Scroll big image using opencv trackbar

ImgScrollBar.cpp

int slider_max, slider, displayHeight;
int displayWidth = 1900;
Mat src1;
Mat dst;
cv::Rect roi;

static void on_trackbar(int, void*)
{
	roi = cv::Rect(slider, 0, displayWidth, displayHeight);
	dst = src1(roi);

	imshow("Stitch Result", dst);
}
int main(void)
{
	src1 = imread("D:/C_Backup_Folder/Ivan_codes/DeepRoadStitching/Result/curved.MP4_0.jpg");
	cv::rotate(src1, src1, cv::ROTATE_90_CLOCKWISE);
	cv::resize(src1, src1, cv::Size(src1.cols/2, src1.rows/2));
	if (src1.empty()) { cout << "Error loading src1 \n"; return -1; }

	slider_max = src1.cols - displayWidth;
	slider = 0;
	displayHeight = src1.rows;

	namedWindow("Stitch Result", WINDOW_AUTOSIZE); // Create Window
	char TrackbarName[50];
	sprintf(TrackbarName, "Pixel Pos");
	createTrackbar(TrackbarName, "Stitch Result", &slider, slider_max, on_trackbar);
	on_trackbar(slider, 0);
	waitKey(0);
	return 0;
}