OpenCV >> C/C++

mouse

---

參考資訊：
1. mouse
2. setmousecallback

prototype

void setMouseCallback(
  const string& winname, 
  MouseCallback onMouse, 
  void* userdata=0);

main.cpp

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

using namespace std;
using namespace cv;

void mouseHandler(int event, int x, int y, int, void*)
{
  char buf[255]={0};

  switch(event){
  case EVENT_LBUTTONDOWN:
    strcpy(buf, "EVENT_LBUTTONDOWN");
    break;
  case EVENT_LBUTTONUP:
    strcpy(buf, "EVENT_LBUTTONUP");
    break;
  case EVENT_RBUTTONDOWN:
    strcpy(buf, "EVENT_RBUTTONDOWN");
    break;
  case EVENT_RBUTTONUP:
    strcpy(buf, "EVENT_RBUTTONUP");
    break;
  case EVENT_MBUTTONDOWN:
    strcpy(buf, "EVENT_MBUTTONDOWN");
    break;
  case EVENT_MBUTTONUP:
    strcpy(buf, "EVENT_MBUTTONUP");
    break;
  case EVENT_MOUSEMOVE:
    strcpy(buf, "EVENT_MOUSEMOVE");
    break;
  }
  Mat img(100, 400, CV_8UC3, Scalar(128, 255, 255));
  putText(img, buf, Point(50, 50), FONT_HERSHEY_SIMPLEX, 1, (0, 0, 0), 1, LINE_AA);
  imshow("mouse", img);
}
int main(int argc, char **argv)
{
  namedWindow("mouse", WINDOW_AUTOSIZE);
  setMouseCallback("mouse", mouseHandler, NULL);
  waitKey();
  return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(main)
find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
add_executable(main main.cpp)
target_link_libraries(main ${OpenCV_LIBS})

編譯並且執行

$ cmake .
$ make
$ ./main

完成

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