Re: Set background color for a single page

[Aditya Mahajan <adityam@umich.edu>]

> Aditya, I want to know both please. Now I use the \start \definecolor 
> ...  ...  \startmakeup[standard] ...  \stopmakeup \stopto assign a 
> specific color to the tilepage whose content is on a single page 
> exactly. But I don't know how to set the background for a single page, 
> say, page 3 if a document has more than three pages. Also, I don't know 
> how to cycle pages through a finite list of colors. Can you show me 
> that? Tim

One way to do this is to set

\setupbackgrounds[page][background=color, backgroundcolor=\PageColor]

and define \PageColor such that it expands to an appropriate color. For 
arbitrary control, you can use a lua function, for example:

\startluacode
   thirddata = thirddata or {}

   function thirddata.getpagecolor(num)
     -- A lua function that assigns colors based on page numbers
     if num == 3 then
        context("blue")
     elseif num == 5 then
        context("red")
     end
   end
\stopluacode

\def\PageColor%
   {\ctxlua{thirddata.getpagecolor(\rawcountervalue[userpage])}}

\setupbackgrounds[page][background=color, backgroundcolor=\PageColor]

\setuppapersize[S3]
\starttext

\dorecurse{10}{\input knuth \par}

\stoptext

You can also use a lua table to assign colors, and then you do not have to 
build a ladder of if statements.

Aditya
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