Bill: I really think it depends on your use-case.
In my application I need to draw a bunch of lines (on the order of hundreds) in a viewer-like tool and I use a QGraphicsView with anitaliasing. Works and looks great - even when zooming in and out dramatically. I did spend some time profiling my custom items to make sure they weren't doing anything unnecessary. When I tried to use an OpenGL-backed QGraphicsView - which you can do with setViewport( new QOpenGLWidget ) - I just couldn't get it to look as clean. Granted I didn't spend too much time on that path because what I have works for me. Not sure if that helps, but it might give you some ideas. --- Andy Maloney // https://asmaloney.com twitter ~ @asmaloney <https://twitter.com/asmaloney> On Fri, Mar 24, 2017 at 6:38 AM, william.croc...@analog.com < william.croc...@analog.com> wrote: > Hello: > > I am still hoping for some insight. > > What does it take to efficiently draw a good looking, anti-aliased line? > Do I have to buy in to the use of OpenGL? > I am just drawing lines. > > Thanks. > > Bill > (The man who *is* who he appears to be. > Apparently that is not as easy as you might think.) > > > On 03/16/2017 08:15 AM, william.croc...@analog.com wrote: > >> [This sender failed our fraud detection checks and may not be who they >> appear to >> be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing] >> >> Hello: >> >> I am slowly porting my app forward from Qt 4.8.6 >> >> With 4.8.6, it is my observation that simple line drawings, >> as made by a QPainter and with Antialiasing enabled in render hints, >> are implemented in software which makes them quite slow. >> >> What can I look forward to if I port my app to 5.X (5.7) >> Is there an option for hardware acceleration >> of AA line drawing and how would I enable it. >> >> I develop on RedHat Enterprise Linux 6.8 >> >> Thanks. >> >> Bill >> _______________________________________________ >> 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 >
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