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 -)
\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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