Hans Hagen schrieb:
> Peter Rolf wrote:
>
>> Hans Hagen schrieb:
>
>>> so, what exactly do you need the number for
>> for overprinting (text only) i have to test if the current color is
>> black. overprinting should be activated for all text elements, but if
>> the print color is non black, overprinting should be disabled.
>
> so, how about something that just works -)
>
build in stuff is always preferred (as i don't have to adapt it if the
environment changes) :)
this looks nice. much better than my low level based and therefore
fragile solution.
many thanks!!
regards, peter
> \setupcolors[state=start]
>
> \startluacode
> function ctx.isblack(ca) -- name might change
> local cv = ca > 0 and colors.value(ca)
> return (cv and cv[2] == 0) or false
> end
> \stopluacode
>
> \def\doifblackelse#1%
> {\ctxlua{commands.doifelse(ctx.isblack(\thecolorattribute{#1}))}}
>
> \def\doifdrawingblackelse
> {\ctxlua{commands.doifelse(ctx.isblack(tex.attribute[attributes.numbers['color']]))}}
>
> \starttext
>
> \definecolor[foo][black]
> {\red red {\foo (\doifblackelse{foo}{YES}{NO}
> \doifdrawingblackelse{YES}{NO}) black} red}
>
> \definecolor[foo][green]
> {\red red {\foo (\doifblackelse{foo}{YES}{NO}
> \doifdrawingblackelse{YES}{NO}) green} red}
>
> \stoptext
>
> less code and more abstract
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
> | www.pragma-pod.nl
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