[游戏开发]Unity2d 学习笔记（二）相机自动跟踪主角

实现思路

我们给相机对象添加脚本后，在脚本中获取主角的位置信息，将主角的位置信息与相机的位置信息做对比，如果主角和相机的位置相差过大，则改变相机位置坐标。
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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// 这个脚本用来控制摄像机跟随角色移动
public class FellowPlayer : MonoBehaviour
{


    public GameObject player;

    public float speed = 50;

    //public float minPosX;
    //public float maxPosY;

    // Start is called before the first frame update
    void Start()
    {
        string tag = "Player";
        player = GameObject.FindGameObjectWithTag(tag);
        //Debug.Log("获取对象");
    }
    // Update is called once per frame
    void Update()
    {
        //FixCameraPos();
    }

    void FixedUpdate()
    {
        FixCameraPos();
    }


    void FixCameraPos()
    {
        float pPosX = player.transform.position.x;  //主角 x轴方向 时实坐标值
        float cPosX = transform.position.x;             //相机 x轴方向 时实坐标值

        float pPosY = player.transform.position.y;
        float cPosY = transform.position.y;

        //Debug.Log("主角坐标x=" + pPosX.ToString());

        // 当角色和相机之间的像素差大于这个值的时候才移动相机
        float value = 1;

        // 记录相机的新的坐标值
        float newPosX = transform.position.x;
        float newPosY = transform.position.y;

        if(pPosX - cPosX > value)
        {
            newPosX = cPosX + speed * Time.deltaTime;
            newPosY = cPosY;
        }
        else if (pPosX - cPosX < -value)
        {
            newPosX = cPosX - speed * Time.deltaTime;
            newPosY = cPosY;
        }
        else if (pPosY - cPosY > value)
        {
            newPosX = cPosX;
            newPosY = cPosY + speed * Time.deltaTime;
        }
        else if (pPosY - cPosY < -value)
        {
            newPosX = cPosX;
            newPosY = cPosY - speed * Time.deltaTime;
        }

        transform.position = new Vector3(newPosX, newPosY, transform.position.z);
           
        

    }
};