using UnityEngine;
using System.Collections;
using System.IO;
using UnityEngine.UI;
public class ScreenshotNow : MonoBehaviour 
{
	public RectTransform rectT; // Assign the UI element which you wanna capture
    public Image img;
	int width; // width of the object to capture
	int height; // height of the object to capture
	// Use this for initialization
	void Start () 
	{
		width = System.Convert.ToInt32(rectT.rect.width); 
		height = System.Convert.ToInt32(rectT.rect.height);
	}	
	// Update is called once per frame
	void Update () 
	{
		if (Input.GetMouseButtonDown (0)) 
		{
			//StartCoroutine(takeScreenShot ()); // screenshot of a particular UI Element.
		}
		if (Input.GetKeyDown (KeyCode.A)) 
		{
			ScreenCapture.CaptureScreenshot("FullPageScreenShot.png");
		}
	
	}
	public IEnumerator takeScreenShot()
	{
		yield return new WaitForEndOfFrame (); // it must be a coroutine 

		Vector2 temp = rectT.transform.position;
		var startX = temp.x - width/2;
		var startY = temp.y - height/2;
		var tex = new Texture2D (width, height, TextureFormat.RGB24, false);
		tex.ReadPixels (new Rect(startX, startY, width, height), 0, 0);
		tex.Apply ();

		// Encode texture into PNG
		var bytes = tex.EncodeToPNG();
		Destroy(tex);

		//File.WriteAllBytes(Application.dataPath + "ScreenShot.png", bytes);

        string imgsrc = System.Convert.ToBase64String(bytes);
        Texture2D scrnShot = new Texture2D(1, 1, TextureFormat.ARGB32, false);
        scrnShot.LoadImage(System.Convert.FromBase64String(imgsrc));

        Sprite sprite = Sprite.Create(scrnShot, new Rect(0, 0, scrnShot.width, scrnShot.height), new Vector2(.5f, .5f));
        img.sprite = sprite; 

    }
    public void Capture()
    {
        StartCoroutine(takeScreenShot()); // screenshot of a particular UI Element.
    }
}