using UnityEngine;

using System.Collections;

public class camerafollow : MonoBehaviour {

    //主摄像机跟随主角一起移动

    public float xMargin = 1f;

    public float yMargin = 1f;

    public float xSmooth = 8f;

    public float ySmooth = 8f;

    public Vector2 maxXandY;

    public Vector2 minXandY;

	// Use this for initialization

    private Transform player;

	void Start () {
//这里获得是绑定的主角，需要一起跟随移动，就要获得主角的属性

        player = GameObject.FindGameObjectWithTag("pk_0").transform;

        maxXandY.x = 10; maxXandY.y = 10;

	}

    bool checkxmargin() {

        return Mathf.Abs(transform.position.x - player.position.x) > xMargin;

    }

    bool checkymargin() {

        return Mathf.Abs(transform.position.y - player.position.y) > yMargin;

    }

	// Update is called once per frame

	void Update () {

        Trackplayer();

	}

    //跟踪主角

    void Trackplayer() {

        float targetx = transform.position.x;

        float targety = transform.position.y;

        if (checkxmargin())

        {

            targetx = Mathf.Lerp(transform.position.x, player.position.x, xSmooth * Time.deltaTime);

        }

        if (checkymargin())

        {

            targety = Mathf.Lerp(transform.position.y, player.position.y, xSmooth * Time.deltaTime);

        }

        targetx = Mathf.Clamp(targetx, minXandY.x, maxXandY.y);

        targety = Mathf.Clamp(targety, minXandY.y, maxXandY.y);

        transform.position = new Vector3(targetx, targety,transform.position.z);

    }

}