unity 指定位置截图

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已于 2022-06-22 17:22:30 修改

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文章标签： unity3d c#

于 2021-01-29 14:52:15 首次发布

本文链接：https://blog.youkuaiyun.com/qq_52786854/article/details/113386817

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使用一个image 来确定截图的位置

效果图：在这里插入图片描述
左边是截图出来的，右边是要截取的位置


	public GameObject iamge;  	//需要截取的位置
    //public RawImage image2;	//截取后贴到rawimage上
    public Camera uic;			//相机
    public Vector2 off;			//在外部调节截图区域
   


 //---------------------------
  public IEnumerator Pictures ()
    {
        yield return new WaitForSeconds(3);
        yield return new WaitForEndOfFrame();
		//得到截图区域
        var a = iamge.GetComponent<RectTransform>();
		
		//初始化一个Texture2D
        Texture2D screenShot = new Texture2D((int)(a.rect.width*(Screen.width /1920.0f)), 
        									(int)(a.rect.height*(Screen.width /1920.0f)),
        									 TextureFormat.RGB24, true);
      


        float x = a.localPosition.x + (Screen.width - a.rect.width) / 2;
        float y = a.localPosition.y + (Screen.height - a.rect.height) / 2;
        print(Screen.width);
        print(Screen.height);


		//转换坐标
        var temp = RectTransformUtility.WorldToScreenPoint(uic, a.position);
        
		//
        Rect position = new Rect(temp.x - a.rect.width*Screen.width /1920.0f / 2 + off.x,
        					     temp.y - a.rect.width*Screen.width /1920.0f / 2 + off.y,
                                 a.rect.width*Screen.width /1920.0f, 
                                 a.rect.height*Screen.width /1920.0f);

        Debug.Log(temp.x + "eee" + temp.y + "ee" + a.rect.width + "ee" + a.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();

        //image2.texture = screenShot;
        byte[] bytes = screenShot.EncodeToPNG();

        b=  Convert.ToBase64String(bytes);
   
    }