It would be really great if you'd stop wasting people's time by not
crossposting.
Cheers, Henri
On 09/04/20, 09:04, Gerben Wierda wrote:
> 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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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
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