In my experience setting a GL viewport makes everything much less snappy (at least on linux & os x, did not test on windows).
Here is a video of my software with GL viewport: https://vid.me/kjRe And without: https://vid.me/e2vu As you can see (as far as one can see in such a video), when I move the object with the GL viewport there is a visible lag between the position of the cursor and the position of the object ; much less when there is only software rendering. The experience is even worse on macOS, but maybe because of the performance cost of retina. I also tried porting the main view to QtQuick 2 but it is roughly the same "laggy" performance. Best ------- Jean-Michaël Celerier http://www.jcelerier.name On Fri, Apr 7, 2017 at 7:04 AM, Thiago Macieira <thiago.macie...@intel.com> wrote: > Em quinta-feira, 6 de abril de 2017, às 19:38:36 PDT, Patrick Stinson > escreveu: > > Without stripping down my code into a runnable example, is setTransform > > considered to be too slow for 60Hz frame-rate updates from touch events? > If > > so, is there a better way to smoothly zoom and pan the graphics view? > > QGraphicsView is not architected correctly for smooth 60 fps. > > At least try to set a QOpenGLWidget as your viewport. It might help. > > -- > Thiago Macieira - thiago.macieira (AT) intel.com > Software Architect - Intel Open Source Technology Center > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest >
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