GGJ_2022/Assets/Scripts/UI/HowToPlayController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
using TMPro;

public class HowToPlayController : MonoBehaviour
{
    [SerializeField]
    private MaskableGraphic[] graphics;

    [SerializeField]
    private float fadeTime = 1.0f;
    [SerializeField]
    private float showTime = 3;

    [SerializeField]
    private string NextLevel = "Level 1";

    IEnumerator  Start()
    {


        float elapsedTime = 0;
        Color color;
        while (elapsedTime < fadeTime)
        {
            foreach(MaskableGraphic g in graphics)
            {
                color = g.color;
                color.a = elapsedTime / fadeTime;
                g.color = color;

                yield return new WaitForEndOfFrame();
                elapsedTime += Time.deltaTime;
            }
        }

        foreach (MaskableGraphic g in graphics)
        {
            color = g.color;
            color.a = 1;
            g.color = color;
        }

        yield return new WaitForSeconds(showTime);

        elapsedTime = 0;
        while (elapsedTime < fadeTime)
        {
            foreach (MaskableGraphic g in graphics)
            {
                color = g.color;
                color.a = 1 - elapsedTime / fadeTime;
                g.color = color;

                yield return new WaitForEndOfFrame();
                elapsedTime += Time.deltaTime;
            }
        }

        foreach (MaskableGraphic g in graphics)
        {
            color = g.color;
            color.a = 0;
            g.color = color;
        }

        SceneManager.LoadScene(NextLevel);
    }





}