Hi,

I just filed this bug in Qt 5.5 and was wondering whether anyone of you encountered this bug as well. And if so, do you know any workaround? It's really frustrating to not be able to draw smooth lines in the Application I'm developing right now.

Tom

Not yet -- I've only built Krita against 5.5 on Linux, and I'm focussing on the opengl canvas first. But since we use Qt's tablet stuff, not our own, on OSX I really appreciate the heads-up!

If by opengl canvas you mean QOpenGLWidget, it is even worse. The frequency goes down to about 60Hz, which is equivalent to a simple mouse. I have no clue why that is. I'm currently installing Yosemite on another Mac to rule out the possibility of my Mac being the culprit.

Edit: It's confirmed, even on a fresh Installation of Yosemite on a different mac, the bug is still there.

Yes... Though on Qt4 we've got other problems on OSX; QGLWidget apparently doesn't handle tablet events at all... People have to disable opengl to get pressure to work.

Hm, after checking the bug report, I'm pretty sure Krita won't be affected. We don't call update from the tablet event: we grab the event, push the stroke calculation to a different thread and run update separately as well.