[Interest] DPI

igor.mironchik at gmail.com igor.mironchik at gmail.com
Sun Feb 23 13:24:54 CET 2014


I want to determine how much pixels in 10 mm.

I use the next calculations:

static const qreal fingerSize = 0.0393700787 * 10;

static const qreal h = (qreal) QApplication::desktop()->physicalDpiY() * fingerSize; 

And this calculations return to me 28 that on my desktop is 5 mm only.

0.0393700787 is how  much inches in millimeter...

What am I doing wrong?

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