[Pharo-dev] [Moose-dev] Re: Re: Re: Fwd: Font problem is still there

Pharo4Stef pharo4Stef at free.fr
Fri Apr 4 02:33:47 EDT 2014


Igor 

I was wondering the following: ? But TextStyle is not about strikefont?

Stef

On 04 Apr 2014, at 02:55, Igor Stasenko <siguctua at gmail.com> wrote:

> Okay, i think i got it..
> 
> Here is what happens:
> - the font size is usually specified in points, not x at y points, but typographical points,
> which is 
> 1/72 inch
> 
> 
> TextStyle pointsToPixels: 14
> 
> TextStyle pointsToPixels: 14 => 18.666666666666668
> 
> pointsToPixels: points
>     ^points * self pixelsPerInch / 72.0
> 
> 
> but in Athens, i , stupid idiot, completely forgot about that, 
> and use point size directly, to scale up font ..
> but the point is that this scaling performed in font units (EMs).
> 
> so, to actually scale font correctly, i must use same TextStyle pointsToPixels: .. 
> as Freetype package using..
> 
> there is one caveat, that if you really want to see exactly , say 16 points sized font on your screen,
> it is not possible without knowing the display resolution - how many pixels in one inch (hence
> #pixelsPerInch ).
> Unfortunately, our VMs don't give us a way to determine DPI of display..
> and so, it is always 96 :/
>  
> pheww....
> 
> fromFreetypeFont: aFont cairoFace: face
> .....
> 
>   -  fontMatrix scaleBy: aFont pointSize.
> 
>  +  fontMatrix scaleBy: (TextStyle pointsToPixels: aFont pointSize).
> 
> problem solved ... (i hope) :)
> 
> -- 
> Best regards,
> Igor Stasenko.





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