Overlay Qpaint on Camera example

rtvideo

I want to overlay two rectangles on top of the video stream from the camera example project.

void Camera::paintEvent(QPaintEvent * /*event*/)
{
    QPainter p{this};
    p.setPen(Qt::blue);
    p.drawRect(QRect(500,40,260,140));
    p.drawRect(QRect(700,0,150,150));
}

Right now this code successfully paints two rectangles, the only issue is it does not overlay on top of the video stream and it is behind it. How would i get it to be the top layer on the GUI so it overlaps the video stream.

SGaist

Hi,

Are you doing any image processing ?

Depending on what you want to do, you may have to use a custom QAbstractVideoSurface to modify the video frame before showing it.

A QVideoFilterRunnable might also be a solution but I think it requires QtQuick for the GUI.

rtvideo

I want to be able to create the rectangles as 640x480 and then be able to perform bitmap functions on them to crop the photo when a trigger is sent to only capture what is inside the 640x480 rectangles.