love and give it a
star, try it and report any bugs, write new feature ideas, or even
open a pull request!
## License
© 2013 Nucleic Development Team
© 2021 Joseph Orbegoso Pea (http://github.com/trusktr)
© 2021 Lume
[]()
## Status
[](https://github.com/lume/kiwi/actions/workflows/tests.yml)