Simple Unity Springs

Simple and free spring library for Unity, perfect for animating UI or game elements in your project, heavily inspired by https://www.react-spring.dev/.

Installation

Open your Unity package Manager, press "Add package from git url" and enter the following URL:

https://github.com/mashlol/SimpleUnitySprings.git

Usage

Basic usage

The Spring class lets you animate a single float value.

Movie_007.webm

using SimpleUnitySprings;
using UnityEngine;

public class MyBehaviour : MonoBehaviour {

    private Spring spring;

    private void Start() {
        spring = new(
            config: SpringConfig.Create(tension: 600, friction: 3),
            from: 1,
            to: 2f);
    }

    private void Update() {
        spring.Tick(Time.deltaTime);

        transform.localScale = Vector3.one * spring.Get();
    }
}

The Vector3Spring class lets you animate a Vector3 value.

Movie_006.webm

using SimpleUnitySprings;
using UnityEngine;

public class MyBehaviour : MonoBehaviour {

    private Vector3Spring spring;

    private void Start() {
        spring = new(
            config: SpringConfig.Create(tension: 600, friction: 30),
            from: new Vector3(-6.5f, -2.2f, -2f),
            to: new Vector3(6.5f, 4f, -2f));
    }

    private void Update() {
        spring.Tick(Time.deltaTime);

        transform.position = spring.Get();
    }
}

Chaining

You can pass any Spring into ChainableSpring to support chaining, so each invocation of .To will queue until the previous has completed.

Movie_004.webm

using SimpleUnitySprings;
using UnityEngine;

public class MySpringChainingBehaviour : MonoBehaviour {

    // Initialize a new Vector3 spring starting at position 0,0,0 and moving to 1,1,1
    private ChainableSpring<Vector3> spring;

    private void Start() {
        spring = new(new Vector3Spring(
            config: SpringConfig.Create(tension: 600, friction: 30),
            from: new Vector3(-6.5f, -2.2f, -2f),
            to: new Vector3(6.5f, 4f, -2f)));

        // One at a time the spring will transition to each destination
        spring
            .To(new Vector3(-9, 5, 0))
            .To(new Vector3(4, -1, -4.6f))
            .To(new Vector3(0, 2f, -6.7f))
            .To(Vector3.zero);
    }

    private void Update() {
        spring.Tick(Time.deltaTime);

        transform.position = spring.Get();
    }
}

Spring Configs

A spring config tells the spring how to behave, and can either be created at runtime with SpringConfig.Create() or as a ScriptableObject in your project via Create -> Data -> SpringConfig.

It's recommended to use a ScriptableObject in your scene to share spring configs with multiple springs, as well as to be able to easily edit the configs at runtime to tweak values.