答え
#include <cv.h>
#include <highgui.h>
#include <cstdio>
#include <cmath>
#include <iostream>
using namespace std;
inline void CV_MAIN_LOOP();
int main( int argc, char **argv)
{
cvNamedWindow("window",CV_WINDOW_AUTOSIZE);
CV_MAIN_LOOP();
return 0;
}
/********** ここからメインループ ********************/
inline void CV_MAIN_LOOP()
{
#define PI_OVER_180 0.0174532925
IplImage *imgA=cvLoadImage("test2.jpg",CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR);
IplImage *tmp = cvCloneImage(imgA);
int frame=0;
char key;
int x,y;
while(1)
{
x = imgA->width/2 + int(50*cos(frame*PI_OVER_180));
y = imgA->height/2 + int(50 *sin(frame*PI_OVER_180));
cvCircle(tmp,cvPoint(x,y),3,cvScalar(255,0,0),CV_FILLED);
cvShowImage("window",tmp);
cvCopy(imgA,tmp);
key=(char)cvWaitKey(1);
if(key=='\033') break;
frame+=1;
if(frame>360) frame = 0;
}
cvReleaseImage( &imgA );
cvReleaseImage( &tmp);
cvDestroyWindow("window");
}