On Fri, 12 Oct 2012 10:10:59 +0000, Bache-Wiig Jens wrote: > True. There are certainly plenty of valid use cases out there and some > of those would require a minor change in Qt5 if we go ahead with this > change.
Basically it is about if you want to have a pen width in model or paint device coordinates. Both use cases exist and IMHO none of them is more important than the other. > Most likely no more than setRenderHint(Qt::CosmeticDefaultPen, > true). As long as you don't eliminate this flag I agree for Qwt. But I would have to write a lot of documentation, that pens set from the application code will be handled in Qwt differently than the user is used from other parts of the application. > In fact all non-0 values for pen > width are non-cosmetic by default so making only the default constructor > a special case with a cosmetic pen of size 1 is arbitrary and confusing > regardless if you are using a cosmetic pen or not in your application. Yes it is and I've seen several situations where this leaded to irritations - but this is how it is like many versions of Qt. If it were about introducing a new API I would completely agree, but your suggestion breaks many applications doing graphics. And worst of all it is about introducing a type of bug QA departments usually never finds ( not very likely than someone loads and zooms the exported PDF document in a PDF viewer ). Uwe By the way: in earlier versions of Qt ( didn't test it myself quite some time ) drawing with a pen width of 0 was faster than using a pen of 1 - even if it had the same result. In case of drawing a curve with many lines it was a significant effect. I never spent time on further explorations, but if it is still this way and the cosmetic attribute was the reason you might introduce a performance issues with changing the default setting as well. _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
