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

namespace MyFrameworkPure
{
    public static class CameraExtension
    {
        /// <summary>
        /// 摄像机的横向视口角度
        /// </summary>
        /// <param name="cam"></param>
        /// <returns></returns>
        public static float HorizontalFov(this Camera cam)
        {
            var radAngle = cam.fieldOfView * Mathf.Deg2Rad;
            var radHfov = 2 * Math.Atan(Mathf.Tan(radAngle / 2) * cam.aspect);
            var hFov = Mathf.Rad2Deg * radHfov;
            return (float)hFov;
        }
    }
}