Different coordinates after setGeometry applied to QGraphicsView

[DemensDeum]

Summary:
Windows 11, Qt 6. I apply setGeometry to QGraphicsView which is inside of QMainWindow, but in result I get QGraphicsView in different x and y coordinates.
I use view.setGeometry(120, 120, 320, 240); and get QGraphicsView in x 150 and y 150 coordinates, I expect it to be x 120, y 120.

Code:

#include <QApplication>
#include <QMainWindow>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsVideoItem>
#include <QMediaPlayer>
#include <QAudioOutput>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    // Create the main window
    QMainWindow mainWindow;
    mainWindow.setWindowTitle("Video Player");
    mainWindow.setGeometry(100, 100, 800, 600);

    // Create a central widget to hold the QGraphicsView
    QWidget centralWidget;
    mainWindow.setCentralWidget(¢ralWidget);

    // Create a QGraphicsView and a QGraphicsScene
    QGraphicsView view(¢ralWidget);
    QGraphicsScene scene;
    view.setScene(&scene);
    view.setGeometry(120, 120, 320, 240);

    // Create a QMediaPlayer and set the media content
    QMediaPlayer mediaPlayer;
    mediaPlayer.setSource(QUrl::fromLocalFile("PM5544.mp4"));

    // Create a QGraphicsVideoItem and set the media player
    QGraphicsVideoItem videoItem;
    QAudioOutput audioOutput;

    // Add the video item to the scene
    scene.addItem(&videoItem);

    mediaPlayer.setAudioOutput(&audioOutput);
    mediaPlayer.setVideoOutput(&videoItem);

    // Play the video
    mediaPlayer.play();

    // Show the main window
    mainWindow.show();

    return app.exec();
}

Is that a bug, or I am doing something wrong?

[JonB]

@DemensDeum said in Different coordinates after setGeometry applied to QGraphicsView:

and get QGraphicsView in x 150 and y 150 coordinates

Can you show in your code (e.g. a qDebug() statement) where you are seeing this, please?

[DemensDeum]

@JonB hello, I am checking coordinates in GIMP, here is screenshot of code in first post.

And here is GIMP selection, that showing that actual coordinates is x: 150, y: 150

[KenAppleby 0]

@DemensDeum
I think you're seeing the difference between logical and physical pixels.

When I run your code, the following:

   // Show the main window
   mainWindow.show();

   qDebug() << view.geometry() << QGuiApplication::primaryScreen()->devicePixelRatio();

prints out:

QRect(120,120 320x240) 1.5

and when I look at a screen dump the graphics view is offset by 180x180 physical pixels, as expected from the pixel ratio printed.

[DemensDeum]

@KenAppleby-0 Thank you.
Now I am trying to understand why every app adapt dpi differently, Gimp, Firefox and Qt.