Re: need help with creating a grid with context

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

2007/10/10, Peter Rolf <indiego@gmx.net>:
> Hi Peter,
>
> MASON Peter J schrieb:
> > I'm trying to layout a grid of bullets. The results isn't the expected
> > one. Perhaps someone could offer help here? Thanks.
> >
> > Here's the sort of thing I'm doing ....
> >
> > \setuplayout[leftmargin=0pt, leftmargindistance=0pt, backspace=0pt,
> > rightmargin=0pt, rightmargindistance=0pt, cutspace=0pt, width=middle,
> > topspace=0pt, header=0pt, headerdistance=0pt, footer=0pt,
> > footerdistance=0pt, bottomspace=0pt, height=middle]
> >
> > %\showlayout
> >
> > \starttext
> > \setuppositioning[unit=cm]
> > \startpositioning
> >         \newcount\Row
> >
> >         \Row    = 0
> >         \loop
> >                 {
>                   ^^
> >                         \newcount\Col
> >
>  ^^
> >                         \Col = 0
> >                         \loop
> >                                 \position(\Col, \Row) {$\bullet$}
> >                                 \ifnum\Col < 14
> >                                         \advance\Col by 1
> >                         \repeat
> >                 }
>                   ^^
> >                 \ifnum\Row < 36
> >                         \advance\Row by 1
> >         \repeat
> > \stoppositioning
> > \stoptext
> >
> You introduce "spurious spaces" (line break sometimes adds a space) in
> you loops. See
>
> http://tug.ctan.org/tex-archive/info/texbytopic/
>
> if you want to learn more about it.
>
>
> \starttext
> \setuppositioning[unit=cm]
> \startpositioning
> \newcount\Row
> \newcount\Col
>
> \Row=0
> \dorecurse{36}
>  {\Col=0
>   \dorecurse{14}
>     {\position(\Col,\Row){$\bullet$}
>      \advance\Col by 1
>     }%
>   \advance\Row by 1
>  }
> \stoppositioning
> \stoptext
>
>
> Remove the comment sign behind the inner loop and see what happens.
>
> Also see
>
> http://wiki.contextgarden.net/System_Macros/Loops_and_Recursion
>
> for the nicer ConTeXt loop macros.
>
>
> Best wishes, Peter

Hi,

there is smarter and better solution than loop for doing this work,
you can use leaders. I prefer myself xledaers in this example (alternative b).

\defineoverlay[PageGrid][\PageGrid]

\setupbackgrounds[page][background=PageGrid,offset=5mm]

\starttext

% alternative a:

\def\PageGrid
  {\setbox\scratchbox\hbox to\dimexpr\paperwidth-1cm\relax
     {\leaders\hbox to 1cm{\hss$\bullet$\hss}\hfill}%
   \vbox to\dimexpr\paperheight-1cm\relax
     {\leaders\vbox to 1cm{\vss\box\scratchbox\vss}\vfill}}

\page[empty]

% alternative b:

\def\PageGrid
  {\setbox\scratchbox\hbox to\dimexpr\paperwidth-1cm\relax
     {\xleaders\hbox to 1cm{\hss$\bullet$\hss}\hfill}%
   \vbox to\dimexpr\paperheight-1cm\relax
     {\xleaders\vbox to 1cm{\vss\box\scratchbox\vss}\vfill}}

\page[empty]

% alternative c:

\def\PageGrid
  {\setbox\scratchbox\hbox to\dimexpr\paperwidth-1cm\relax
     {\cleaders\hbox to 1cm{\hss$\bullet$\hss}\hfill}%
   \vbox to\dimexpr\paperheight-1cm\relax
     {\cleaders\vbox to 1cm{\vss\box\scratchbox\vss}\vfill}}

\page[empty]

\stoptext

Wolfgang
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