video demo @ https://twitter.com/ShinyQuagsire/status/1213701585491988487

qt5-pen-tilt-rotation.diff

diff -r /home/maxamillion/workspace/qt5_compare/qt-everywhere-src-5.12.2/qtbase/src/android/jar/src/org/qtproject/qt5/android/QtNative.java ./qtbase/src/android/jar/src/org/qtproject/qt5/android/QtNative.java
491a492,495
>             float tiltRot = event.getAxisValue(MotionEvent.AXIS_TILT);
>             float orientation = event.getAxisValue(MotionEvent.AXIS_ORIENTATION);
>             float tiltX = (float) Math.toDegrees(-Math.sin(orientation) * tiltRot);
>             float tiltY = (float) Math.toDegrees(Math.cos(orientation) * tiltRot);
493c497
<                 event.getButtonState(), event.getX(), event.getY(), event.getPressure());
---
>                 event.getButtonState(), event.getX(), event.getY(), event.getPressure(), tiltX, tiltY, (float)Math.toDegrees(orientation));
1025c1029
<     public static native void tabletEvent(int winId, int deviceId, long time, int action, int pointerType, int buttonState, float x, float y, float pressure);
---
>     public static native void tabletEvent(int winId, int deviceId, long time, int action, int pointerType, int buttonState, float x, float y, float pressure, float tiltX, float tiltY, float rotation);
diff -r /home/maxamillion/workspace/qt5_compare/qt-everywhere-src-5.12.2/qtbase/src/plugins/platforms/android/androidjniinput.cpp ./qtbase/src/plugins/platforms/android/androidjniinput.cpp
321c321
<         jint pointerType, jint buttonState, jfloat x, jfloat y, jfloat pressure)
---
>         jint pointerType, jint buttonState, jfloat x, jfloat y, jfloat pressure, jfloat tiltX, jfloat tiltY, jfloat rotation)
364c367
<             buttons, pressure, 0, 0, 0., 0., 0, deviceId, Qt::NoModifier);
---
>             buttons, pressure, tiltX, tiltY, 0., rotation, 0, deviceId, Qt::NoModifier);
869c872
<         {"tabletEvent", "(IIJIIIFFF)V", (void *)tabletEvent},
---
>         {"tabletEvent", "(IIJIIIFFFFFF)V", (void *)tabletEvent},

Thanks for the tilt transform is vary helpful.