Strange interaction between textcolor and backgrounds in mkii

Strange interaction between textcolor and backgrounds in mkii

[Aditya Mahajan]

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.

Aditya
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Re: Strange interaction between textcolor and backgrounds in mkii

[Hans Hagen]

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}


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : https://foundry.supelec.fr/projects/contextrev/
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___________________________________________________________________________________

Re: Strange interaction between textcolor and backgrounds in mkii

[Aditya Mahajan]

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
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________