Re: [NTG-context] Setting options for every n-th row in natural TABLEs

On Sun, 2 Sep 2012, Wolfgang Schuster wrote:

Am 02.09.2012 um 17:59 schrieb Aditya Mahajan :

...

Hi,

On Edward Tufte's website, there is a discussion on zebra coloring in tables[1]. One of the suggestion is to add a horizontal rule after every third line or shade three lines with one background color and the remaining three with another background color.

Is there an easy way to do this with natural TABLEs? I can do something like:

\setupTABLE[row][1,2,3][background=color, backgroundcolor=gray] \setupTABLE[row][7,8,9][background=color, backgroundcolor=gray]

but it requires knowing the number of lines in advance.

Aditya

[1]: http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001IV

Natural tables have “odd” and “even” keywords for \setupTABLE but none in the way you like it.

Well, I can always change what odd and even means :) (I also realized that odd and even are just dummy values. I can change them to anything, and can in fact even turn \v!oddeven to a switch statement that returns multiple values) \unprotect \def\redefineoddeven% HACK {\def\v!oddeven##1% Return odd if in set 1-3, 7-9, etc. and even otherwise {\ctxcommand{doifelse(math.mod(##1-1,6) < 3)}\v!odd\v!even}} \protect \startsetups zebra:three \redefineoddeven \setupTABLE[frame=off,background=color] \setupTABLE[row][odd][backgroundcolor=blue] \setupTABLE[row][even][backgroundcolor=red] \stopsetups \starttext \startTABLE[setups={zebra:three}] \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \NC A \NC B \NC C \NC \NR \stopTABLE \stoptext

What I would do is to use a overlay in combination with metapost to create the background but there is no global register to access the current column/row of a cell, e.g. \currenttablecolumn (this name is already used by tables) and \currenttablerow.

Thanks for the hint. It is relatively easy to access the local counter for a cell, and changing background colors dependon the current row works well. \defineconversion [triadcolors] [blue,blue,blue,red,red,red] \startsetups zebra:three \setupTABLE[frame=off,background=color] \setupTABLE[row][backgroundcolor={\convertnumber{triadcolors}{\getvalue{m_tabl_ntb_positive_row}}}] \stopsetups If I need rules, I guess I can explicitly check for the value of \m_tabl_ntb_postive_pow inside an overlay. Thanks, Aditya