Re: [NTG-context] need help with creating a grid with context

11 Oct 2007

      2007/10/10, Peter Rolf :
...
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

Re: [NTG-context] need help with creating a grid with context

Wolfgang Schuster