battlearray_client/Assets/Scripts/Battle/Map/Utils/SkyBackground.cs

using UnityEngine;
using System.Collections;

public class SkyBackground : MonoBehaviour {

	//支持中文%
	// Use this for initialization
	void Start () {
		Update();
	}
	
	// Update is called once per frame
	public void Update () 
	{
		Vector3 left = Camera.main.ScreenToWorldPoint(new Vector3(0, Screen.height/2f, 0));

		Vector3 position = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width/2f, Screen.height/2f, 50f));
		transform.position = position;

		float width = Mathf.Abs(position.x-left.x);
		Vector3 scale = transform.localScale;
		scale.x = scale.y = width*2f;
		transform.localScale = scale;
	}
}