12/29/2016

opencv mouse event example code


...
void CallBackFunc(int event, int x, int y, int flags, void* userdata)
{
 if (event == EVENT_LBUTTONDOWN)
 {
  printf("lLBUTTONDOWN down %d, %d \n", x, y);

  //circle( (*(Mat*)userdata), Point(x, y), 2, CV_RGB(255, 0, 0), 3);
 }
 else if (event == EVENT_RBUTTONDOWN)
 {
  printf("RBUTTONDOWN down %d, %d \n", x, y);
 }
 else if (event == EVENT_MBUTTONDOWN)
 {
  printf("MBUTTONDOWN down %d, %d \n", x, y);
 }
 else if (event == EVENT_MOUSEMOVE)
 {
  printf("move %d, %d \n", x, y);
 }
 
 //imshow("img", (*(Mat*)userdata)); //show
}


int main(int, char)
{
 namedWindow("img", 0);
 
 Mat img = imread("gh.jpg");
 

 setMouseCallback("img", CallBackFunc, &img);

 imshow("img", img); //show
 waitKey(0);


 /*
 while (1)
 {
  imshow("img", img); //show
  if (waitKey(10) > 0)
   break;
 }
 */

 destroyAllWindows();

 return 0;
}

...



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