Thanks Hans.

This works, except...

\usetypescriptfile[tps_timesnewroman]
\usetypescript[timesnewroman]

\usetypescriptfile[tps_verdana]
\usetypescript[verdana]

\def\myBodyFontSize{14pt}
\def\myHeadFontSize{14pt}

\setupbodyfont[verdana,\myBodyFontSize]
\setuphead[chapter][style={\switchtobodyfont[timesnewroman,\myHeadFontSize]}]

\starttext
\chapter{First Chapter}
\input knuth
\stoptext

(1) with for example

- bodyfont = verdana, head font = timesnewroman (or the reverse)
 bodyfont size = 12pt, headfont size 12 pt => pdf is fine
bodyfont size = 13pt, headfont size 13 pt => chapter head is blank
 bodyfont size = 14pt, headfont size 14 pt => chapter head is blank

(2) what to use instead of \definetypeface[myFont][...] to be able to write
\setupbodyfont[myFont,...] and/or \switchtobodyfont[myFont,...] ?

Alan

On Thu, Feb 19, 2009 at 10:36 PM, Hans Hagen <pragma@wxs.nl> wrote:

> Alan Stone wrote:
>
>> Hi,
>>
>> BF = body font
>> HF = head font
>>
>> A = arial
>> T = times new roman
>> V = verdana
>>
>> OT = 12 = 12pt
>> OF = 14 = 14pt
>>
>> See comments in fontswitch.tex
>>
>> In attachment...
>>
>> - fontswitch.tex: minimal example
>> - tps_arial.tex, tps_timesnewroman.tex, tps_verdana.tex: typescripts
>> - fontswitch.log for BFT14 + HFV14 -> font error ( same with BFA14 + HFV14
>> )
>> - fontswitch.pdf for BFT14 + HFV14 : chapter head is blank ( same with
>> BFA14
>> + HFV14 )
>>
>> After testing different font(switching) combinations...
>>
>> - BFA14 or BFT14 + HFVx with x not 14pt compile and print the generated
>> pdf
>> fine
>> - BFV14 + HFV14 compiles and prints the generated pdf fine
>> - BFA12, BFT12, BFV12 + HFV14 or HFV12 compile and print the generated pdf
>> fine
>>
>> Qué passa ?
>>
>
> you use undefined typefaces; in mkii we default to an empty fontclass which
> in turn will trigger default fallbacks (i.e. the main bodyfont has no
> fontclass) while in mkiv we default to the 'modern' fontclass; i'm still not
> sure if it will be kept this way but if so, i'll make a fallback again (this
> time to a default fontclass)
>
> % \usetypescriptfile[tps_arial]         \usetypescript[arial]
> \usetypescriptfile[tps_timesnewroman] \usetypescript[timesnewroman]
> \usetypescriptfile[tps_verdana]       \usetypescript[verdana]
>
> \def\myFontSizeOT{12pt}
> \def\myFontSizeOF{19pt}
>
> % \setupbodyfont[arial,        \myFontSizeOT]
> % \setupbodyfont[timesnewroman,\myFontSizeOT]
> \setupbodyfont[verdana,      \myFontSizeOT]
>
> % \setupbodyfont[arial,        \myFontSizeOF]
> % \setupbodyfont[timesnewroman,\myFontSizeOF]
> % \setupbodyfont[verdana,      \myFontSizeOF]
>
> % \setuphead[chapter][style={\switchtobodyfont[arial,\myFontSizeOT]}]
> %
> \setuphead[chapter][style={\switchtobodyfont[timesnewroman,\myFontSizeOT]}]
> % \setuphead[chapter][style={\switchtobodyfont[verdana,\myFontSizeOT]}]
>
> \setuphead[chapter][style={\switchtobodyfont[arial,\myFontSizeOF]}]
> %
> \setuphead[chapter][style={\switchtobodyfont[timesnewroman,\myFontSizeOF]}]
> % \setuphead[chapter][style={\switchtobodyfont[verdana,\myFontSizeOF]}]
>
> \starttext
>
> \chapter{First Chapter}
>
> \input knuth
>
>
> -----------------------------------------------------------------
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-- 
Alan