using UnityEngine;

using System.Collections;

public class jietu : MonoBehaviour {

    int w, h;

    Vector3 v1, v2;

    void Update()

    {

        //按下鼠标拖动直至松开鼠标划定范围，截图

        if (Input.GetMouseButtonDown())

        {

            v1 = Input.mousePosition;//鼠标按下位置~

        }

        if (Input.GetMouseButtonUp())

        {

            v2 = Input.mousePosition; //鼠标抬起位置~

            //计算鼠标划定范围的长和宽~~

            w = int.Parse(Mathf.Abs(v1.x - v2.x).ToString());

            h = int.Parse(Mathf.Abs(v1.y - v2.y).ToString());

            StartCoroutine(GetCapture());

        }

    }

    IEnumerator GetCapture()

    {

        //等待所有的摄像机跟GUI渲染完成

        yield return new WaitForEndOfFrame();

        Texture2D tex = new Texture2D(w, h, TextureFormat.RGB24, false);

        //----------------------------------------------------------------------------计算区域----------------------------------------------------

        float vx = (v1.x > v2.x) ? v2.x : v1.x;                                 //取较小的x,y作为起始点

        float vy = (v1.y > v2.y) ? v2.y : v1.y;

        tex.ReadPixels(new Rect(vx, vy, w, h), , , true);

        //-----------------------------------------------------------------------------------------------------------------------------------------

        byte[] imagebytes = tex.EncodeToPNG();//转化为png图

        tex.Compress(false);//对屏幕缓存进行压缩

        System.IO.File.WriteAllBytes(Application.dataPath + "/hehe.png", imagebytes);//存储png图

    }

}