OK, I checked the Adobe Font Metrics File Format Specification document (available at http://www.wotsit.org, for example) and found the following statement:
==================================================================== 3.2 Units of Measurement
All measurements in AFM, AMFM, and ACF M fi les are given in terms of units equal to 1/1000 of the scale factor (point size) of the font being used. To compute actual sizes in a document (in points; with 72 points = 1 inch), these amounts should be multiplied by ( scale factor of font ) / 1000. ==========================================================================
As far as I can understand, this means that the values should be multiplied by 10/1000 for cmr10, right? Note that the definition of point here is different from what TeX uses 1 inch = 72.27pt, but that should only make a minor difference.
cmr10.afm and other AFM files can be found at CTAN in /fonts/cm/afm/.
I tried to quickly browse through the source code of afm2tfm that's included in teTeX, but couldn't find the relevant parts.
/Mats
Rune Zedeler wrote:
Han-Wen Nienhuys wrote:
IIRC the 1000 in an AFM is relative to either the design size or the
baselineskip of the font. Isn't an em 10pt in cmr10?
I tried to (dirtily) hack afm.cc to multiply the sizes by 10 if the font is CMR10.
It does not give exactly the same results with and without the afm-file.
Unfortunately I made a test file which produces bad results no matter if the cmr afm-files are there or not. The result is worse with the afm-files, but it is also wrong without them :-(
\score {
\notes <
\context Staff \notes { c d e f g a b c' c d e f }
\context Lyrics \lyrics { this is a loooooooooooooooooooooooooong test aaaa }
>
}
the long word overlaps the next word.
Without the afm-files (i.e. on a tetex-system) it is approx "ng" that overlaps, where as with the afm-files, "oong" overlaps.
Can anybody else reproduce this bug?
The bug is also there in 1.6, so 1.8 is not in danger :-)
The font-metrics code really needs an intense look.
-Rune
-- ============================================= Mats Bengtsson Signal Processing Signals, Sensors and Systems Royal Institute of Technology SE-100 44 STOCKHOLM Sweden Phone: (+46) 8 790 8463 Fax: (+46) 8 790 7260 Email: [EMAIL PROTECTED] WWW: http://www.s3.kth.se/~mabe =============================================
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