bachotex2010-hans-taco-pearl1.tex
bachotex2010-hans-taco-pearl1.tex
—
TeX document,
2 KB (2274 bytes)
Zawartość pliku
%%% Surrounded math \newcount\repeater \def\dorecurse#1#2{% just a helper \repeater=0 \loop #2% \advance\repeater by1 \ifnum\repeater<#1\relax \repeat} % One of those features that the average user will never see is the ability to % influence \type {\mathsurround}. In \CONTEXT\ for instance this parameter is % set to \type {0pt} by default and only in special math constructs it might get % a different value. And even then, this value is small. % % It might actually be true that the sole reason for this parameter is its use in % special situations. This is demonstrated by what happens if we use non-zero % values. Say that we have this input: \def\test{% test \par \noindent $test$ \par $test$ \par test \par } \test % When we set both \type {\parindent} and \type {\mathsurround} to zero, we get: {\mathsurround 0pt \parindent 0pt \test } % When we set \type {\mathsurround} to \type {16pt} we get: {\mathsurround 16pt \parindent 0pt \test } % When we set \type {\parindent} to \type {32pt} we get: {\mathsurround 0pt \parindent 32pt \test } % When we set \type {\mathsurround} to \type {16pt} and \type {\parindent} to % \type {32pt} we get: {\mathsurround 16pt \parindent 32pt \test } % We guess that the assumption is that a \type {\mathsurround} value different % from zero is not assumed when typesetting a paragraph or at least that the % assumption is that a paragraph does not start or finish with an inline math % formula. % This is what happens. A kern is added at the left and right side of a formula. % So we get: {\mathsurround32pt|\hbox{$xx$}|} % When the paragraph is typeset, this kern removed at linebreaks % when needed: {\mathsurround32pt \dorecurse{20}{x {$xx$} xxx }} % However, as the start of a paragraph is no linebreak, it will stay there! {\mathsurround32pt \dorecurse{20}{$xx$ } } % If we use negative values we get similar effects: {\mathsurround-32pt|\hbox{$xx$}|} % Or in a vertical box: {\mathsurround-32pt \dorecurse{20}{$xx$ } } % Maybe there is an opportunity here to implement marginal notes by abusing % a math formula at the start of a paragraph! After all, we've run into weirder % abuse of side effects. \end
Akcje Dokumentu