[Interest] Qwt and upgrading to Qt 5

[K. Frank]

Hi Uwe!

Thank you for the detailed reply.

On Fri, Mar 22, 2013 at 10:34 AM, Uwe Rathmann <Uwe.Rathmann at tigertal.de> wrote:
> On 03/21/2013 11:49 PM, K. Frank wrote:
>
>> I am considering upgrading to Qt 5 (from Qt 4), but I also use qwt, and I am
>> wondering whether I should expect any significant issues doing so.
>
> On X11 you will see performance regressions as the X11 paint engine ( =
> hardware accelerated rendering ) is gone. When working with remote
> desktops Qt5 is almost a no-go.

I'm not using X11 at the moment, so it doesn't matter much to me,
but this sounds like a significant issue.

> On QWS you might also run into regressions, but on all other platforms
> Qt5/Widgets is more or less the same - meaning that you won't have many
> problems ( and not much to win ).
>
>> How does qwt (version 6, presumably) work with Qt 5?
>
> For Qt 5 you need Qwt 6.1. If upgrading from Qwt 6.0 to Qwt 6.1 makes
> sense for you depends on your requirements. But in general it can be
> said, that here are many, many new features and maybe a couple of
> interesting performance related hacks.
>
> APIs have been changed, but differences between Qwt 6.0 and Qwt 6.1 are
> by far less than between Qwt 5.2 and Qwt 6.0.

That's good to know.  I've already upgraded to Qwt 6.0, so I'll plan on
taking the smaller step to 6.1.

> Uwe

Thanks for your advice.


K. Frank