using UnityEngine;

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

public class SceneMask : MonoBehaviour
{
    #region 变量

    public Material Material
    {
        get
        {
            if (_Material == null)
            {
                _Material = GetComponent<SpriteRenderer>().material;
            }

            return _Material;
        }
        set { _Material = value; }
    }

    public Material _Material;

    #endregion


    public void SetArea(Transform tra, float radiusX, float radiusY)
    {
        Vector3 screenPos = Camera.main.WorldToScreenPoint(tra.position);
        
        screenPos = new Vector3(screenPos.x, Screen.height - screenPos.y, 0);
        
        Material.SetFloat("_RadiusX", radiusX*Screen.width/2);
        Material.SetFloat("_RadiusY", radiusY*Screen.width/2);
        Material.SetVector("_Center", screenPos);
    }
}