Am 11.02.2014 um 22:43 schrieb VStevenP <vstevenpa...@yahoo.com>:
> Or perhaps the behavior I mentioned below is a feature?
Yes, it's a feature ;)
You want to get familiar with the concept of "points" vs "pixels" (-> check the
Apple developer docs, search for "retina" and the like) and how Qt implements
that.
This is probably a good starting pixe^w point:
https://blog.qt.digia.com/blog/2013/04/25/retina-display-support-for-mac-os-ios-and-x11/
Basically: when you want to draw a rectangle of a given width and height, don't
think in pixels! Think in (device-independent) points instead.
Qt (and in the end Cocoa) will make sure that it has the same physical
dimension on a HiDPI (aka "Retina") and a "normal DPI" screen (which have the
same physical dimension) by fiddling around with the proper "scale" factors (in
the Cocoa/Apple world that scale factor is always exactly 2.0 for Retina
displays).
If it comes to images you usually need to provide two versions of your assets:
a "normal resolution" and a "@2x" resolution.
E.g. a QIcon then properly chooses the right version for you.
When it comes to QPixmaps then you want to read about
QPixmap::setDevicePixelRatio.
When it comes to drawing lines, rectangles and text with QPainter (and QtQuick
2 I assume) then you don't need to bother - Qt/Cocoa does it all for you (as
long as you think in "points", that is).
Sorry, don't know much about QtQuick, but I assume it's all "pretty much the
same logic" there ;)
Cheers,
Oliver
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