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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /systems/mac/textures/graphics/rotate.sty
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+%
+% These macros allow you to rotate or flip a \TeX\ box. Very useful for
+% sideways tables or upsidedown answers.
+%
+% To use, create a box containing the information you want to rotate.
+% (An hbox or vbox will do.) Now call \@rotr\boxnum to rotate the
+% material and create a new box with the appropriate (flipped) dimensions.
+% \@rotr rotates right, \@rotl rotates left, \@rotu turns upside down, and
+% \@rotf flips. These boxes may contain other rotated boxes.
+%
+% Originally written by Tomas Rokicki, and distributed with dvips.
+% Modified for Textures by Barry Smith, Blue Sky Research, 08Jul94
+
+\newdimen\@rotdimen
+\newbox\@rotbox
+
+\def\@rotstart#1{\special{postscript 0 0 transform}% get current point
+ \special{rawpostscript gsave itransform 2 copy translate
+ #1 neg exch neg exch translate}}% #1 can be any origin-fixing transformation
+\def\@rotfinish{\special{rawpostscript currentfont grestore setfont}}% gets back in synch
+%
+% First, the rotation right. The reference point of the rotated box
+% is the lower right corner of the original box.
+%
+\def\@rotr#1{\@rotdimen=\ht#1\advance\@rotdimen by\dp#1%
+ \hbox to\@rotdimen{\hskip\ht#1\vbox to\wd#1{\@rotstart{90 rotate}%
+ \box#1\vss}\hss}\@rotfinish}
+%
+% Next, the rotation left. The reference point of the rotated box
+% is the upper left corner of the original box.
+%
+\def\@rotl#1{\@rotdimen=\ht#1\advance\@rotdimen by\dp#1%
+ \hbox to\@rotdimen{\vbox to\wd#1{\vskip\wd#1\@rotstart{270 rotate}%
+ \box#1\vss}\hss}\@rotfinish}%
+%
+% Upside down is simple. The reference point of the rotated box
+% is the upper right corner of the original box. (The box's height
+% should be the current font's xheight, \fontdimen5\font,
+% if you want that xheight to be at the baseline after rotation.)
+%
+\def\@rotu#1{\@rotdimen=\ht#1\advance\@rotdimen by\dp#1%
+ \hbox to\wd#1{\hskip\wd#1\vbox to\@rotdimen{\vskip\@rotdimen
+ \@rotstart{-1 dup scale}\box#1\vss}\hss}\@rotfinish}%
+%
+% And flipped end for end is pretty ysae too. We retain the baseline.
+%
+\def\@rotf#1{\hbox to\wd#1{\hskip\wd#1\@rotstart{-1 1 scale}%
+ \box#1\hss}\@rotfinish}%
+%
+% Now the user interface for LaTeX: \rotate[type]{text} where
+% ``type'' is `l' for left, `r' for right, `u' for upside-down, or
+% `f' for flip. `l' is the default.
+%
+\def\rotate{\@ifnextchar[{\@rotate}{\@rotate[l]}}
+\def\@rotate[#1]#2{\setbox\@rotbox=\hbox{#2}\@nameuse{@rot#1}\@rotbox}