ICTS_2021/Unity3/Assets/UI/Loader/FadeOutAccordingToScale.cs

using UnityEngine;
using System.Collections;

/// <summary>
/// This component is used by the loading background sperms. They are fadeout according to the scaling
/// to give the illusion of depth. The fading out is accomplished by darkening the color actually.
/// </summary>
public class FadeOutAccordingToScale : MonoBehaviour
{
	public float minAlpha = 0.1f;
	public float maxAlpha = 0.5f;

	bool _isSetup;
	float _percentageBlack;

	void OnEnable()
	{
		//have to delay setup on update due to pooling
		_isSetup = false;
		NotificationCenter.AddListener(OnFadeOutUpdate, NotificationType.LoadingFadeOutUpdate);
	}

	void OnDisable()
	{
		NotificationCenter.RemoveListener(OnFadeOutUpdate, NotificationType.LoadingFadeOutUpdate);
	}

	void Update()
	{
		if (!_isSetup)
		{
			_percentageBlack = minAlpha + (maxAlpha - minAlpha) * transform.parent.localScale.y;
			SetBlackness(_percentageBlack);
			_isSetup = true;
		}
	}

	void SetBlackness(float p)
	{
		GetComponent<Renderer>().material.SetColor("_TintColor", new Color(p, p, p, 0.5f));
	}

	void OnFadeOutUpdate(Notification note)
	{
		float fadeOutPercentage = (float)note.data;
		SetBlackness(_percentageBlack * fadeOutPercentage);
	}
}