QLabel on top of a QGLWidget background issue

[high_flyer]

The image displays in the proper place, but the background color of the image is black (incidently the same color as the qglClearColor) instead of clear.

That is because the GL content is not in Qt context, so Qt does not know about it anything, which means, you QLabel can't know which background it should fill - so its black.

Secondly, when I click on the image and replace with a larger image, I can see the image change, but its size does not.

You have to resize the QLabel to flt your image.

[Rayven]

That is because the GL content is not in Qt context, so Qt does not know about it anything, which means, you QLabel can't know which background it should fill - so its black.

Is there anyway to switch the QLabels context to GLs?

[JohannesMunk]

You could use a graphicsscene with a glwidget as viewport. Put your GL calls in the scenes.drawBackground and put your code inbetween painter.beginNativePainting() and painter.endNativePainting().. Add your pixmap as a qgraphicspixmapitem.

Or you draw the pixmap directly to your glwidget instead of using a label. Use QPainter::drawPixmap .. http://doc.qt.nokia.com/latest/qglwi...ing-techniques

HIH

Johannes

[Rayven]

You could use a graphicsscene with a glwidget as viewport. Put your GL calls in the scenes.drawBackground and put your code inbetween painter.beginNativePainting() and painter.endNativePainting().. Add your pixmap as a qgraphicspixmapitem.

Or you draw the pixmap directly to your glwidget instead of using a label. Use QPainter::drawPixmap .. http://doc.qt.nokia.com/latest/qglwi...ing-techniques

I am trying to keep it out of the GL widget if possible for reuseability, but if I cannot I will probably go the QGraphicsView route. Is there any benefit to putting the GL calls in drawBackground vs. paintEvent in QGraphicsView?

[JohannesMunk]

As the view is conceptually only the display of the scene which contains the content, you would break that concept, if you put content into the view.

As you want your item to be on top of your other gl stuff, I though the background would be appropriate for it.

Joh