[NTG-context] different page background for chapter title page

Thomas A. Schmitz thomas.schmitz at uni-bonn.de
Sat Mar 23 12:40:47 CET 2013


Hi all,

I'm sure there must be a solution for this, but I haven't been able to 
find it yet: I want my chapter titles typeset in a sort of frame which 
will span the entire page, not only the text area, so I guess the 
easiest way to do that would be a page background. How can I set up a 
background that will appear only on the title page, in addition to the 
regular background? Bonus question: I also want the color schemes of 
both backgrounds to be different in every chapter, so the solution 
should make this possible. The example is a bit silly, but it shows what 
I'm looking for, I hope.

Thanks, and all best

Thomas

\setuplayout [header=0cm,
               topspace=1.625cm,
               footer=0cm,
               width=fit,
               height=fit]

\definecolor [color:background] [r=0.86,g=0.61,b=0.54]
\definecolor [color:title]      [r=0.91,g=0.75,b=0.7]

\startuseMPgraphic{background:normal}
StartPage ;
numeric h ; h = 10mm ;
z[1] = ulcorner Page ;
z[2] = urcorner Page ;
z[3] = z[2] shifted (0, -h) ;
z[4] = z[1] shifted (0, -h) ;
path p ; p = z[1] -- z[2] -- z[3] -- z[4] -- cycle ;
fill p withcolor \MPcolor{color:background} ;
StopPage ;
\stopuseMPgraphic

\defineoverlay [background:normal] [\useMPgraphic{background:normal}]

\startuseMPgraphic{background:title}
StartPage ;
numeric h ; h = 10mm ;
z[1] = ulcorner Page shifted (0, -1.5*h) ;
z[2] = urcorner Page shifted (0, -1.5*h);
z[3] = z[2] shifted (0, -h) ;
z[4] = z[1] shifted (0, -h) ;
path p ; p = z[1] -- z[2] -- z[3] -- z[4] -- cycle ;
fill p withcolor \MPcolor{color:title};
StopPage ;
\stopuseMPgraphic

\defineoverlay [background:title] [\useMPgraphic{background:title}]

\setupbackgrounds[page][background={background:normal,background:title}]

\starttext

\startchapter[title=One]

\input tufte

\page

\input knuth

\stopchapter

\startchapter[title=Two]

\definecolor [color:background] [r=0.82,g=0.85,b=0.68]
\definecolor [color:title]      [r=0.86,g=0.88,b=0.76]

\input tufte

\page

\input knuth

\stopchapter

\stoptext


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