Sounds like a graphics driver issue. Do you have the most recent graphics driver for your system installed?

Yes i do… Updated just a week ago to the newest driver available.

But good remark, i didn’t tell my system configuration. I’m working on Win7 Prof., with an Geforce 8800GTS. Maybe it could be a problem with nvidia-cards, because i tested the program on my notebook, with Win7, equipped with a nvidia 9650M GT, and had the same problem. But i think, other people would have reported the same issue.

I don’t have a system with a similar config. Perhaps someone else here has a similar system and can take a closer look at it for you. However, like you said, I think it would have been seen and reported by now. For the record, can you also report your Qt version?

Sure. I’m using Qt v. 4.7.1 for Windows (VS 2008). It would be nice, if someone could do this. :)
Thanks in advance…

you can run benchmark and check how your driver/gpu card is doing with this free s/w here [ozone3d.net]

Hi chetankjain,

i did the benchmark, but everything seemed to be normal. the score was nearly the score of equal graphic cards. The only thing that differed from, was my gpu-temperature, which was a bit high (~90-100°C, while the others had a temperature around 70°C).

I tested it on several pcs (unfortunately all equipped with nvidia cards, so i could not compare results on ati) – all produced the same output. I reported it to the Qt bug tracker.
For those who are interested: http://bugreports.qt.nokia.com/browse/QTBUG-16043

yes I tried on 2 different systems, and can reproduce the issue… seems like a bug

bug or not bad programming technique

BTW how antialiasing is done in this example?

hm, i don’t think that this occures because of bad programming. I just used the 2D painting example that comes with Qt. I just added a few buttons to enable/disable antialiasing dynamically. Antialiasing is done by calling the QPainter::setRenderHint method with the arguments QPinter::Antialiasing and QPainter::HighQualityAntialiasing.