[Interest] Achieving resolution independent font sizes with Qt

Nikos Chantziaras realnc at gmail.com
Sat Jun 8 02:41:51 CEST 2013

On 07/06/13 18:25, Thiago Macieira wrote:
> On sexta-feira, 7 de junho de 2013 16.57.20, Nikos Chantziaras wrote:
>> Is there an approach I can take to make the font sizes in applications
>> independent of the current resolution? [...]
> There's something wrong with your setup. Font sizes *are* resolution
> independent. The definition of "point" is that 72 pt = 1 inch of actual screen
> size.
> Now, most display systems will not update the screen DPI when changing
> resolutions. That is a known issue and please don't expect any changes
> anywhere.

I was afraid it might be something like that.  At least point size on 
Windows 7 does appear to result in the same on-screen size regardless of 
resolution.  It's probably just X.Org that doesn't play nice.

> The question is simply: does the font size look right in the default
> resolution of your setup?

I don't have a ruler handy, but 72pt does appear to roughly correspond 
to somewhere between 2 and 3 cm.  So I'd say it works in the default 
resolution.  And given that the majority of users are most probably 
using LCDs and running them at their native resolution, I guess this is 
less of a problem than I first thought.

In any event, thanks for clarifying this.  I wasn't aware that point 
size is already supposed to be resolution independent.

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