how do I rotate text about an arbitrary point?

[PsylumDan]

The image is the start of a compass display. It's also my first step into drawing on a QPainter.
The line works fine. It rotates around the center of the image. I would like the text to rotate around the center point as well. As it is, the text is rotating around 0, 0 (upper left corner). The forum won't let me attach the zipped project so here is my paintEvent code. This is a subclass of a QLabel.

void AZ_Label::paintEvent(QPaintEvent *ev)
{
    Q_UNUSED(ev);
    QPainter p(this);
    p.setPen(QPen(Qt::white, 2));
    p.rotate(lineAngle);
    p.save();
    p.translate(translateX, translateY);
    p.drawText(50, 50, "North");
    p.restore();
    p.rotate(-lineAngle);
    p.drawEllipse(xPosition, yPosition, cSize, cSize);
    line.setAngle(qreal(lineAngle));
    p.drawLine(line);
    emit sigSizechanged(xPosition, yPosition, cSize);
}

translateX and translateY are set from a slider on the main window.

[JonB]

@PsylumDan
Does https://stackoverflow.com/questions/31760995/how-to-set-transform-origin-for-qpainter-in-qt, https://stackoverflow.com/a/46180679 address your issue?

[PsylumDan]

@JonB said in how do I rotate text about an arbitrary point?:

@PsylumDan
Does https://stackoverflow.com/questions/31760995/how-to-set-transform-origin-for-qpainter-in-qt, https://stackoverflow.com/a/46180679 address your issue?

Thanks for the reply but no. The line works as expected. It's the text that I'm having trouble with.

[mrjj]

Hi
Qt is not "holding" the text in its center.
You have to calculate the center.
Please try code here.
https://stackoverflow.com/questions/40300346/qt-rotating-text-around-its-center-point

[PsylumDan]

@mrjj said in how do I rotate text about an arbitrary point?:

Hi
Qt is not "holding" the text in its center.
You have to calculate the center.
Please try code here.
https://stackoverflow.com/questions/40300346/qt-rotating-text-around-its-center-point

That's exactly what I needed. Thanks!