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)


At first I didn't understand a thing about your answer, however after
digging a bit further and finding out that when replacing 14pt with 14.4 pt
( re: \showbodyfontenvironment table ) it works again. Guess I now
understand what "fallbacks"means. :O)

For future reference...
http://en.wikipedia.org/wiki/Typeface
http://en.wikipedia.org/wiki/Fallback_font

Alan



> % \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
>