/*************************
 * UVAnimation function
 * LiuYu. 153250945@qq.com
 ************************/
using UnityEngine;

public class UVAnimation : MonoBehaviour 
{
	public bool pauseTimer = false;
    public Vector2 uvDefaultTiling = Vector2.one;
    public Vector2 uvDefaultOffset = Vector2.zero;
    public Vector2 uvOffsetSpeed = Vector2.zero;
    public Color matDefaultColor = Color.white;
	
	private Renderer _renderer;
	private Material _mat;
	Vector2 m_offset = new Vector2();
    Vector2 m_tiling = new Vector2();

    // Use this for initialization
    void Awake()
    {
        Renderer r = GetComponent<Renderer>();
        if (r)
        {
            _renderer = r;
        }
        else
        {
            enabled = false;
        }
        if (_renderer != null && _renderer.material != null)
        {
            _renderer.material.SetColor("_TintColor", matDefaultColor);
        }
    }

	void Start()
	{
		if (_renderer)
		{
			_mat = _renderer.material;
            m_offset = uvDefaultOffset;
            m_tiling = uvDefaultTiling;
            if (_mat != null)
            {
                _mat.mainTextureOffset = m_offset;
                _mat.mainTextureScale = m_tiling;
            }
        }

	}
	
	// Update is called once per frame
	void Update () 
	{
		if (uvOffsetSpeed.x != 0 || uvOffsetSpeed.y != 0)
        {
            m_offset.x += uvOffsetSpeed.x * (pauseTimer ? Time.deltaTime : Time.unscaledDeltaTime);
            if (m_offset.x > 1)
            {
                m_offset.x -= 1;
            }
            else if (m_offset.x < -1)
            {
                m_offset.x += 1;
            }
			m_offset.y += uvOffsetSpeed.y * (pauseTimer ? Time.deltaTime : Time.unscaledDeltaTime);
            if (m_offset.y > 1)
            {
                m_offset.y -= 1;
            }
            else if (m_offset.y < -1)
            {
                m_offset.y += 1;
            }
            _mat.mainTextureOffset = m_offset;
        }
	}
	
	void OnDestroy()
	{
		if (_mat != null)
		{
			GameObject.DestroyImmediate(_mat);
		}
	}
	
	
}