//	string imageName("d:/image/size13x13.png"); // by default

#include "opencv2/imgcodecs.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/core/core.hpp"
#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;
/**
* @function main
* @brief Main function
*/

void cbMouse(int event, int x, int y, int flags, void*);
void tb1_Callback(int value, void *);
void pushbuttonCallBack(int, void *font);

Mat orig_img, tmp_img;
const char main_win[] = "main_win";
const char sub_win[] = "sub_win";
char msg[50];

void tb1_Callback(int value, void *) {
	sprintf(msg, "Trackbar 1 changed. New value=%d", value);
	cout << msg << endl;
	// displayOverlay(main_win, msg);
	return;
}



void cbMouse(int event, int x, int y, int flags, void*) {
	// Static vars hold values between calls
	static Point p1, p2;
	static bool p2set = false;
	// Left mouse button pressed
	if (event == EVENT_LBUTTONDOWN) {
		p1 = Point(x, y); // Set orig. point
		p2set = false;
	}
	else if (event == EVENT_MOUSEMOVE &&
		flags == EVENT_FLAG_LBUTTON) {
		// Check moving mouse and left button down
		// Check out bounds
		if (x > orig_img.size().width)
			x = orig_img.size().width;
		else if (x < 0)
			x = 0;
		// Check out bounds
		if (y > orig_img.size().height)
			y = orig_img.size().height;
		else if (y < 0)
			y = 0;
		p2 = Point(x, y); // Set final point
		p2set = true;
		// Copy orig. to temp. image
		orig_img.copyTo(tmp_img);
		// Draws rectangle
		rectangle(tmp_img, p1, p2, Scalar(0, 0, 255));
		// Draw temporal image with rect.
		imshow(main_win, tmp_img);
	}
	else if (event == EVENT_LBUTTONUP
		&& p2set) {
		// Check if left button is released
		// and selected an area
		// Set subarray on orig. image
		// with selected rectangle
		Mat submat = orig_img(Rect(p1, p2));
		// Here some processing for the submatrix
		//...
		// Mark the boundaries of selected rectangle
		rectangle(orig_img, p1, p2, Scalar(0, 0, 255), 2);
		imshow("main_win", orig_img);
	}
	return;
}



void pushbuttonCallBack(int, void *font) {
	// Add text to the image
	addText(orig_img, "Push button clicked",
		Point(50, 50), *((QtFont *)font));
	imshow(main_win, orig_img); // Shows original image
	return;
}

int main(void)
{

	const char track1[] = "TrackBar 1";
	int tb1_value = 50; // Initial value of trackbar 1
	
	orig_img = imread("d:/image/cameraman2.tif"); // Open and read the image
	if (orig_img.empty()) {
		cout << "Error!!! Image cannot be loaded..." << endl;
		return -1;
	}
	namedWindow(main_win); // Creates main window
						   // Creates a font for adding text to the image
	// Creation of CallBack functions
	 setMouseCallback(main_win, cbMouse, NULL);
	createTrackbar(track1, main_win, &tb1_value,
		100, tb1_Callback);

	imshow(main_win, orig_img); // Shows original image
	cout << "Press any key to exit..." << endl;
	waitKey(); //
	destroyWindow("Example1");
	return 0;
}