Opencv draw ROI rect

/**
*@breif draw rect on image's face rect 
*@author [email protected]
*@date 2009.9.8
*@note http://blog.sciencenet.cn/blog-297739-261470.html 
*/
void CZFaceDetect::DrawFaceBox(CvRect* r, IplImage* imageOnlyFace, CString userName/* = "Don't Know"*/)
{
	if(isFaceROI)
	{
	//┏
	cvLine(imageOnlyFace,
		cvPoint(cvRound(r->x),cvRound(r->y)),
		cvPoint(cvRound(r->x)+20,cvRound(r->y)),
		CV_RGB(255,0,0),
		3,
		CV_AA,
		0
		);
	cvLine(imageOnlyFace,
		cvPoint(cvRound(r->x),cvRound(r->y)),
		cvPoint(cvRound(r->x),cvRound(r->y)+20),
		CV_RGB(255,0,0),
		3,
		CV_AA,
		0
		);
	//┑
	cvLine(imageOnlyFace,
		cvPoint(cvRound(r->x+r->width)-20,cvRound(r->y)),
		cvPoint(cvRound(r->x+r->width),cvRound(r->y)),
		CV_RGB(255,0,0),
		3,
		CV_AA,
		0
		);
	cvLine(imageOnlyFace,
		cvPoint(cvRound(r->x+r->width),cvRound(r->y)),
		cvPoint(cvRound(r->x+r->width),cvRound(r->y)+20),
		CV_RGB(255,0,0),
		3,
		CV_AA,
		0
		);

	CvFont nameFont;
	cvInitFont(&nameFont,CV_FONT_HERSHEY_COMPLEX ,0.8f,0.8f,0,2,8);
    cvPutText(imageOnlyFace, userName, cvPoint(cvRound(r->x),cvRound(r->y)-40), &nameFont, CV_RGB(0, 255, 0));

	//┗
	cvLine(imageOnlyFace,
	       cvPoint(cvRound(r->x),cvRound(r->y+r->height)-20),
		   cvPoint(cvRound(r->x),cvRound(r->y+r->height)),
           CV_RGB(255,0,0),
		   3,
		   CV_AA,
		   0
		   );   
	cvLine(imageOnlyFace,
		cvPoint(cvRound(r->x),cvRound(r->y+r->height)),
		cvPoint(cvRound(r->x)+20,cvRound(r->y+r->height)),
		CV_RGB(255,0,0),
		3,
		CV_AA,
		0
		);   
	//┛
	cvLine(imageOnlyFace,
		cvPoint(cvRound(r->x+r->width),cvRound(r->y+r->height)-20),
		cvPoint(cvRound(r->x+r->width),cvRound(r->y+r->height)),
		CV_RGB(255,0,0),
		3,
		CV_AA,
		0
		); 
	cvLine(imageOnlyFace,
		cvPoint(cvRound(r->x+r->width),cvRound(r->y+r->height)),
		cvPoint(cvRound(r->x+r->width)-20,cvRound(r->y+r->height)),
		CV_RGB(255,0,0),
		3,
		CV_AA,
		0
		); 
	}
}