Re: Re: try compiling Tex showcase source : program_sample.tex

[Hans Hagen <pragma@wxs.nl>]

Christopher Creutzig wrote:

> olivier Turlier wrote:
>
>> I was trying to compile Program-sample.tex because I find the
>> transparent white frame over the grey background very nice to see for a
>> pure electronic pdf. In the same range, the vit Zyka font demo catalog
>
>
>  Sorry for not answering for such a long time.  Please try the 
> following code:
>
>
> \setupcolors[state=start]
>
> \startuseMPgraphic{bgnd}
>   StartPage;
>   linear_shade(llcorner Page -- urcorner Page
>                -- ulcorner Page -- cycle, 2,
>                0.2[red,green], 0.8[red,green]);
>   linear_shade(llcorner Page -- lrcorner Page
>                -- urcorner Page -- cycle, 2,
>                0.2[green,red], 0.8[green, red]);
>   BoundPageAreas;
> \stopuseMPgraphic
>
> \defineoverlay[bgnd][\useMPgraphic{bgnd}]
> \setupbackgrounds[page][background=bgnd]
>
> \startuseMPgraphic{brighten}
>   StartPage;
>   fill Field[Text][Text] enlarged 2pt
>     withcolor transparent(1, 0.5, white);
>   BoundPageAreas;
> \stopuseMPgraphic
>
> \defineoverlay[brighten][\useMPgraphic{brighten}]
>
> \setupbackgrounds[text][background=brighten,backgroundoffset=2pt]
>
> \starttext
>
> \input tufte
>
> \stoptext
>
>
>  I'm getting a displaced background this way (leaving the 
> backgroundoffset out does not help), but I'm sure someone will be able 
> to tell us the secret incantation to fix that.

That's because you operate on a page (btw, it's StartPage ... StopPage); 
In this case you can better use:

\startuseMPgraphic{brighten}
  fill OverlayBox enlarged 2pt
    withcolor transparent(1, 0.5, white);
\stopuseMPgraphic


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