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using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ImageFade : MonoBehaviour
{
    public float FadeRate;
    private Image image;
    private float targetAlpha;

    void Start()
    {
        this.image = this.GetComponent<Image>();
        if (this.image == null)
        {
            Debug.LogError("Error: No image on " + this.name);
        }
        this.targetAlpha = this.image.color.a;

        FadeIn();
    }

    void Update()
    {
        Color curColor = this.image.color;
        float alphaDiff = Mathf.Abs(curColor.a - this.targetAlpha);
        if (alphaDiff > 0.0001f)
        {
            curColor.a = Mathf.Lerp(curColor.a, targetAlpha, this.FadeRate * Time.deltaTime);
            this.image.color = curColor;
        }
    }

    public void FadeOut()
    {
        this.targetAlpha = 0.0f;
    }

    public void FadeIn()
    {
        this.targetAlpha = 1.0f;
    }

    private void OnDisable()
    {
        FadeOut();
    }
}