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Re: Doc addition - make-pango-font-tree
From: |
Han-Wen Nienhuys |
Subject: |
Re: Doc addition - make-pango-font-tree |
Date: |
Thu, 7 Feb 2008 12:50:07 -0200 |
2008/2/7, Mats Bengtsson <address@hidden>:
> Keeping the description at a cookbook level, as you propose, is one
> alternative.
> Another alternative is to describe more clearly what the different
> parameters
> actually mean.
So, the e-mail message that Risto cites is a bit on the obtuse side, IMO.
The mechanism is as follows:
- make-pango-font-tree has a 'factor' argument, which is a scaling factor. For
a value of 1.0, it sets up fonts at size 12.0 pt.
- the set-global-staff-size calls make-pango-font-tree implicitly,
such that 20pt corresponds to a factor of 1.0 (text of 12.0pt)
- if you want to create your own font-tree, you need to pass a
scaling factor, which would be computed as staff-size-in-points/20
- the myStaffSize was an attempt at explaining this.
> Also, do we really need this silly scaling by 20 for the last parameter?
> Even better, couldn't we get rid of that parameters completely, and make a
> function that figures out the staff size setting in the current module?
This is a good idea. Have a look at the function
layout-set-absolute-staff-size-in-module
font.scm; it's a bit tricky because there are various conversions
between internal coordinates (in mm, last time I looked) and user
visible coordinates (in pt, for fonts).
--
Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen