On 5/5/2014 8:37 PM, Rik Kabel wrote:
On 2014-05-05 11:29, Michael Ash wrote:
... see message 56606 http://www.mail-archive.com/ntg-context%40ntg.nl/msg56606.html in the list archive. This is not the post-simplefonts solution, but the pre-simplefonts solution. It does allow much better control over all of the fonts that make up the typeface (using ConTeXt terminology).
If you set only some Hebrew/Aramaic/Arabic, and especially if you do not need font variants (bold, italic, ...) you might prefer to define a single font.
Thank you very much again. This was helpful, and here is my minimal working example:
\definefontfeature[hebrew][default][script=hebr,ccmp=yes] \definefont [myhebrew] [SILEOTSR.ttf*hebrew] \setupdirections[bidi=on,method=two]
\starttext Here is the first line of the Bible.
{\myhebrew בְּרֵאשִׁ֖ית בָּרָ֣א אֱלֹהִ֑ים אֵ֥ת הַשָּׁמַ֖יִם וְאֵ֥ת הָאָֽרֶץ׃ } \stoptext
I still have some questions. It took me a long time to understand that
\definefont [myhebrew] [SILEOTSR.ttf*hebrew]
would use the fontfeature "hebrew" that I had defined together with the font file SILEOTSR.ttf and assign this pairing to the nickname "myhebrew". Rik's example also has "sa 1" which I do not understand.
\definefontfeature [aramaic] [default][ccmp=yes,script=hebr] \definefont [aramaic] [KeterYG-Medium.ttf*aramaic sa 1]
Is the syntax for definefont using "*" documented somewhere? Is it similar to definefontsynonym at http://wiki.contextgarden.net/Fonts_in_LuaTeX (and below)?
I also do not understand the full syntax from the referenced message. Here is my best effort to annotate it, but I would appreciate corrections or additions
%% The following defines the fontfeature "hebrew" %% which can then be applied to a font. %% definefontfeature is documented at %%http://wiki.contextgarden.net/Command/definefontfeature %% and the available features are specific to the font %% e.g.http://www.microsoft.com/typography/otspec/featurelist.htm \definefontfeature[hebrew][default][script=hebr,ccmp=yes,mark=yes]
%% I am confused below. When was font:fallback:serif defined?
%% Why file: but features= ? %% How will the fontsynonym "Serif" function? \starttypescript [serif] [ezrasil] \setups[font:fallback:serif] \definefontsynonym [Serif] [file:sileot] [features=hebrew] \stoptypescript
%% Still confused \starttypescript [ezrasil] \definetypeface [ezrasil] [rm] [serif] [ezrasil] [default] \quittypescriptscanning \stoptypescript
%% Sets the main body to the font %% that has been named and given features \setupbodyfont[ezrasil] %% Would an alternative at this point be to use %% \definefont [myezrasil] [ezrasil]
%% to define a single font and then use {\myezrasilבְּרֵאשִׁ֖ית}for short passages
\setupalign[r2l]
\starttext בְּרֵאשִׁ֖ית בָּרָ֣א אֱלֹהִ֑ים אֵ֥ת הַשָּׁמַ֖יִם וְאֵ֥ת הָאָֽרֶץ׃ \stoptext
Michael,
Wolfgang already answered most of your questions, at least by the expedient means of teaching a man to fish. However, not all of the questions are answered in the font manuals, and in particular your question about the font fallbacks. (The word setups does not appear in mfonts, and fallback appears once. In the MKIV font manual setups appears once and fallback thrice. None provide your answer.)
Font definition in ConTeXt allows extreme degrees of indirection. There is a lot of flexibility that follows from this. By defining synonyms such as serif and serifbold and using these in the document, the document can be written independently of the actual fonts used. The names are to some degree arbitrary, but used conventionally. There is nothing stopping you from placing a sans font at the end of a chain of serif references.
Setups are at their simplest a way to bundle other commands for reuse. They also provide a namespace mechanism and a mechanism for group setting and resetting of values.
The ConTeXt source file type-fbk.mkiv (and undoubtedly something similar for MKII) defines a set of font name synonyms in a font:fallback: namespace that is useful for gracefully substituting one font for another when required, as when the document calls for a bold italic but the font in use does not have that style. You can leave this out, or define your own fallback hierarchy if you wish.
So, the first part of the typescript above defines ezrasil as a synonym for the serif face and associates it with the file sileot and certain otf features labeled hebrew. The file naming and search mechanism are well described in the manuals. The setups brings in the standard set of substitutions that will be applied when the document calls for serif styles that the specific font does not offer.
The second part of the typescript defines another synonym (confusingly also ezrasil) for the typeface and includes in it only a roman face definition. In a latin script there would likely be another definetypeface for the sans face, another for the mono face, and a fourth for the math face. Setupbodyfont uses the name of a typeface so defined. (You can see that this is a separate synonym by substituting
\starttypescript [bart] \definetypeface [bart] [rm] [serif] [ezrasil] [default] \quittypescriptscanning \stoptypescript \setupbodyfont[bart]
for the similar lines further above.) With a latin face there would have been additional occurrences of the first part of the typescript as well for each of the different face variants.
As to why I have "sa 1" (scale at 1) in the KeterYG definition: This is not needed, but it serves as a reminder that I have evaluated the font and that this scale is okay for me. I find that when I mix fonts, it helps to adjust the sizes. Ezra SIL needs to be scaled to 0.85 or so, but of course that depends on the other fonts in use and one's own taste. (In LaTeX, the fontspec package provides a mechanism to automatically scale fonts to match the x-height or full height of one font to another. The process is manual here.)
context always had (has) the 'rscale' option btw, scaling to the x height or ascender is quite unpredictable: \starttext \definedfont[Serif*default at 10pt] xxXX\par \definedfont[Serif*default sc 10pt] xxXX\par \definedfont[Serif*default ht 10pt] xxXX\par \switchtobodyfont[dejavu] \definedfont[Serif*default at 10pt] xxXX\par \definedfont[Serif*default sc 10pt] xxXX\par \definedfont[Serif*default ht 10pt] xxXX\par \stoptext best is to look at the result: \showfontstrip \showminimalbaseline
I'll step aside now and let those who know better correct me.
-- Rik
___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
-- ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------