On 2/3/2018 10:02 PM, jmm...@us.es wrote:
Hi, I'm starting a presentation with ConTeXt.

I'd like to visually differentiate each section, so I've come up with two complementary approaches to do that:

* Use a different color palette for each section, and
* Mark the progress bar to indicate the start of each section.

I've done an small example (at the end) but:

* Last Subject of a Topic take color from next Topic. (e.g. "Some greenB")
* I don't like interactionBar styles provided.

I'd like something like:

|-----|-|-----|--|------
(horizontal line and a vertical line at the begin of each section and a vertical line of different color for current position)

other option I like:

######%%@@@@@@HHH&&&&&&&
(each letter represents a color. It's a bar with colors marking size of text. So it's a series of color rectangles with colors for each section and a vertical line for current position)

The main problems are:

* How can I pass the first page of each section to MetaPost?

you need to get the logic ok yourself, something like:

\startuseMPgraphic{PageShape}
    StartPage ;
        numeric n ; n := \number\nofsubpages ;
        numeric m ; m := \number\subpageno ;
        if (n > 0) and (m > 0) :
            pair pa ;
            path p ; p := (100pt,100pt) -- (500pt,100pt) ;
            draw p
                withpen pencircle scaled 5pt
                withcolor "BackgroundColor" ;
            for i=0,n-1 :
                pa := point(1/n) of p ;
                draw (pa + (0,10pt)) -- (pa + (0,-10pt))
                    withpen pencircle scaled 5pt
                    withcolor "BackgroundColor" ;
            endfor ;
            draw point (1/m) of p
                withpen pencircle scaled 10pt
                withcolor "PositionColor" ;
       fi ;
    StopPage ;
\stopuseMPgraphic


* How can I protect background color of SomeGreenB to be green and not blue?

just look at the definitions you load ...

\definecolor [MyBackgroundColor] [s=.85]
\setupbackgrounds
  [page]
  [background=color,
   backgroundcolor=MyBackgroundColor]



Thanks.

-------8< ----- Start example


\usemodule[present-original]
\usemodule[present-common]

\definecolor [PageColor]       [black]
\definecolor [BackgroundColor] [s=.85]
\definecolor [OrnamentColor]   [r=.75]
\definecolor [PositionColor]   [s=.55]

\defineoverlay
   [PageShape][\useMPgraphic{PageShape}]

\startuseMPgraphic{PageShape}
     StartPage ;
         path p ; pair pa, pb ; numeric len ; color contrastcolor ;
         numeric i;
         numeric sections[];
         % simulated load of sections
         sections[0] := 1;
         sections[1] := 4;
         sections[2] := 6;

         pickup pencircle scaled 5pt ;
         p := (100pt,100pt)--(500pt,100pt);
         draw p withcolor \MPcolor{OrnamentColor} ;
         contrastcolor = \MPcolor{PositionColor} ;
         if (RealPageNumber > 0) and (NOfPages > 0):
             len := 1/NOfPages ;
             i := 0;
             forever :
               exitunless known sections[i];

               pa := point(0+len*sections[i]) of p ;
              draw (pa+(0,10pt))--(pa+(0,-10pt)) withcolor \MPcolor{OrnamentColor} ;
               i := i + 1;
             endfor ;
             pa := point (0+len*RealPageNumber) of p ;
             %draw (pa+(0,10pt))--(pa+(0,-10pt)) withcolor contrastcolor ;
            draw pa withpen pencircle scaled 10pt withcolor contrastcolor ;
        fi ;
     StopPage ;
\stopuseMPgraphic

\setupbackgrounds
   [text]
   [background={PageShape}]

\starttext

\setupdocument[title={Title},location={Place}]

\startdocument
   \definecolor[BackgroundColor][r=0,g=.7,b=0]
   \startTopic[title={Topic Green}]
     Some text A
     \startSubject[title={Some green 1}]
       more text B
     \stopSubject
     \startSubject[title={Some green 2}]
       more text B
     \stopSubject
   \stopTopic

   \definecolor[BackgroundColor][r=0,g=0,b=0.7]
   \startTopic[title={Topic Blue}]
     Some text C
     \startSubject[title={Some blue}]
       more text D
     \stopSubject
   \stopTopic

   \definecolor[BackgroundColor][r=.7,g=0,b=0]
   \startTopic[title={Topic Red}]
     Some text E
     \startSubject[title={Some Red}]
       more text F
     \stopSubject
   \stopTopic
\stopdocument

\stoptext
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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
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

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