unity中 截图

unity中 截图的两种常用方式 区域截图和相机截图
区域截图：可以截图区域内全部元素
相机截图：可以截图区域内自己想要的元素

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

public class ScreenTexture : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        
    }
    /// <summary>
    /// 区域截图
    /// </summary>
    /// <param name="rectT"></param>
    /// <param name="ac"></param>
    /// <returns></returns>
    public IEnumerator GetScreenTexture(RectTransform rectT, Action<Texture2D> ac)
    {
        yield return new WaitForEndOfFrame();
        Texture2D screenShot = new Texture2D((int)rectT.rect.width, (int)rectT.rect.height, TextureFormat.RGB24, true);
        float x = rectT.anchoredPosition3D.x;// + (Screen.width - rectT.rect.width) / 2;//锚点在左下角
        float y = rectT.anchoredPosition3D.y; //+ (Screen.height - rectT.rect.height) / 2;
        Rect position = new Rect(x, y, rectT.rect.width, rectT.rect.height);
        screenShot.ReadPixels(position, 0, 0, true);//按照设定区域读取像素；注意是以左下角为原点读取
        screenShot.Apply();
        ac(screenShot);//回调函数


        //string fileName = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
        //string filePath = "";
        //filePath = Application.streamingAssetsPath + "/HeadFold";
        //string scrPathName = filePath + "/" + fileName;
        //if (!Directory.Exists(filePath))
        //{
        //    Directory.CreateDirectory(filePath);
        //}
        二进制转换
        //byte[] byt = screenShot.EncodeToJPG();
        //File.WriteAllBytes(scrPathName, byt);

    }
    public Camera camera1;
    /// <summary>
    /// 相机截图
    /// 
    /// </summary>
    /// <param name="rectT"></param>
    /// <param name="ac"></param>
    /// <returns></returns>
    public IEnumerator GetScreenCanTexture(RectTransform rectT, Action<Texture2D> ac)
    {
        yield return new WaitForEndOfFrame();
        Texture2D screenShot = new Texture2D(100, 100);
        Rect rect = new Rect(0, 0, rectT.rect.width, rectT.rect.height);
        RenderTexture rt = new RenderTexture((int)(Screen.width), (int)(Screen.height), 0);//先设置一个RenderTexture，大小为屏幕分辨率

        camera1.targetTexture = rt;
        camera1.Render();//手动开启截图相机的渲染
        RenderTexture.active = rt;//激活这个RenderTexture
                                  //验算是否超出屏幕渲染，如果超出则取最大边界
                                  //float width = rect.width + rect.x > Screen.width ? Screen.width - rect.x : rect.width;
                                  //float height = rect.height + rect.y > Screen.height ? Screen.height - rect.y : rect.height;
        float x = rectT.anchoredPosition3D.x;//锚点在左下角
        float y = rectT.anchoredPosition3D.y;
        Rect position = new Rect(x, y, rect.width, rect.height);
        //新建一个模板Texture2D等待相机渲染图像，设定Textrue2D的大小为我们需要的大小

        screenShot = new Texture2D((int)rectT.rect.width, (int)rectT.rect.height, TextureFormat.RGB24, false);
        // 注：这个时候，它是从RenderTexture.active中读取像素
        screenShot.ReadPixels(position, 0, 0);//按照设定区域读取像素；注意是以左下角为原点读取
        screenShot.Apply();//保存像素信息
        ac(screenShot);     //回调函数          
        camera1.targetTexture = null; // 重置相关参数，以使用camera继续在屏幕上显示

        RenderTexture.active = null;
        Destroy(rt);

    }
}