using System.Collections;
using UnityEngine;

[RequireComponent(typeof(CanvasGroup))]
public class TeleportScreenFader : MonoBehaviour
{
    private CanvasGroup _cg;

    private void Awake()
    {
        _cg = GetComponent<CanvasGroup>();
    }

    public IEnumerator FadeTo(float targetAlpha, float duration)
    {
        float start = _cg.alpha;
        float t = 0f;
        _cg.blocksRaycasts = targetAlpha > 0.01f;

        while (t < duration)
        {
            t += Time.unscaledDeltaTime;
            _cg.alpha = Mathf.Lerp(start, targetAlpha, t / duration);
            yield return null;
        }
        _cg.alpha = targetAlpha;
        _cg.blocksRaycasts = targetAlpha > 0.01f;
    }
}