* \abovedisplayskip and \belowdisplayskip
@ 2012-09-07 2:54 Troy Henderson
2012-09-07 3:13 ` Aditya Mahajan
0 siblings, 1 reply; 3+ messages in thread
From: Troy Henderson @ 2012-09-07 2:54 UTC (permalink / raw)
To: mailing list for ConTeXt users
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It is my understanding that \abovedisplayskip and \belowdisplayskip should
adjust how much (rubber) spacing that is allowed between display math
formulas. I have attached a ConTeXt file (bug.tex) that seems to indicate
that setting these skips does not affect this (rubber) spacing. I have
also translated this ConTeXt file line-by-line to a LaTeX file (bug.ltx)
and attached it.
Both files produce a PDF (using `context bug.tex` and `pdflatex bug.ltx`)
in which the spacing between the formula changes from page 1 to page 2
simply by adding the final formula. However, by changing \adjustdisplay{0}
to \adjustdisplay{1}, the LaTeX file produces a 3 page document where the
spacing between formula does not change (as expected) on the first two
pages and thus requires a third page to typeset the final formula.
However, making this same adjustment in the ConTeXt file does not seem to
affect the output.
I would appreciate any thoughts as to why this is happening, and I would
equally appreciate a solution to keeping the spacing the same in the
ConTeXt file and thus bumping that last formula to a third page.
Troy Henderson
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[-- Attachment #2: bug.tex --]
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[-- Attachment #3: bug.ltx --]
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\documentclass{minimal}
\usepackage[paperwidth=600pt,paperheight=450pt]{geometry}
\def\adjustdisplay#1 {
\ifnum#1>0
\newdimen\mydimen
\mydimen\abovedisplayskip \abovedisplayskip\mydimen
\mydimen\belowdisplayskip \belowdisplayskip\mydimen
\fi
}
\def\foo{
\vskip0.5ex
\[\frac{x}{1} = \frac{1}{x-1}\]
\vskip0.5ex
\[x(x-1)=1\]
\vskip0.5ex
\[x^2-x=1\]
\vskip0.5ex
\[x^2-x-1=0\]
\vskip0.5ex
\[x=\frac{1+\sqrt{5}}{2},\frac{1-\sqrt{5}}{2}\]
}
\begin{document}
\pagestyle{empty}
\fontsize{20}{24}\selectfont
\adjustdisplay{0}
\foo
\clearpage
\foo\vskip0.5ex
\[\phi = \frac{x}{1} = x =\frac{1+\sqrt{5}}{2} \approx 1.618\]
\end{document}
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: \abovedisplayskip and \belowdisplayskip
2012-09-07 2:54 \abovedisplayskip and \belowdisplayskip Troy Henderson
@ 2012-09-07 3:13 ` Aditya Mahajan
2012-09-07 4:17 ` Troy Henderson
0 siblings, 1 reply; 3+ messages in thread
From: Aditya Mahajan @ 2012-09-07 3:13 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Thu, 6 Sep 2012, Troy Henderson wrote:
> It is my understanding that \abovedisplayskip and \belowdisplayskip should
> adjust how much (rubber) spacing that is allowed between display math
> formulas. I have attached a ConTeXt file (bug.tex) that seems to indicate
> that setting these skips does not affect this (rubber) spacing. I have
> also translated this ConTeXt file line-by-line to a LaTeX file (bug.ltx)
> and attached it.
>
> Both files produce a PDF (using `context bug.tex` and `pdflatex bug.ltx`)
> in which the spacing between the formula changes from page 1 to page 2
> simply by adding the final formula. However, by changing \adjustdisplay{0}
> to \adjustdisplay{1}, the LaTeX file produces a 3 page document where the
> spacing between formula does not change (as expected) on the first two
> pages and thus requires a third page to typeset the final formula.
> However, making this same adjustment in the ConTeXt file does not seem to
> affect the output.
>
> I would appreciate any thoughts as to why this is happening, and I would
> equally appreciate a solution to keeping the spacing the same in the
> ConTeXt file and thus bumping that last formula to a third page.
ConTeXt uses spacebefore and spaceafter keys to adjust the spacing around
formulas. The values of these keys are fed to `\blank[...]` so they can be
any value that `\blank[...]` accepts (none, small, medium, big, etc., or a
valid TeX dimen)
So, you should use something like
\setupformulas[spacebefore=..., spaceafter=...]
or if you only want to change the space around specific formulas
\defineformula[big][spacebefore=big,spaceafter=big]
and then use
\startbigformula ... \stopbigformula.
Aditya
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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