using UnityEngine;

[ExecuteInEditMode]
public class FadeUGUI : MonoBehaviour
{
	public float invisibleDistance = 100f;

	public float fadeDistance = 70f;

	public Transform target;

	private EnergyBarBase energyBarBase;

	private void OnEnable()
	{
		energyBarBase = GetComponent<EnergyBarBase>();
	}

	private void Update()
	{
		if (!(target == null))
		{
			float magnitude = (Camera.main.transform.position - target.position).magnitude;
			if (magnitude < fadeDistance)
			{
				SetAlpha(1f);
			}
			else if (magnitude > invisibleDistance)
			{
				SetAlpha(0f);
			}
			else
			{
				SetAlpha((magnitude - fadeDistance) / (invisibleDistance - fadeDistance));
			}
		}
	}

	private void SetAlpha(float alpha)
	{
		energyBarBase.tint = new Color(1f, 1f, 1f, alpha);
	}
}