Spinner.cs

//Steffen Vetne made this
//Creative Commons 0

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[ExecuteInEditMode]
public class Spinner : MonoBehaviour
{
    //Fields
    public bool unscaledTime = false;
    public bool worldSpace = false;
    [Space(10)]
    public Vector3 startRotation = Vector3.zero;
    [Space(10)]
    public Vector3 axis = Vector3.up;
    [Space(10)]
    public float rateMultiplier = 100;
    public Vector2 randomRate = new Vector2(1, 2);
    [Space(10)]
    public Vector2 randomStartOffset = new Vector2(0, 0);

    private float rate;
    private Quaternion rotation;



    //Lifecycle
#if UNITY_EDITOR
    private void OnValidate()
    {
        OnEnable();
    }

    private void OnDrawGizmosSelected()
    {
        float size = UnityEditor.HandleUtility.GetHandleSize(transform.position) * 0.75f;

        Vector3 axis = this.axis;
        if (transform.parent != null && !worldSpace)
            axis = transform.parent.TransformDirection(axis); //Because it uses localRotation

        Gizmos.DrawRay(transform.position, axis * size);
    }
#endif

    private void OnEnable()
    {
        rate = Random.Range(randomRate.x, randomRate.y);

        float offset = Random.Range(randomStartOffset.x, randomStartOffset.y);
        rotation = Quaternion.AngleAxis(rateMultiplier * rate * offset, axis) * Quaternion.Euler(startRotation);
    }

    private void Update()
    {
        float dt = unscaledTime ? Time.unscaledDeltaTime : Time.deltaTime;
        rotation = Quaternion.AngleAxis(rateMultiplier * rate * dt, axis) * rotation;

        if(worldSpace)
            transform.rotation = rotation;
        else
            transform.localRotation = rotation;
    }
}