opencv鼠标事件

#include <opencv2\opencv.hpp>

using namespace cv;

struct mouse_para
{
	cv::Mat org;
	cv::Mat img;

	std::string winName = "";

	// todo: you can add your own members here.
};

void on_mouse(int event, int x, int y, int flags, void *_ustc) // event鼠标事件代号，x,y鼠标坐标，flags拖拽和键盘操作的代号
{
	mouse_para *ustc = static_cast<mouse_para*>(_ustc);

	static Point pre_pt = (-1, -1);//初始坐标
	static Point cur_pt = (-1, -1);//实时坐标  

	char temp[16];
	if (event == CV_EVENT_LBUTTONDOWN)
	{
		std::cout << "Left buttom down !" << std::endl;
		// todo: you can add your own code here.
	}
	else if (event == CV_EVENT_MOUSEMOVE && !(flags & CV_EVENT_FLAG_LBUTTON))//左键没有按下的情况下鼠标移动的处理函数
	{
		std::cout << "(" << x << ", " << y << ")" << std::endl;
		// todo: you can add your own code here.
	}
	else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))//左键按下时，鼠标移动
	{
		std::cout << "Left buttom down and mouse move!" << std::endl;
		// todo: you can add your own code here.
	}
	else if (event == CV_EVENT_LBUTTONUP)//左键松开
	{
		std::cout << "Left buttom up!" << std::endl;
		// todo: you can add your own code here.
	}

	//ustc->org.copyTo(ustc->img);
	//imshow("img", ustc->img);

}

int main()
{
	mouse_para mp;
	mp.org = cv::Mat::ones(500, 500, CV_8UC1);
	mp.org.copyTo(mp.img);
	mp.winName = "img";

	namedWindow(mp.winName);//定义一个img窗口
	setMouseCallback(mp.winName, on_mouse, &mp);//调用回调函数  

	for (int i=0; i<255;++i)
	{
		i = i % 250;
		mp.org = i*cv::Mat::ones(500,500, CV_8UC1);
		mp.org.copyTo(mp.img);

		imshow(mp.winName, mp.img);
		cv::waitKey(10);
	}

	return 0;
}