Re: help - spine centered figure

[h h extern <pragma@wxs.nl>]

Ciro A. Soto wrote:

> I am hoping to get the version 1.  The other version
> is like an exercise for me, to see how it would be
> done.

well, the machinery is there, and there are several solutions, of which i show 
only one (watch further on how we enable clipping);

don't forget to submit this example to the wiki

\definelayer
   [page]
   [width=\paperwidth,
    height=\paperheight,
    offset=-\measure{page-bleed},
    doublesided=yes]

\setupbackgrounds
   [page]
   [background=page]

\setuppagenumbering
   [alternative=doublesided]

\definemeasure [page-bleed] [\dimexpr(10mm)]

\useexternalfigure
   [page-graphic]
   [cow]
   [ width=\dimexpr(2\paperwidth +2\measure{page-bleed}),
    height=\dimexpr( \paperheight+2\measure{page-bleed})]

\starttext

% cleaner here

\startstandardmakeup[doublesized=no,page={empty,left}]
     \setlayer
       [page] [preset=lefttop]
       {\externalfigure[page-graphic]}
\stopstandardmakeup

\startstandardmakeup[doublesized=no,page=right]
     \setlayer
       [page] [preset=righttop]
       {\externalfigure[page-graphic]}
\stopstandardmakeup

% less intuitive here
%
% \page[left]
%
% \setlayer
%   [page] [left] [preset=lefttop]
%   {\externalfigure[page-graphic]}
%
% \setlayer
%   [page] [right] [preset=righttop]
%   {\externalfigure[page-graphic]}
%
% \startstandardmakeup
%   flush a page
% \stopstandardmakeup

% to show bleeding:

\setuppapersize
   [A4][A3]

\setuplayout
   [location=middle]

\setupbackgrounds
   [page][frame=on]

% add this in order to clip

\setuplayout
   [clipoffset=\measure{page-bleed}]

\startstandardmakeup[doublesized=no,page={empty,left}]
     \setlayer
       [page] [preset=lefttop]
       {\externalfigure[page-graphic]}
\stopstandardmakeup

\startstandardmakeup[doublesized=no,page=right]
     \setlayer
       [page] [preset=righttop]
       {\externalfigure[page-graphic]}
\stopstandardmakeup


\stoptext

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