opencv的鼠标以及键值使用

enum
{
    CV_EVENT_MOUSEMOVE      =0,        //鼠标移动
    CV_EVENT_LBUTTONDOWN    =1,        //鼠标左键按下
    CV_EVENT_RBUTTONDOWN    =2,        //鼠标右键按下
    CV_EVENT_MBUTTONDOWN    =3,        //鼠标中键按下
    CV_EVENT_LBUTTONUP      =4,        //鼠标左键弹起
    CV_EVENT_RBUTTONUP      =5,        //鼠标右键弹起
    CV_EVENT_MBUTTONUP      =6,        //鼠标中键弹起
    CV_EVENT_LBUTTONDBLCLK  =7,        //鼠标左键双击
    CV_EVENT_RBUTTONDBLCLK  =8,        //鼠标右键双击
    CV_EVENT_MBUTTONDBLCLK  =9         //鼠标中键双击
};

enum
{
    CV_EVENT_FLAG_LBUTTON   =1,     //鼠标左键拖拽(按下鼠标左键，然后在窗口中拖动鼠标)
    CV_EVENT_FLAG_RBUTTON   =2,     //鼠标右键拖拽
    CV_EVENT_FLAG_MBUTTON   =4,     //鼠标中键拖拽
    CV_EVENT_FLAG_CTRLKEY   =8,     //按下键值CTRL不放
    CV_EVENT_FLAG_SHIFTKEY  =16,    //按下键值SHIFT不放
    CV_EVENT_FLAG_ALTKEY    =32     //按下键值ALT不放
};

#include <math.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv/cv.h>
 
using namespace cv;
 
cv::Mat src;
char pic_name[20];
int pic_info[4];
 
void on_mouse( int event, int x, int y, int flags, void* ustc)  
{  
	if(event == CV_EVENT_LBUTTONDOWN){
		pic_info[0] = x;   /*width1*/
		pic_info[1] = y;   /*height1*/
		pic_info[2] = 0;   /*width2*/
		pic_info[3] = 0;   /*height2*/
	}else if(event == CV_EVENT_LBUTTONUP){
		pic_info[2] = x;
		pic_info[3] = y;
		src=cv::imread(pic_name,1);  
		cv::rectangle(src,cvPoint(pic_info[0], pic_info[1]),cvPoint(pic_info[2], pic_info[3]),cvScalar(255,0,0),2);	
		cv::imshow("src",src);
	}
	if(flags == CV_EVENT_FLAG_LBUTTON){
		pic_info[2] = x;
		pic_info[3] = y;
		src=cv::imread(pic_name,1);  
		cv::rectangle(src,cvPoint(pic_info[0], pic_info[1]),cvPoint(pic_info[2], pic_info[3]),cvScalar(255,0,0),2);	
		cv::imshow("src",src);
	}
	printf("%d %d %d %d
", pic_info[0], pic_info[1], pic_info[2], pic_info[3]);
}  
 
int main(int agrc, char* argv[]){
	bool exit = false;
	char c;
	cv::Mat imageROI;
 
	memcpy(pic_name,argv[1],sizeof(argv[1]));
 
	src=cv::imread(pic_name,1);  
	cv::imshow("src",src);
 
	cvSetMouseCallback( "src", on_mouse, NULL);
	while(!exit){
		c = cv::waitKey(0);
		if(c == 'c'){
			if((pic_info[0] != 0) && (pic_info[1] != 0) && (pic_info[2] != 0) && (pic_info[3] != 0)){
				imageROI = src(cv::Rect(pic_info[0], pic_info[1], pic_info[2]-pic_info[0], pic_info[3]-pic_info[1]));
				cv::imshow("ROI", imageROI);
			}
		}else if(c == 'q'){
			exit = true;	
		}
	}
	cvDestroyAllWindows();  
 
	return 0;  
}