cvSetMouseCallback使用

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void cvSetMouseCallback( const char* window_name, CvMouseCallback on_mouse, void* param=NULL );

window_name 回掉函数需要注册到的窗口，即产生事件的窗口

on_mouse 在注册窗口点击鼠标时，执行的回掉函数

param 用于传递到回掉函数的参数

#include "cv.h"
#include "highgui.h"
#include <stdio.h>
#include <cxcore.h>
static unsigned int gPosition = 0;
static IplImage *src = NULL;
static IplImage *dst = NULL;
static CvPoint cvLeftAxis={-1,-1};
static CvPoint cvRightAxis={-1,-1};
static CvFont font;
static void cvOnMouseCallBack(int event,int x,int y,int flags,void *param)
{
   switch(event)
   {
        case CV_EVENT_LBUTTONDOWN:
       cvLeftAxis.x = x;
       cvLeftAxis.y = y;
       break;
       case CV_EVENT_MOUSEMOVE:
       cvRightAxis.x = x;
       cvRightAxis.y = y;
       break;
           case CV_EVENT_LBUTTONUP:
       cvSetImageROI(src,cvRect(cvLeftAxis.x,cvLeftAxis.y,cvRightAxis.x,cvRightAxis.y));
       dst = cvCreateImage(cvGetSize(src),src->depth,src->nChannels);
       cvCopy(src,dst,NULL);
       cvNamedWindow("DstImage",1);
       cvShowImage("DstImage",dst);
       cvResetImageROI(src);
       cvRectangle(src,cvLeftAxis,cvRightAxis,cvScalar(0,125,12,125),1,8,0);
       cvShowImage("SrcImage",src);
       break;
       default:break;
   }

}
int main(int argv,char **argc)
{

   if(argv==2&&(src = cvLoadImage(argc[1],1)))
   {
       cvNamedWindow("SrcImage",1);
       cvInitFont(&font,CV_FONT_HERSHEY_SIMPLEX,1,1,1,2,8);
       cvSetMouseCallback("SrcImage",cvOnMouseCallBack,NULL);
       cvShowImage("SrcImage",src);
       cvWaitKey(0);
       cvReleaseImage(&src);
       cvReleaseImage(&dst);
       cvDestroyAllWindows();
   }
   return 0;
}

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