> From: 梁伟钟 [l...@xdt-inc.com] > Sent: Thursday, January 23, 2014 10:05 > Subject: [Interest] curve’s width in inch on different displays > > Hello, I would like to set curve's width in inch and make sure it shows the > same size on different > displays with different resolutions. How to do it ? Please help ,it's > important. Thanks!
Qt reports a screen's dpi value: http://qt-project.org/doc/qt-5/qscreen.html#logicalDotsPerInch-prop ...on Qt4, use something like QApplication::desktop()->physicalDpiX() Then just do: curveWidthInPixels = curveWidthInInch * dpi (This will of course only be precise if the platform reports the correct dpi to Qt) _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
