[Qt-interest] Drawing text over a QGLWidget

[Donal O'Connor]

After you've everything in your scene rendered in the paintGL method, you
should call renderText.

eg:

renderText(-20.0,-20.0,0.0,QString("Hi There"), QFont("Arial", 20, 5,
false));

and then to stop flickering,

place following lines after before end method:

swapBuffers();
glFlush();

On Wed, Jan 27, 2010 at 4:43 PM, Alan Norton <alan at ucar.edu> wrote:

> I would like to draw text at specified coordinates over an image
> rendered in a QGLWidget.  This is in QT4.6.
> I want the text and the image to be visible at the same time.
> I tried using QPainter::drawText() in the paintGL() method, and in the
> PaintEvent() method.  In the first case, the entire GL scene was
> overwritten.  In the second case, the painting never stops, flickering
> all the time.  Surely there is a "right" way to do this, but I couldn't
> see any examples of this.  Any ideas are welcome.
> Thanks,
> -Alan Norton
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