opencv中在屏幕上每隔几秒显示一个点，并且保存点的坐标

<span style="font-size:18px;">#include<Windows.h>
#include<opencv2/imgproc/imgproc.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/objdetect/objdetect.hpp>
#include<vector>
#include<fstream>
#include<iostream>
#include<string>
using namespace std;
using namespace cv;
int main()
{
const Size sizepx(900, 900);
Mat screen(sizepx.width, sizepx.height, CV_32FC3);
screen.setTo(Scalar(255, 0, 0));
string filename = "E:data1.txt";
ofstream outFile(filename.c_str(), ios::app);  //在文件末尾写入
vector<Point> vectorp;

for (int i = 150; i < sizepx.height; i += 300)
{
for (int j = 150; j < sizepx.width; j += 300)
{

Point p = Point(i, j);
circle(screen, p, 8, Scalar(0, 255, 0), -1);
imshow("屏幕", screen);
waitKey(3000);
screen.setTo(Scalar(255, 0, 0));
vectorp.push_back(p);
cout << p.x << ' ' << p.y << endl;

}
}
for (int i = 0; i<vectorp.size(); i++)
{
outFile << vectorp[i].x << ' ' << vectorp[i].y;   //每列数据用 tab 隔开
outFile << endl;
}
/*waitKey(0);*/
return 0;
}</span>