On Wednesday 26 March 2014 10:35:05 Graham Labdon wrote: > Hi > My application needs to display a series of 'traces'. > Each trace will consist of 5000+ points and there can be up to 50 traces. > I would be grateful of some pointers on how to do this in the most efficient > way - QPainter on a widget > Use of OpenGL > QGraphicsScene > Which of these will be the most efficient at displaying the data quickly?
OpenGL will almost certainly be the most efficient. How many points/line segments do you expect on screen at any one time? All 5000 points per trace or some subset? e.g a moving window of them. Remember that you will unlikely have 5000 distinct pixels horizontally. How often do your points get updated and in what manner? All of them? Only a subset? In a FIFO manner? The trick to making it work well with OpenGL is to get the data from your CPU into GPU memory efficiently without incurring any implicit synchronisation points. Cheers, Sean -- Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK Klarälvdalens Datakonsult AB, a KDAB Group company Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322) KDAB - Qt Experts - Platform-independent software solutions _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
