[Python] gdmodule true type font size
chris.gonnerman at newcenturycomputers.net
Sun Sep 14 06:57:28 CEST 2003
----- Original Message -----
From: "John Hunter" <jdhunter at nitace.bsd.uchicago.edu>
> When using gdmodule to draw text using true
> type fonts
> im.string_ttf(font, fontsize, angle, (x,y), s, color)
> the docs say 'draw string s at (x,y) using the
> TrueType font at the given pointsize and
> angle.' It is not clear to me how gd handles
> point size. A fontsize of 12 should be 12/72 =
> 1/6 inches tall but how does gd decide what an
> inch is? 72 pixels? Is there some scale
> parameter or constant that allows gd to make
> the conversion from pixels to points?
No. The underlying GD library assumes 1 point is
exactly 1 pixel. Font metrics are pretty fuzzy,
so your mileage may vary slightly especially
with script fonts.
> I want my text to scale with image resolution
> which is determined by a dpi parameter, and I
> tried doing
> scale = dpi/72.0
> im.string_ttf(font, scale*fontsize, angle, (x,y), s, color)
> but the fonts are larger than they should be,
> at least according to my calculations.
You've got me here. Perhaps if I knew what you
were trying to accomplish at a bit higher level,
I might be able to make a suggestion.
Chris Gonnerman -- chris.gonnerman at newcenturycomputers.net
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