OpenCV学习笔记——点击显示鼠标坐标

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点击显示鼠标显示坐标，再次点击时上一次的坐标的会消失……

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#include<highgui.h>  
#include<cv.h>  
void on_mouse(int event, int x, int y, int flags, void* img)  
{  
    CvFont font;  
    cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);  
    if (event == CV_EVENT_LBUTTONDOWN)  
    {  
        IplImage *timg = cvCloneImage((IplImage *)img);  
        CvPoint pt = cvPoint(x, y);  
        char temp[16];  
        sprintf(temp, "(%d,%d)", x, y);  
        cvPutText(timg, temp, pt, &font, CV_RGB(250,0,0));  
        cvCircle(timg, pt, 2, cvScalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);  
        cvShowImage("src", timg);  
        cvReleaseImage(&timg);  
    }  
}  
  
int main()  
{  
    IplImage *img = cvLoadImage("timg.jpg", 1);  
    cvNamedWindow("src", 1);  
    cvSetMouseCallback("src", on_mouse,img);  
    cvShowImage("src", img);  
    cvWaitKey(0);  
    cvDestroyAllWindows();  
    cvReleaseImage(&img);  
    return 0;  
}  

#include<highgui.h>
#include<cv.h>
void on_mouse(int event, int x, int y, int flags, void* img)
{
CvFont font;
cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX, 0.5, 0.5, 0, 1, CV_AA);
if (event == CV_EVENT_LBUTTONDOWN)
{
IplImage *timg = cvCloneImage((IplImage *)img);
CvPoint pt = cvPoint(x, y);
char temp[16];
sprintf(temp, "(%d,%d)", x, y);
cvPutText(timg, temp, pt, &font, CV_RGB(250,0,0));
cvCircle(timg, pt, 2, cvScalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);
cvShowImage("src", timg);
cvReleaseImage(&timg);
}
}

int main()
{
IplImage *img = cvLoadImage("timg.jpg", 1);
cvNamedWindow("src", 1);
cvSetMouseCallback("src", on_mouse,img);
cvShowImage("src", img);
cvWaitKey(0);
cvDestroyAllWindows();
cvReleaseImage(&img);
return 0;
}