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

public class CameraAdjust : MonoBehaviour
{
    public int logicalScreenWidth = 720;
    public int logicalScreenHeight = 1280;
    void Awake()
    {
        Camera camera = GetComponent<Camera>();
        float manualHeight;
        //然后得到当前屏幕的高宽比 和 你自定义需求的高宽比。通过判断他们的大小，来不同赋值
        if (1.0f * Screen.height / Screen.width > 1.0f * logicalScreenHeight / logicalScreenWidth)
        {
            //如果屏幕的高宽比大于自定义的高宽比 。则通过公式  logicalScreenWidth * manualHeight = Screen.width * Screen.height；
            //来求得适应的manualHeight ，用它求出 实际高度与理想高度的比率 scale
            manualHeight = 1.0f * logicalScreenWidth / Screen.width * Screen.height;
        }
        else
        {   //否则 直接给manualHeight 自定义的 logicalScreenHeight 的值，那么相机的fieldOfView就会原封不动
            manualHeight = 1.0f * logicalScreenHeight;
        }
        float scale = manualHeight*1.0f / logicalScreenHeight;
        //Camera.fieldOfView 视野:  这是垂直视野：水平FOV取决于视口的宽高比，当相机是正交时fieldofView被忽略
        //把实际高度与理想高度的比率scale乘加给Camera.fieldOfView。
        //这样就能达到自动调节分辨率的效果
        camera.fieldOfView *= scale;
    }
}