Unity - simple 2D auto rotation component with nice Gizmo, separated from Unity Playground, added a rotation type, follows Open/Closed principle

AutoRotator2D.cs

using UnityEngine;

[RequireComponent(typeof(Rigidbody2D))]
public class AutoRotator2D : MonoBehaviour
{
    public enum AutoRotateType
    {
        AddForceEveryFrame,
        AddTorqueImpulse
    }

    public bool AutoStart = true;

    public AutoRotateType rotationType = AutoRotateType.AddForceEveryFrame;

    // This is the force that rotate the object every frame
    public float rotationForce = 10f;

    public Mesh gizmoRotateArrowMesh; // use this: https://github.com/Unity-Technologies/UnityPlayground/blob/master/Assets/_INTERNAL_/Resources/Meshes/RotateArrow.fbx

    protected new Rigidbody2D rigidbody2D;
    protected bool hasStarted = false;

    protected virtual void Awake()
    {
        rigidbody2D = GetComponent<Rigidbody2D>();
    }

    protected virtual void Start()
    {
        if (AutoStart && rotationType == AutoRotateType.AddTorqueImpulse)
        {
            AddTorqueImpulse();
        }
    }

    [ContextMenu("Begin Rotation")]
    public virtual void BeginRotation()
    {
        AutoStart = false;
        hasStarted = true;
        if (rotationType == AutoRotateType.AddTorqueImpulse)
        {
            AddTorqueImpulse();
        }
    }

    protected virtual void AddTorqueImpulse()
    {
        rigidbody2D.AddTorque(rotationForce);
        hasStarted = true;
    }

    protected float currentRotation;

    // FixedUpdate is called once per frame
    protected virtual void FixedUpdate()
    {
        if (AutoStart && rotationType == AutoRotateType.AddForceEveryFrame)
        {
            RotateTick();
            hasStarted = true;
        }
        else if (!AutoStart && hasStarted && rotationType == AutoRotateType.AddForceEveryFrame)
        {
            RotateTick();
        }
    }

    protected virtual void RotateTick()
    {
        // Find the right rotation, according to speed
        currentRotation += .02f * rotationForce * 10f;

        // Apply the rotation to the Rigidbody2d
        rigidbody2D.MoveRotation(-currentRotation);
    }

    //Draw an arrow to show the direction in which the object will rotate
    protected virtual void OnDrawGizmosSelected()
    {
        if (enabled)
        {
            DrawRotateArrowGizmo(transform.position, rotationForce);
        }
    }

    protected virtual void DrawRotateArrowGizmo(Vector3 position, float strength)
    {
        Gizmos.color = Color.green;
        Gizmos.DrawMesh(gizmoRotateArrowMesh, position, Quaternion.identity, new Vector3(Mathf.Sign(strength), 1f, Mathf.Sign(strength)));
    }
}