Re: [NTG-context] vertical spacing and makeups

Am 18.04.2015 um 18:43 schrieb Pablo Rodriguez :

Dear list,

I have the following sample:

\showgrid \setupinteraction[option=max] \setuppapersize[S6] \setuppagenumbering[location=] \setupbodyfont[100pt] \setupwhitespace[big] \startsetups[setups:slides] \setupwhitespace[big] \stopsetups \setupmakeup[pagestate=start] \definemakeup[slides][setups=setups:slides] \definemakeup[slide] \starttext \startmakeup[slides]\ConTeXt\stopmakeup \startmakeup[slide]\ConTeXt\stopmakeup \page\ConTeXt \startmakeup[slides]program\stopmakeup \startmakeup[slides]descender\stopmakeup \startmakeup[slide]program\stopmakeup \startmakeup[slide]descender\stopmakeup \page program \page descender \stoptext

The first page shows that \setupwhitespace[big] affects to a single line in a makeup. Shouldn’t white space be added only between paragraphs? The second page is right vertically centered. And the third page shows that the white space isn’t added before the first paragraph in a normal page (no makeup).

This is the first issue, isn’t it a bug? Or what am I missing?

TeX inserts the \parskip value which is set by \setupwhitespace before your text in the makeup environment. Note that this happens only when you have skip before the text (e.g. with the default top=\vss setting) at the begin of the environment. The following low level example demonstrates this: \setuppapersize[A6] \starttext \dontleavehmode \ruledvbox to 3cm{\hsize=4cm text} \ruledvbox to 3cm{\hsize=4cm\parskip=2ex\relax text} \dontleavehmode \ruledvbox to 3cm{\hsize=4cm\vss text\vss} \ruledvbox to 3cm{\hsize=4cm\parskip=2ex\relax\vss text\vss} \stoptext

The second issue is about the line height. If I didn’t get it wrong from Hans some days ago, line height is the x-height, plus ascender and descender heights.

TeX has only a concept for the distance between the baseline of two lines, to get a certain line height and depth at the begin and end of your text you have to the \strut or \begstrut and \endstrut commands.

In vertical centering for makeups, why does ascender or descender height affect to basline position? Sorry, but this is a problem for readability. And it think it is better to center the line instead than a group of glyphs.

\def\startSlide {\grabbufferdata[SlideContent][startSlide][stopSlide]} \def\stopSlide {\startmakeup[standard][align=middle] \begstrut\getbufferdata[SlideContent]\endstrut \stopmakeup} \setuppapersize[S8] \setupbodyfont[100pt] \showgrid \starttext \startSlide program \stopSlide \startSlide descender \stopSlide \stoptext Wolfgang