QML screen rotation

[anderi1982]

Can one show a simple example that would have the same behavior as QT_QPA_EGLFS_ROTATION=270 which works perfectly for me for widget based applications but instead in QML?

I'm running a Raspberry PI 4B with the 800x480 7 inch touchscreen.

I have this:

import QtQuick 2.7
import QtQuick.Controls 2.12
import QtQuick.Window 2.2

ApplicationWindow {
    visible: true
    Item {
      anchors.fill: parent
      transform: Rotation {
          angle: 270
          origin.x: Screen.width/2
          origin.y: Screen.height/2
       }
       Rectangle {
            anchors.centerIn: parent
            width: 480
            height: 800

            Image {
                sourceSize.width: parent.width
                sourceSize.height: parent.height
                source: "./images/background.png"
                fillMode: Image.PreserveAspectCrop
            }

            Rectangle {
                anchors.fill: parent
                color: "transparent"

                Text {
                    text: "Hello world"
                    font.pixelSize: 48
                    color: "white"
                }
        }
    }
}

Which seem to work, but I dont understand why I cant use anchors.fill: parent in the top Rectangle for example, and also why I need to set the size explicitly. This makes me feel it's not the optimal way since QT_QPA_EGLFS_ROTATION seem to do all the proper stuff (unless running qml...)

Best regards,
Andreas