https://github.com/andrestubbe/fasttween

Ultra-fast native Java tweening engine — Mathematical value interpolation with zero overhead. Pure Java, no JNI, 8 essential easing functions.
https://github.com/andrestubbe/fasttween

animation animation-library easing fastjava interpolation java jitpack lerp maven tween tweening zero-dependencies

Last synced: 9 days ago
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Ultra-fast native Java tweening engine — Mathematical value interpolation with zero overhead. Pure Java, no JNI, 8 essential easing functions.

• Host: GitHub
• URL: https://github.com/andrestubbe/fasttween
• Owner: andrestubbe
• License: mit
• Created: 2026-04-17T14:28:09.000Z (9 days ago)
• Default Branch: main
• Last Pushed: 2026-04-17T15:01:55.000Z (9 days ago)
• Last Synced: 2026-04-17T16:37:11.059Z (9 days ago)
• Topics: animation, animation-library, easing, fastjava, interpolation, java, jitpack, lerp, maven, tween, tweening, zero-dependencies
• Language: Java
• Homepage:
• Size: 10.7 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# FastTween

> **Ultra-fast native Java tweening engine** — Mathematical value interpolation with zero overhead

[![Java](https://img.shields.io/badge/Java-17+-blue.svg)](https://www.java.com)

[![Maven](https://img.shields.io/badge/Maven-3.9+-orange.svg)](https://maven.apache.org)

[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

[![JitPack](https://img.shields.io/badge/JitPack-ready-green.svg)](https://jitpack.io)

---

## Quick Start

```java

// Basic tween from 0 to 100 over 300ms

FastTween tween = FastTween.to(0f, 100f, 300)

    .ease(Ease.CUBIC_OUT)

    .onUpdate(value -> System.out.println(value))

    .start();

// Custom easing via lambda

FastTween.to(0f, 1f, 500)

    .ease(t -> t * t * (3 - 2 * t))  // smoothstep

    .start();

```

---

## Installation

### JitPack

```xml

    

        jitpack.io

        https://jitpack.io

    

    com.github.andrestubbe

    fasttween

    v1.0.0

```

### Gradle (via JitPack)

```groovy

repositories {

    maven { url 'https://jitpack.io' }

}

dependencies {

    implementation 'com.github.andrestubbe:fasttween:v1.0.0'

}

```

---

## Features

- **8 Essential Easing Functions** — Linear, Quad, Cubic, Quart, Back, Elastic, Bounce, Expo

- **Custom Easing Support** — Lambda-based `EaseFunction` interface

- **Type Flexibility** — float, double, int interpolation

- **Zero Dependencies** — Pure Java, no JNI needed

- **Zero Allocation** — Reusable tween instances

---

## Project Structure

```

fasttween/

├── src/main/java/fasttween/

│   ├── FastTween.java      # Static factory

│   ├── Ease.java           # Built-in easing enum

│   ├── EaseFunction.java   # Functional interface

│   ├── Tween.java          # Tween instance

│   └── Interpolation.java  # Math utilities

├── examples/00-basic-usage/

└── pom.xml

```

---

## License

MIT License — See [LICENSE](LICENSE) for details.

**Part of the FastJava Ecosystem** — *Making the JVM faster.*