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53 lines
2.2 KiB
53 lines
2.2 KiB
%
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% These macros allow you to rotate or flip a \TeX\ box. Very useful for
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% sideways tables or upsidedown answers.
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%
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% To use, create a box containing the information you want to rotate.
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% (An hbox or vbox will do.) Now call \@rotr\boxnum to rotate the
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% material and create a new box with the appropriate (flipped) dimensions.
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% \@rotr rotates right, \@rotl rotates left, \@rotu turns upside down, and
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% \@rotf flips. These boxes may contain other rotated boxes.
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%
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\newdimen\@rotdimen
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\newbox\@rotbox
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\def\@vspec#1{\special{ps:#1}}% passes #1 verbatim to the output
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\def\@rotstart#1{\@vspec{gsave currentpoint currentpoint translate
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#1 neg exch neg exch translate}}% #1 can be any origin-fixing transformation
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\def\@rotfinish{\@vspec{currentpoint grestore moveto}}% gets back in synch
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%
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% First, the rotation right. The reference point of the rotated box
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% is the lower right corner of the original box.
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%
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\def\@rotr#1{\@rotdimen=\ht#1\advance\@rotdimen by\dp#1%
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\hbox to\@rotdimen{\hskip\ht#1\vbox to\wd#1{\@rotstart{90 rotate}%
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\box#1\vss}\hss}\@rotfinish}
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%
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% Next, the rotation left. The reference point of the rotated box
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% is the upper left corner of the original box.
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%
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\def\@rotl#1{\@rotdimen=\ht#1\advance\@rotdimen by\dp#1%
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\hbox to\@rotdimen{\vbox to\wd#1{\vskip\wd#1\@rotstart{270 rotate}%
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\box#1\vss}\hss}\@rotfinish}%
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%
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% Upside down is simple. The reference point of the rotated box
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% is the upper right corner of the original box. (The box's height
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% should be the current font's xheight, \fontdimen5\font,
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% if you want that xheight to be at the baseline after rotation.)
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%
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\def\@rotu#1{\@rotdimen=\ht#1\advance\@rotdimen by\dp#1%
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\hbox to\wd#1{\hskip\wd#1\vbox to\@rotdimen{\vskip\@rotdimen
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\@rotstart{-1 dup scale}\box#1\vss}\hss}\@rotfinish}%
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%
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% And flipped end for end is pretty ysae too. We retain the baseline.
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%
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\def\@rotf#1{\hbox to\wd#1{\hskip\wd#1\@rotstart{-1 1 scale}%
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\box#1\hss}\@rotfinish}%
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%
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% Now the user interface for LaTeX: \rotate[type]{text} where
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% ``type'' is `l' for left, `r' for right, `u' for upside-down, or
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% `f' for flip. `l' is the default.
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%
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\def\rotate{\@ifnextchar[{\@rotate}{\@rotate[l]}}
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\def\@rotate[#1]#2{\setbox\@rotbox=\hbox{#2}\@nameuse{@rot#1}\@rotbox}
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