On terça-feira, 9 de outubro de 2012 19.53.06, Sorvig Morten wrote: > Thiago: > >On terça-feira, 9 de outubro de 2012 09.46.37, Sorvig Morten wrote: > >> I'm re-defining it to be the size in points. I think this intuitive, you > >> are asking QIcon::pixmap() for pixmap suitable for covering this many > >> units on screen - not for a pixmap of a specific size. > > > > When you write the documentation, please be clear that this is an "Apple's > > dea of point", not what everyone else currently uses (1/72 of an inch). > > Isn't it the same? My code is > > painter->drawPixmap(QRect(0,0,72,72), QIcon::pixmap(72,72));
1 pixel = 1 point if and only if the resolution is 72 dpi. I vaguely recall something about the Mac having a hardcoded DPI setting of 72, which is why the name "point" works. Regular Windows setting is 96 dpi, meaning you need 96 pixels to make an inch, or 4 pixels = 3 points. > I run the code on normal-dpi screen and measure the drawn pixmap with a > ruler. It's one inch across. Then I run the same code on a high-dpi screen > and measure again. It's still one inch across, but filled with more pixels. > > (assuming that the screens have exactly 72 and 144 pixels per inch, > respectively) > > Conclusion: the name is inaccurate. High-ppi (as in pixel) would be better, > since point geometry does not change. Android calls them "device-dependent pixels" (ddp). -- Thiago Macieira - thiago.macieira (AT) intel.com Software Architect - Intel Open Source Technology Center
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