On 03/26/2014 06:35 AM, 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? >
Create trace abstracts (with reduced point counts) for the purposes of drawing. In the extreme case, if a trace is close enough to a straight line (given the resolution of the display) the trace could be abstracted as 2 points. Your cache of abstractions probably needs to depend on your zoom level. This works for me and I have traces with millions of points. I also capitalize on the fact that my traces are (thankfully) monotonic in the X coordinate. > Thanks for your time > _______________________________________________ > 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
