Character movement via on-screen Joystick controller input | Rigidbody | Unity Game Engine

JoystickController.cs

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

public class JoystickController : MonoBehaviour, IPointerDownHandler, IDragHandler, IPointerUpHandler
{
    [SerializeField]
    private float maxDisplacement = 200;
    Vector2 startPos;
    Transform handle;

    public static float Horizontal = 0, Vertical = 0;

    void Start()
    {
        handle = transform.GetChild(0);
        startPos = handle.position;
    }

    void UpdateHandlePosition(Vector2 pos)
    {
        var delta = pos - startPos;
        delta = Vector2.ClampMagnitude(delta, maxDisplacement);
        handle.position = startPos + delta;
        Horizontal = delta.x / maxDisplacement;
        Vertical = delta.y / maxDisplacement;
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        UpdateHandlePosition(eventData.position);
    }

    public void OnDrag(PointerEventData eventData)
    {
        UpdateHandlePosition(eventData.position);
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        UpdateHandlePosition(startPos);
    }
}

JoystickMove.cs

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

[RequireComponent(typeof(Rigidbody))]
public class JoystickMove : MonoBehaviour
{
    public float speed = 5;
    Rigidbody rigidBody;

    void Awake()
    {
        rigidBody = GetComponent<Rigidbody>();
    }

    void FixedUpdate()
    {
        float inputH = JoystickController.Horizontal;
        float inputV = JoystickController.Vertical;
        rigidBody.velocity = new Vector3(inputH * speed, rigidBody.velocity.y, inputV * speed);
    }
}