I just made a strange observation in the output pdf of the attached layer_set.tex, which is that when opening it with a pdf viewer like skim or macos preview and showing miniatures, all pages except the last one show page number 1 (the last showing page number 2). 

Which was not the case with the output pdf of the attached multipage_metapost_mwe-very_simple.tex. 

How can I change my code to have proper consecutive page numbering in a pdf viewer?
> On Feb. 17 2024, at 11:03 am, Emanuel Han via ntg-context <ntg-context@ntg.nl> wrote:
> I think I could solve all the problems. Attached the finalized working example. I created the https://wiki.contextgarden.net/MetaPost#Layer_sets_as_individual_pages entry with it. Feel free to modify.
> 
> Cheers
> Emanuel
> 
> On Feb. 16 2024, at 7:56 am, Mikael Sundqvist <mickep@gmail.com> wrote:
> Hi,
> 
> not sure I get what you are missing. But you can try
> 
> setbounds currentpicture to (fullsquare scaled 200) ;
> 
> in base. And then do
> 
> \dorecurse{5}{
> \startTEXpage[offset=1DK]
> \useMPgraphic{layerset#1}
> \stopTEXpage
> }
> 
> if that is the looping you are after.
> 
> /Mikael
> 
> On Fri, Feb 16, 2024 at 6:54 AM Emanuel Han via ntg-context
> <ntg-context@ntg.nl> wrote:
> >
> > Resp. the solution should be such that each generated PDF page has the same dimension, the same background colour and a page number and the metapost content on each page has the same scaling factor.
> >
> > On Feb. 15 2024, at 11:10 pm, Emanuel Han via ntg-context <ntg-context@ntg.nl> wrote:
> >
> > Dear Mikael,
> >
> > I actually need to keep the \dorecurse mechanism of the mwe (from line 44 on), because I need the "setbounds currentpicture to TheFrame" and also because I need page numbering inside the MPpage, as done with draw textext(decimal(currentime)).
> >
> > So, how can I use the \useMPgraphic{layerset1} etc. inside the \dorecurse, assuming I name my layersets "layerset1", "layerset2", "layerset3" etc.?
> >
> > Emanuel
> >
> > On Feb. 15 2024, at 10:07 pm, Emanuel Han via ntg-context <ntg-context@ntg.nl> wrote:
> >
> > Dear Mikael,
> > thanks a lot!
> > this seems to be the solution! And it looks beatiful enough to me 😄
> > I'll try to port all my layers to this new method and see if I run into new problems again 😅
> >
> > Emanuel
> >
> >
> > On Feb. 15 2024, at 8:19 am, Mikael Sundqvist <mickep@gmail.com> wrote:
> >
> > Hi
> >
> > On Thu, Feb 15, 2024 at 1:03 AM Emanuel Han via ntg-context
> > <ntg-context@ntg.nl> wrote:
> > >
> > > Dear list,
> > >
> > > the attached .tex file is the minimal working example we discussed today in the online meeting.
> > >
> > > I realized that the approach of looping through k of p[k] is not fitting my needs, because it's not flexible enough.
> > >
> > > I need another approach, one which works with layer sets.
> > >
> > > I would stop using p as an array, because with the layer sets approach we don't have a fixed order of the layers.
> > >
> > > So the definition of the layers would be something like
> > >
> > > picture layerA;
> > > layerA:=image(
> > > label("Word 1", z1);
> > > );
> > >
> > > picture layerW;
> > > layerW:=image(
> > > label("Mot 2", z2);
> > > );
> > >
> > > picture layerM;
> > > layerM:=image(
> > > label("Parola 3", z3);
> > > );
> > >
> > > picture layerC;
> > > layerC:=image(
> > > label("Wort 4", z3+z1);
> > > );
> > >
> > > picture layerY;
> > > layerY:=image(
> > > label("Nummer 5", z2+z3);
> > > );
> > >
> > > picture layerU;
> > > layerU:=image(
> > > label("number 6", z2+z1);
> > > );
> > >
> > > After that, I would define layer sets and layer subsets. This will be done manually for each layer set and each layer subset.
> > > I don't know the proper syntax to do that. Let's assume we could use a variable type called "myset".
> > >
> > > myset layersubsetGamma;
> > > layersubsetGamma:={layerU,layerM};
> > >
> > > In my logic, the layers will be drawn in the order of their appearance within the {}. In the example, drawn content of layerM might cover drawn content of layerU.
> > >
> > > Contrary to a layer subset, each layer set will result in a PDF page, and thus the layer sets are related to each other by an inner order. That's why I would use an array variable here with [].
> > >
> > > I don't know how to append a set. In the following example, I assumed there would be a function myappend(<initial set>, <the things what the initial set should be appended with>)
> > >
> > > myset layerset[];
> > > layerset1 := {layerW,layerA};
> > > layerset2 := myappend{layerset1, layerY};
> > > layerset3 := myappend{layerset2, layersubsetGamma};
> > > layerset4 := myappend{layerset2, layerU};
> > > layerset5 := myappend{layerset4, layersubsetGamma};
> > >
> > > Finally, I would need each layerset[k] typeset on its own pdf page. And of course on each page k, only the layers which appear in the definition of the layerset[k] should be drawn on top of each other in the order as they appear in that definition.
> > >
> > > I'm very curious to hear your suggestions.
> > >
> >
> > Not beautiful, perhaps, but maybe something like this could work? I
> > think there is no way out of doing some manual work to tell what you
> > want included on each page.
> >
> > \startuseMPgraphic{base}
> > z1 = origin ;
> > z2 = (10,50) ;
> > z3 = (40,30) ;
> >
> > picture layerA;
> > layerA:=image(
> > label("Word 1", z1);
> > );
> >
> > picture layerW;
> > layerW:=image(
> > label("Mot 2", z2);
> > );
> >
> > picture layerM;
> > layerM:=image(
> > label("Parola 3", z3);
> > );
> >
> > picture layerC;
> > layerC:=image(
> > label("Wort 4", z3+z1);
> > );
> >
> > picture layerY;
> > layerY:=image(
> > label("Nummer 5", z2+z3);
> > );
> >
> > picture layerU;
> > layerU:=image(
> > label("number 6", z2+z1);
> > );
> > \stopuseMPgraphic
> >
> > \startuseMPgraphic{Gamma}
> > draw layerU ;
> > draw layerM ;
> > \stopuseMPgraphic
> >
> > \startuseMPgraphic{layerset1}
> > \includeMPgraphic{base}
> > draw layerW ;
> > draw layerA ;
> > \stopuseMPgraphic
> >
> > \startuseMPgraphic{layerset2}
> > \includeMPgraphic{layerset1} ;
> > draw layerY ;
> > \stopuseMPgraphic
> >
> > \startuseMPgraphic{layerset3}
> > \includeMPgraphic{layerset2} ;
> > \includeMPgraphic{Gamma} ;
> > \stopuseMPgraphic
> >
> >
> > \startuseMPgraphic{layerset4}
> > \includeMPgraphic{layerset2} ;
> > draw layerU ;
> > \stopuseMPgraphic
> >
> > \startuseMPgraphic{layerset5}
> > \includeMPgraphic{layerset4} ;
> > \includeMPgraphic{Gamma} ;
> > \stopuseMPgraphic
> >
> > \starttext
> >
> > \startTEXpage[offset=1DK]
> > \useMPgraphic{layerset1}
> > \stopTEXpage
> >
> > \startTEXpage[offset=1DK]
> > \useMPgraphic{layerset2}
> > \stopTEXpage
> >
> > \startTEXpage[offset=1DK]
> > \useMPgraphic{layerset3}
> > \stopTEXpage
> >
> > \startTEXpage[offset=1DK]
> > \useMPgraphic{layerset4}
> > \stopTEXpage
> >
> > \startTEXpage[offset=1DK]
> > \useMPgraphic{layerset5}
> > \stopTEXpage
> >
> > \stoptext
> >
> > /Mikael
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> > archive : https://github.com/contextgarden/context
> > wiki : https://wiki.contextgarden.net
> > ___________________________________________________________________________________
> >
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> > archive : https://github.com/contextgarden/context
> > wiki : https://wiki.contextgarden.net
> > ___________________________________________________________________________________
> >
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> > archive : https://github.com/contextgarden/context
> > wiki : https://wiki.contextgarden.net
> > ___________________________________________________________________________________
> >
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> > archive : https://github.com/contextgarden/context
> > wiki : https://wiki.contextgarden.net
> > ___________________________________________________________________________________
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> archive : https://github.com/contextgarden/context
> wiki : https://wiki.contextgarden.net
> ___________________________________________________________________________________
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
> webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror)
> archive : https://github.com/contextgarden/context
> wiki : https://wiki.contextgarden.net
> ___________________________________________________________________________________