OpenCV Mouse Event Handler

OpenCV_Mouse_Event_Handler.cpp

#include "opencv2/opencv.hpp"
#include <iostream>

using namespace cv;
using namespace std;

Mat frame;

void mouseEventHandler(int event, int x, int y, int flags, void* param)
{
	if  ( event == EVENT_LBUTTONDOWN )
	{
		cout << "Left button of the mouse is clicked DOWN - position (" << x << ", " << y << ")" << endl;
	}
	else if  ( event == EVENT_LBUTTONUP )
	{
		cout << "Left button of the mouse is clicked UP - position (" << x << ", " << y << ")" << endl;
	}
	else if  ( event == EVENT_LBUTTONDBLCLK )
	{
		cout << "Left button of the mouse is double clicked - position (" << x << ", " << y << ")" << endl;		
	}
	else if  ( event == EVENT_RBUTTONDOWN )
	{
		cout << "Right button of the mouse is clicked DOWN - position (" << x << ", " << y << ")" << endl;
	}
	else if  ( event == EVENT_RBUTTONUP )
	{
		cout << "Right button of the mouse is clicked UP - position (" << x << ", " << y << ")" << endl;
	}
	else if  ( event == EVENT_RBUTTONDBLCLK )
	{
		cout << "Right button of the mouse is double clicked - position (" << x << ", " << y << ")" << endl;
	}
	else if  ( event == EVENT_MBUTTONDOWN )
	{
		cout << "Middle button of the mouse is clicked DOWN - position (" << x << ", " << y << ")" << endl;
	}
	else if  ( event == EVENT_MBUTTONUP )
	{
		cout << "Middle button of the mouse is clicked UP - position (" << x << ", " << y << ")" << endl;
	}
	else if  ( event == EVENT_MBUTTONDBLCLK )
	{
		cout << "Middle button of the mouse is double clicked - position (" << x << ", " << y << ")" << endl;
	}
	else if ( event == EVENT_MOUSEMOVE )
	{
		cout << "Mouse move over the window - position (" << x << ", " << y << ")" << endl;
	}
}

void showWindow()
{
  	//Create an autoresize window
	namedWindow("My Window", 1);

	//Set the callback function for any mouse event
	setMouseCallback("My Window", mouseEventHandler, NULL);

	//Show the image
	frame = cv::imread("0001_.jpg");
	imshow("My Window", frame);

	//Wait until user press some key
	waitKey(0);
}