Re: plot curve range
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From: Uwe R. <Uwe...@ti...> - 2008-11-29 10:13:36
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On Friday 28 November 2008 23:01, Chad Bohannan wrote: > I would like to know when multiple curves are supported with this > performance improvement. The performance of the incremental draw on Mac > OSX version of QPainter has been painfully slow (roughly 45x longer than > windows or linux), and I suspect that fewer begin/end calls will be > effective in getting more usable drawing speeds. Well, I don't have a Mac myself, but AFAIR there is no incremental painting in this environment at all. Isn't the reason for the bad performance, that each paint operation on a widget ends up in a complete repaint ? That's why I wouldn't expect much effect of this change on the Mac, but I might be wrong. What happens if you compare the performance of the realtime example between 5.1.1 and 5.1 from SVN trunk on the Mac ? Uwe |