https://github.com/juliendargelos/easings
Easing functions in TypeScript.
https://github.com/juliendargelos/easings
animation easing javascript typescript
Last synced: 11 months ago
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Easing functions in TypeScript.
- Host: GitHub
- URL: https://github.com/juliendargelos/easings
- Owner: juliendargelos
- License: mit
- Created: 2020-03-26T10:55:01.000Z (about 6 years ago)
- Default Branch: master
- Last Pushed: 2022-08-30T00:14:29.000Z (almost 4 years ago)
- Last Synced: 2025-05-23T20:17:20.326Z (about 1 year ago)
- Topics: animation, easing, javascript, typescript
- Language: TypeScript
- Homepage: https://julien.gl/easings
- Size: 467 KB
- Stars: 6
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
- License: LICENSE
Awesome Lists containing this project
README
# easings
[](https://github.com/juliendargelos/easings/actions?workflow=test)
[](https://github.com/juliendargelos/easings/actions?workflow=build)
[](https://github.com/juliendargelos/easings)
Easing functions in TypeScript.
[Demo](https://julien.gl/easings) (relies on css paint api so you should use Google Chrome for now).
## Install
```bash
npm install @juliendargelos/easings --save
```
## Usage
#### Basic
[All easing functions](#available-easings) take a number in range `[0..1]` and return the eased number.
```typescript
import { cubic } from '@juliendargelos/easings'
cubic(0.1) // in out
cubic.in(0.2) // in
cubic.out(0.3) // out
```
You can access easing functions by their name which follows the same pattern as above.
```typescript
import { Easings } from '@juliendargelos/easings'
Easings['exponential'](0.1)
Easings['exponential.in'](0.2)
Easings['exponential.out'](0.3)
```
#### Parameterized easings
Parameterized easings have an extra `with()` method that generate a new easing function based on parameters. Other easings **do not** have the `with()` method (would be pointless), see [*Available easings*](#available-easings).
```typescript
import { elastic } from '@juliendargelos/easings'
// Use default parameterss
elastic(0.1)
elastic.in(0.2)
elastic.out(0.3)
// Use custom parameters (creates a new easing function)
const customElastic = elastic.with({ amplitude: 0.8, period: 0.4 })
const customElasticIn = elastic.in.with({ amplitude: 0.8, period: 0.4 })
const customElasticOut = elastic.out.with({ amplitude: 0.8, period: 0.4 })
customElastic(0.1)
customElasticIn(0.2)
customElasticOut(0.3)
```
#### Available easings
| Name | Parameters (default values) |
|--------------------------|---------------------------------|
| `linear` | |
| `quadratic[.in\|.out]` | |
| `cubic[.in\|.out]` | |
| `quartic[.in\|.out]` | |
| `quintic[.in\|.out]` | |
| `circular[.in\|.out]` | |
| `sinusoidal[.in\|.out]` | |
| `bounce[.in\|.out]` | |
| `exponential[.in\|.out]` | `{ order: 10 }` |
| `back[.in\|.out]` | `{ overshoot: 1.70158 }` |
| `elastic[.in\|.out]` | `{ amplitude: 1, period: 0.3 }` |
#### Types
The library exports basic types you might find useful if you want to expose easing options in your own library:
```typescript
import { EasingName, EasingFunction } from '@juliendargelos/easing'
// EasingName represents all string names from the above list ('cubic', 'cubic.in', ...)
// EasingFunction is an alias for (t: number) => number
```