OpencV图像几何形状绘制

QString appPath = QCoreApplication::applicationDirPath();
  imagePath = appPath + "/A.jpg";
  img = cv::imread(imagePath.toStdString());
  if (img.empty())
    return;
  Mat bg = Mat::zeros(img.size(),img.type());
  Rect rect;
  rect.x = 200;
  rect.y = 200;
  rect.width = 100;
  rect.height = 50;
  rectangle(bg, rect, Scalar(0, 0, 255), -1,8,0);
  circle(bg, Point(50, 100), 15, Scalar(255, 0, 0), 2);
  line(bg, Point(100, 100), Point(100, 200), Scalar(0, 255, 0), 2, LINE_AA, 0);
  RotatedRect rrt(Point(200, 200),Size(100, 200), 90.0);
  ellipse(bg, rrt, Scalar(0, 255, 255), 2, 8);
  Mat dst;
  addWeighted(img, 0.7,bg,0.3,0, dst);
  imshow("Draw", dst);