在OpenCV中调用鼠标事件

来源：互联网发布：阴阳师御魂副属性数据编辑：程序博客网时间：2024/05/21 16:14

需要用到这个函数:cvSetMouseCallback

cvSetMouseCallback( const char* window_name, CvMouseCallback on_mouse,                                void* param CV_DEFAULT(NULL));1
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第一个参数为窗口名，第二个为用于处理的函数。

那个用于处理的函数如下：

typedef void (CV_CDECL *CvMouseCallback )(int event, int x, int y, int flags, void* param);1
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event为所发生的事件名
x，y为鼠标在图片上的坐标

然后，这是全部的事件

enum{    CV_EVENT_MOUSEMOVE      =0,   //鼠标移动    CV_EVENT_LBUTTONDOWN    =1,   //按下左键    CV_EVENT_RBUTTONDOWN    =2,   //按下右键    CV_EVENT_MBUTTONDOWN    =3,   //按下中键    CV_EVENT_LBUTTONUP      =4,   //放开左键    CV_EVENT_RBUTTONUP      =5,   //放开右键    CV_EVENT_MBUTTONUP      =6,   //放开中键    CV_EVENT_LBUTTONDBLCLK  =7,   //左键双击    CV_EVENT_RBUTTONDBLCLK  =8,   //右键双击    CV_EVENT_MBUTTONDBLCLK  =9,   //中键双击    CV_EVENT_MOUSEWHEEL     =10,  //滚轮滚动    CV_EVENT_MOUSEHWHEEL    =11   //横向滚轮滚动（还好我鼠标是G502可以这么干）};enum{    CV_EVENT_FLAG_LBUTTON   =1,   //左键拖拽    CV_EVENT_FLAG_RBUTTON   =2,   //右键拖拽    CV_EVENT_FLAG_MBUTTON   =4,   //中键拖拽    CV_EVENT_FLAG_CTRLKEY   =8,   //按住CTRL拖拽    CV_EVENT_FLAG_SHIFTKEY  =16,  //按住Shift拖拽    CV_EVENT_FLAG_ALTKEY    =32   //按住ALT拖拽};1
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下面是我自己写的按下右键画图的代码：

#define _CRT_SECURE_NO_DEPRECATE#include <iostream>#include <stdio.h>#include "opencv2/core.hpp"#include "opencv2/core/utility.hpp"#include "opencv2/core/ocl.hpp"#include "opencv2/imgcodecs.hpp"#include "opencv2/highgui.hpp"#include "opencv2/features2d.hpp"#include "opencv2/calib3d.hpp"#include "opencv2/imgproc.hpp"#include"opencv2/flann.hpp"#include"opencv2/xfeatures2d.hpp"#include"opencv2/ml.hpp"using namespace cv;using namespace std;using namespace cv::xfeatures2d;using namespace cv::ml;Mat src;bool down = false;Point prept = Point(-1, -1);Point curpt = Point(-1, -1);void on_mouse(int event, int x, int y, int flags, void* ustc){    if (event == CV_EVENT_LBUTTONDOWN)    //右键按下    {        prept = Point(x, y);        down = true;    }    else if (event == CV_EVENT_LBUTTONUP)     //右键放开        down = false;    if (down ==true&&event == CV_EVENT_MOUSEMOVE)    //右键按下且鼠标移动    {        curpt = cvPoint(x, y);        line(src, prept, curpt, Scalar(255, 0, 0), 5);        waitKey(5);        //可以解决画图时卡顿的问题        imshow("src", src);        prept = curpt;    }}int main(){    src = imread("7f6a384c510fd9f9da3ee67b232dd42a2834a40d.jpg");    cvNamedWindow("src");    cvSetMouseCallback("src", on_mouse, 0);    imshow("src", src);    cvWaitKey(0);    cvDestroyAllWindows();    return 0;}1
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效果图
这里写图片描述

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