Double-sided layer

Double-sided layer

[Huseyin Özoguz]

Hello context-community,

I have an image as a layer and want it to place on every page of a book 
with some offset.

My minexample:

\setlayer[mybg]
     [hoffset=2cm, voffset=0.2cm, doublesided=yes] {\framed[frame=off, 
width=2cm, 
height=1cm]{\externalfigure[bilder_bearbeitet_png/32.png][width=\textwidth]}} 


That works in principle, but I want the hoffset to be relative to the 
cutspace/backspace: different on right and left page, such that the 
layer is set equally on every page relative to the textbody.

In the example above I use "doublesided=yes", but that has no effect. 
How to achieve proper double-sided behavior?

Thank you.
Huseyin

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Re: Double-sided layer

[Wolfgang Schuster]

Huseyin Özoguz schrieb am 06.05.2021 um 12:48:
> Hello context-community,
> 
> I have an image as a layer and want it to place on every page of a book 
> with some offset.
> 
> My minexample:
> 
> \setlayer[mybg]
>      [hoffset=2cm, voffset=0.2cm, doublesided=yes] {\framed[frame=off, 
> width=2cm, 
> height=1cm]{\externalfigure[bilder_bearbeitet_png/32.png][width=\textwidth]}} 
> 
> 
> That works in principle, but I want the hoffset to be relative to the 
> cutspace/backspace: different on right and left page, such that the 
> layer is set equally on every page relative to the textbody.
> 
> In the example above I use "doublesided=yes", but that has no effect. 
> How to achieve proper double-sided behavior?

You have to set the content for the layer twice, once for
the left pages and a second time for the right pages.

\setuppagenumbering
   [alternative=doublesided]

% \setupexternalfigures
%   [directory=images_bearbeitet_png]

\definelayer
   [backgroundimage]
   [width=\paperwidth,
    height=\paperheight,
    state=repeat,
    doublesided=yes]

\setupbackgrounds
   [page]
   [background=backgroundimage]

\setlayer
   [backgroundimage]
   [right]
   [x=\backspace,
    y=\dimexpr\topspace+\headerheight+\headerdistance\relax]
   {\externalfigure[32.png]}

\setlayer
   [backgroundimage]
   [left]
   [x=\cutspace,
    y=\dimexpr\topspace+\headerheight+\headerdistance\relax]
   {\externalfigure[32.png]}

\showframe [text] [text]

\starttext
\dorecurse{10}{\dontleavehmode\page}
\stoptext

Wolfgang
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