Unity 循环滚屏

循环滚屏

using UnityEngine;
using System.Collections;

public class BackgroundRepeater : MonoBehaviour {
	private Transform cameraTransform;
	private float spriteWidth;

	// Use this for initialization
	void Start () {
		cameraTransform = Camera.main.transform;
		// It casts the object’s built-in renderer property to a SpriteRenderer in order to access its sprite property, 
		// from which it gets the Sprite’s bounds. 
		SpriteRenderer spriteRenderer = GetComponent<Renderer>() as SpriteRenderer;
		spriteWidth = spriteRenderer.sprite.bounds.size.x;
	
	}
	
	// Update is called once per frame
	void Update () {
		transform.Translate(-Time.deltaTime*2.3f, 0, 0);
		// Background sprite is well offscreen when positioned exactly one-sprite’s width away from the camera’s position.
		if((transform.position.x + spriteWidth) < cameraTransform.position.x)
		{
			Vector3 newPos = transform.position;
			newPos.x += 2.0f * spriteWidth;
			transform.position = newPos;
		}
	
}
}