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

public class FadeScreen : MonoBehaviour
{
    public bool fadeOnStart = true;
    public float fadeDuration = 2;
    public Color fadeColor;
    private Renderer rend;

    // Start is called before the first frame update
    void Start()
    {
        rend = GetComponent<Renderer>();
        if (fadeOnStart)
          FadeIn();
    }


    public void FadeIn()
    {
      Fade(1, 0);

    }



    public void FadeOut()
    {
      Fade(0, 1);

    }



    public void Fade(float alphaIn, float alphaOut)
    {
      StartCoroutine(FadeRoutine(alphaIn,alphaOut));
    }



    public IEnumerator FadeRoutine(float alphaIn, float alphaOut)
    {
      float timer = 0;
      while(timer <= fadeDuration)
      {
        Color newColor = fadeColor;
        newColor.a = Mathf.Lerp(alphaIn,alphaOut,timer / fadeDuration);

        rend.material.SetColor("_Color", newColor);


        timer += Time.deltaTime;
        yield return null;
      }

      Color newColor2 = fadeColor;
      newColor2.a = alphaOut;

      rend.material.SetColor("_Color", newColor2);

    }
}