Nobody?
> On 8 Apr 2020, at 12:20, Gerben Wierda <gerben.wie...@rna.nl> wrote:
>
> I would like to use the result of transparent() straight in my macros, so I
> can pass the colors with transparency using a single parameter. That should
> be possible if I understand the MetaFun manual (where I’ve copy-pasted this
> example from):
>
> \starttext
> \startMPpage[instance=doublefun]
>
> vardef SampleText (expr t, c) =
> save p ; picture p ;
> p := image (draw t infont "\truefontname{Regular}") ;
> draw (p shifted (- xpart center p,0)) scaled 5 withcolor c;
> enddef ;
> SampleText ("Much Of This" , transparent(1, .5, red )) ;
> SampleText ("Functionality" , transparent(1, .5, green)) ;
> SampleText ("Was Written" , transparent(1, .5, blue )) ;
> SampleText ("While Listening", transparent(1, .5, cmyk(1,0,0,0))) ;
> SampleText ("To the CD's Of" , transparent(1, .5, cmyk(0,1,0,0))) ;
> SampleText ("Tori Amos" , transparent(1, .5, cmyk(0,0,1,0))) ;
>
> \stopMPpage
> \stoptext
>
> But it results in:
>
> system > files > jobname 'testcolor', input './testcolor', result
> 'testcolor'
> fonts > latin modern fonts are not preloaded
> languages > language 'en' is active
> open source > level 2, order 3, name './testcolor.tex'
> fonts > preloading latin modern fonts (second stage)
> fonts > 'fallback modern-designsize rm 12pt' is loaded
> metapost > initializing instance 'doublefun:1' using format 'metafun'
> and method 'double'
> metapost > loading 'metafun' as
> '/usr/local/context-osx-64/tex/texmf-context/metapost/context/base/mpiv/metafun.mpxl'
> using method 'double'
> metapost > initializing number mode 'double'
> metapost log >
> metapost log > loading metafun, including plain.mp version 1.004 for
> metafun iv and xl
> metapost log >
> metapost log > ! Missing ')' has been inserted.
> metapost log > <to be read again>
> metapost log > withprescript
> metapost log > transparent->(1)withprescript
> metapost log >
> "tr_alternative="&decimal.transparency_alternat...
> metapost log > <*> ... ("Much Of This" , transparent(1, .5, red )
> metapost log > ) ;
> SampleText ("Functiona...
> metapost log >
> backend > xmp > using file
> '/usr/local/context-osx-64/tex/texmf-context/tex/context/base/mkiv/lpdf-pdx.xml'
> pages > flushing realpage 1, userpage 1, subpage 1
> close source > level 2, order 3, name './testcolor.tex'
> close source > level 1, order 3, name 'cont-yes.mkiv'
>
> For me, it is not about passing colour on to ConTeXt to typeset text, these
> are colors that normally would be drawn with “withcolor ca withtransparency
> (method,factor)” but that requires the passing of many more parameters and a
> lot more work in coding.
>
> Does transparent() maybe produce a string that looks like “ca
> withtransparency (method,factor)” so something only usable in draw/fill/etc
> statements? But in that case how does that work without scantokens to parse
> the string?
>
> Is there a way I can do this without having twice the parameters (and I have
> to pass multiple colours) in my macros everywhere?
>
> Thanks,
>
> G
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