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

public class SimpleTouchPad : MonoBehaviour, IPointerDownHandler, IDragHandler, IPointerUpHandler
{
	public float smoothing;
	private Vector2 origin, direction, smoothDirection;
	private bool touched;
	private int pointerID;
	void Awake()
	{
		direction = Vector2.zero;
		touched = false;
	}
	public void OnPointerDown(PointerEventData data)
	{
		if (!touched)
		{
			touched = true;
			pointerID = data.pointerId;
			origin = data.position;
		}
	}
	public void OnDrag(PointerEventData data)
	{
		if (data.pointerId == pointerID)
		{
			Vector2 currentPosition = data.position;
			Vector2 directionRaw = currentPosition - origin;
			direction = directionRaw.normalized;
		}
	}	
	public void OnPointerUp(PointerEventData data)
	{
		if (data.pointerId == pointerID)
		{
			direction = Vector2.zero;
			touched = false;
		}
	}
	public Vector2 GetDirection()
	{
		smoothDirection = Vector2.MoveTowards(smoothDirection, direction, smoothing);
		return smoothDirection;
	}
}