Re: Non-standard font alternatives

[Matthew McCabe via ntg-context <ntg-context@ntg.nl>]

> On 13 Dec 2022, at 7:53 pm, Hans Hagen via ntg-context <ntg-context@ntg.nl> wrote:
> 
> On 12/13/2022 9:15 AM, Matthew McCabe via ntg-context wrote:
>> Hi list,
>> I'm looking to import a font with medium and light weights (in this case Roboto) and define font alternatives so one can quickly switch to light text just as one would switch to bold text. There is a stackexchange answer from Wolfgang (https://tex.stackexchange.com/questions/303648/context-font-weights <https://tex.stackexchange.com/questions/303648/context-font-weights>) which details a solution to this problem for ConTeXt MkIV but despite my best efforts I haven't been able to get things to work for me. There is the Roboto typescript example on ConTeXt garden but it isn't exactly what I'm looking for as for the document I'm making I would prefer to be able to treat the font weights as alternatives rather than separate families since I will be switching often.
> take a look at type-imp-plex.mkiv (just remove the \s! in your case)
> 
> basically you define two typefaces: normal and light and then just switch between these, as in:
> 
> at the top of your document you say
> 
> \usebodyfont[plex]       % preloads
> \usebodyfont[plex-light] % preloads
> 
> \setupbodyfont[plex]     % enables main font
> 
> and after that
> 
> {\switchtobodyfont[plex-light] .... }
> 
> will do a consistent switch
> 
> Hans
> 
> 
> -----------------------------------------------------------------
>                                          Hans Hagen | PRAGMA ADE
>              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>       tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
> 
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Thanks for the reply and your help Hans, ok so if I understand correctly the canonical way to integrate light weight font is to define two typefaces. I wrote up a typescript for (Sans) Roboto based on the example typescript from ConTeXt garden using only the Sans variants and it’s working well.

For anyone else looking to do something similar, since the typescript is just a tex file it seems if one places it in one’s local directory it will be accessible when ConTeXt generates the pdf. I saved it as type-imp-roboto.tex in my local directory and used ‘\usebodyfont[roboto]’ and ‘\usebodyfont[roboto-light]’ to preload the fonts as recommended (\usetypescriptfile didn’t seem to be required).

Here is my typescript, for the Sans Roboto font, pretty much picked out of the context garden example typescript for Roboto:

\definefontfeature[robotofeatures][
  mode=node,
  ccmp=yes, % character composition
  liga=yes, tlig=yes, % ligatures
  pnum=yes,
  cpsp=yes, % capital spacing
  kern=yes,
  language=dflt,
  protrusion=quality,
  expansion=quality,
]

\definefontfeature[smallcaps][ % use with \addff
  smcp=yes, % smallcaps
  % c2sc=yes, % caps to smallcaps
]

\starttypescript[sans][roboto,robotosans]
  \definefontsynonym[Roboto-Regular][name:robotoregular]
  \definefontsynonym[Roboto-Black][name:robotoblack]
  \definefontsynonym[Roboto-BlackItalic][name:robotoblackitalic]
  \definefontsynonym[Roboto-Bold][name:robotobold]
  \definefontsynonym[Roboto-BoldItalic][name:robotobolditalic]
  \definefontsynonym[Roboto-Italic][name:robotoitalic]
  \definefontsynonym[Roboto-Light][name:robotolight]
  \definefontsynonym[Roboto-LightItalic][name:robotolightitalic]
  \definefontsynonym[Roboto-Medium][name:robotomedium]
  \definefontsynonym[Roboto-MediumItalic][name:robotomediumitalic]
  \definefontsynonym[Roboto-Italic][name:robotoitalic]
  \definefontsynonym[Roboto-Regular][name:robotoregular]
  \definefontsynonym[Roboto-Thin][name:robotothin]
  \definefontsynonym[Roboto-ThinItalic][name:robotothinitalic]
\stoptypescript

\starttypescript[sans][roboto,robotosans][name]
  \definefontsynonym [SansThin]         [Roboto-Thin]        [features=robotofeatures]
  \definefontsynonym [SansThinItalic]   [Roboto-ThinItalic]  [features=robotofeatures]
  \definefontsynonym [SansThinSlanted]  [Roboto-ThinItalic]  [features=robotofeatures]
  \definefontsynonym [SansLight]        [Roboto-Light]       [features=robotofeatures]
  \definefontsynonym [SansLightItalic]  [Roboto-LightItalic] [features=robotofeatures]
  \definefontsynonym [SansLightSlanted] [Roboto-LightItalic] [features=robotofeatures]
  \definefontsynonym [Sans]             [Roboto-Regular]     [features=robotofeatures]
  \definefontsynonym [SansItalic]       [Roboto-Italic]      [features=robotofeatures]
  \definefontsynonym [SansSlanted]      [Roboto-Italic]      [features=robotofeatures]
  \definefontsynonym [SansCaps]         [Roboto-Regular]     [features={robotofeatures,smallcaps}]
  \definefontsynonym [SansMedium]       [Roboto-Medium]      [features=robotofeatures]
  \definefontsynonym [SansMediumItalic] [Roboto-MediumItalic][features=robotofeatures]
  \definefontsynonym [SansMediumSlanted][Roboto-MediumItalic][features=robotofeatures]
  \definefontsynonym [SansBold]         [Roboto-Bold]        [features=robotofeatures]
  \definefontsynonym [SansBoldItalic]   [Roboto-BoldItalic]  [features=robotofeatures]
  \definefontsynonym [SansBoldSlanted]  [Roboto-BoldItalic]  [features=robotofeatures]
  \definefontsynonym [SansBlack]        [Roboto-Black]       [features=robotofeatures]
  \definefontsynonym [SansBlackItalic]  [Roboto-BlackItalic] [features=robotofeatures]
  \definefontsynonym [SansBlackSlanted] [Roboto-BlackItalic] [features=robotofeatures]
\stoptypescript

\starttypescript[sans][roboto-light][name]
  \definefontsynonym [Sans]             [Roboto-Light]         [features=robotofeatures]
  \definefontsynonym [SansItalic]       [Roboto-LightItalic]   [features=robotofeatures]
  \definefontsynonym [SansSlanted]      [Roboto-LightItalic]   [features=robotofeatures]
  \definefontsynonym [SansCaps]         [Roboto-Light]         [features={robotofeatures,smallcaps}]
  \definefontsynonym [SansBold]         [Roboto-Medium]        [features=robotofeatures]
  \definefontsynonym [SansBoldItalic]   [Roboto-MediumItalic]  [features=robotofeatures]
  \definefontsynonym [SansBoldSlanted]  [Roboto-MediumItalic]  [features=robotofeatures]
\stoptypescript

\starttypescript[sans][roboto-medium][name]
  \definefontsynonym [Sans]             [Roboto-Medium]     [features=robotofeatures]
  \definefontsynonym [SansItalic]       [Roboto-MediumItalic]      [features=robotofeatures]
  \definefontsynonym [SansSlanted]      [Roboto-MediumItalic]      [features=robotofeatures]
  \definefontsynonym [SansCaps]         [Roboto-Medium]     [features={robotofeatures,smallcaps}]
  \definefontsynonym [SansBold]         [Roboto-Black]        [features=robotofeatures]
  \definefontsynonym [SansBoldItalic]   [Roboto-BlackItalic]  [features=robotofeatures]
  \definefontsynonym [SansBoldSlanted]  [Roboto-BlackItalic]  [features=robotofeatures]
\stoptypescript

\starttypescript[roboto]
  \definetypeface [roboto] [ss] [sans]  [roboto] [default]
\stoptypescript

\starttypescript[roboto-light]
  \definetypeface [roboto-light] [ss] [sans]  [roboto-light] [default]
\stoptypescript

\starttypescript[roboto-medium]
  \definetypeface [roboto-medium] [ss] [sans]  [roboto-medium] [default]
\stoptypescript



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