Re: [NTG-context] Strange interaction between textcolor and backgrounds in mkii

20 Mar 2009


      On Fri, 20 Mar 2009, Hans Hagen wrote:
...
Aditya Mahajan wrote:
...
Hi Hans,
Something has changed recently with the mkii color model, due to which page 
backgrounds do not change. (I am guessing that this is a grouping issue, 
but then colors are like a black box to me). Consider the following example
\setuppapersize[S6][S6]
\setupcolors[state=start]
\definecolor [simpleslidestextcolor][s=0]
\setupcolors[textcolor=simpleslidestextcolor]
\startuseMPgraphic{simpleslides:MP:horizontal}
StartPage ;
fill Page withcolor 0.5white ;
StopPage ;
\stopuseMPgraphic
\defineoverlay
  [simpleslides:background:title]
  [\useMPgraphic{simpleslides:MP:horizontal}]
\starttext
test \page
\setupbackgrounds[page][background={simpleslides:background:title}]
test again
\stoptext
In MKII, the background of the second page does not change. This used to 
work until a few months ago (around Dec, 2008) but stopped working after 
that. (It does not work in the Jan 18 version that I have).
In MKIV, this works fine.
this is one of those messy areas where no robust solution is possible
the same can happen with header and footers and such (it does not happen with 
color in mkiv because we use attributes)
I wonder, if we add \page here we might solve this kind of problems but it 
might also have other side effects ... let's do it for a while (i probably 
need to move some code)
\def\stoptext
 {\global\advance\textlevel\minusone
  \ifnum\textlevel>\zerocount \else
    \page % new, flushes headers, colors etc etc etc
    \the\everystoptext
    \expandafter\finalend
  \fi}
Thanks. This works in the bigger examples that I have.

Aditya