c++ - How to erase cv::circle from display window

Question

I use OpenCV library for drawing circles on image. I need to erase last circle which was drawn on window by clicking on right button click. Currently, I wrote workaround, I replace red circle by white. but seems there is another solution such as erase it. How I can update my UI?

std::vector<Point2f> right_image;    // stores 4 points that the user clicks(mouse left click) in the main image.


if (e == EVENT_RBUTTONDOWN && right_image.size() > 0) {
            float x0 = right_image[right_image.size()-1].x;
            float y0 = right_image[right_image.size()-1].y;
            cv::circle(dispImg, cv::Point(x0, y0), 10, cv::Scalar(255, 255, 255), 3);
            cv::imshow(cv::String(fullWindowName), dispImg);
            right_image.pop_back();
        }

question from:https://stackoverflow.com/questions/65651652/how-to-erase-cvcircle-from-display-window

Answer 1

It will be faster to store image without any overlays, and redraw circles each frame. If you want to append, move or delete circle just remove it from the list of objects to plot.