On 7 April 2017 at 14:38, Patrick Stinson <patrickk...@gmail.com> wrote: > I am implementing a pan and zoom on pinch via raw touch events and am finding > setTransform() to be very slow, even with an empty scene. The touch events > are backed up in a queue by slow synchronous calls to > QGraphicsView.setTransform().
If it's slow with an empty scene, then you have a problem that has nothing to do with QTransform. Maybe you have a cascade of events that bounce on each other until it stabilise... Maybe your synchronous calls are too frequent. I would advise to use the animation framework to do this sort of things. Whats your environment, which HW, which OS, which Qt, ... > > 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? Use the animation framework. no need for a queue mechanism, should work without any problems unless you hardware is not powerful enough. Chris > > Thanks! > -P > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
