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+% Supported drivers sofar:
+% dvitops (James Clark)
+% dvips (Tom Rokicki)
+% dvitoln03 (Brian {Hamilton Kelly})
+% emTeX (dvidrv) (Eberhard Mattes)
+% VTeX (Michael Vulis)
+% PDFTeX (Piet van Oostrum)
+% XeTeX (Apostolos Syropoulos)
+%
+% change history
+%
+% Revisions:
+% Support for twosided.sty added. January, 1987.
+%
+% Warning message added to indicate that another pass is
+% required. May, 1987.
+%
+% Converted to work with dvitops. March 1990.
+% Neil Winton (nwinton@axion.bt.co.uk)
+%
+% Usage by several drivers SPQR spqr@uk.ac.soton.ecs
+%
+% v2.0 22-11-90 JLB merged the original file with Niel Winton's mods
+% now supports both DVI2LN3 and DVItoPS specials. This introduces
+% one extra user-command, \device{<device>}. If he says \device{PS}
+% the PostScript \specials (DVItoPS by James Clark) will be used,
+% anything else gives the original LN03 \specials.
+%
+% v2.1 06-04-91 SPQR changed the \ifPS statements to be case
+% statements which check the value of a counter called \driver@setup,
+% and issue specials accordingly. dvitops, dvips and LN03 are only
+% drivers supported.
+% v2.2 07-03-91 JLB Located all \specials in one place by defining
+% the use of three new macros. Supplied a user command to select
+% the driver and added code to \document for initializing the
+% \special-macros.
+% v2.2a 08-03-91 JLB \ps@scale needs a different value for DVItoPS and DVIPS
+% so moved initialization of it inside \setup@specials
+% v2.2b 08-03-91 JLB The definitions of the \connect macro needed extra
+% \space commands, because its arguments can be control sequences.
+% v2.2c 08-04-91 JLB Removed use of \cb@beginSaves and \cb@saveBeginPoint
+% because - it didn't work as specified
+% - seemed unnecessary
+% - broke PostScript support because of use of \xdef
+% \cb@processActive now calls \cb@setBeginPoint instead of
+% \cb@saveBeginPoint. Left the code and comment in for now
+% until I'm sure this change doesn't break anything else...
+% v2.2d 30-4-91 EN changed resolution dependent parameters in dvips
+% specials so it will work on any device using the device's resolution.
+% Additionally added \newif\ifouterbars. \outerbarstrue will put
+% the bars to the outside of the pages.
+% Without the twoside option this will give right hand side bars.
+% The positioning of right edge changebars was off by \changebarsep,
+% this has been corrected also.
+% I do not know if there are changes needed in other than Tom Rokicki's
+% drivers since this is the only one I can test.
+% v2.2e 13-6-91 JB The documentation stated that the greylevel of the
+% changebar could be modified with the command
+% \setcounter{\changebargrey}{percentage}.
+% This was a mistake, \changebargrey was allocated using \newcount
+% (always). Now modified to use \newcount for plain TeX and
+% \newcounter for LaTeX.
+% v2.2f 15-10-91 JB Added support for the emTeX drivers, based on
+% information from Eberhard Mattes about version 1.4j of the dvidrv
+% program. Also started updating the documentation towards doc.sty
+% standards.
+% v2.3 15-10-91 JB Started merging this version of changebar.sty with
+% version, dated 1988, distributed with DVItoLN03. This will eventually
+% result in version 3.0, hopefully documented using doc.sty.
+% Removed vain attempt to make file compatile with plain.
+% v2.4 16-10-91 JB Reduced the number of points defined to two per
+% bar, removed the need for \cb@tempcnt while removing the problem
+% with incorrect changebars across pageboundaries in PostScript
+% mode. Also \ps@scale has been removed.
+% v3.0 14-nov-91 JB Completed converting the documentation to doc.sty
+% format. Also solved the problem with bars appearing on the wrong
+% side.
+%
+% v3.1 02-07-93 JB Finally got round to include Erich Neuwirth's comments
+% and made a new distribution. Erich corrected the placement of the
+% bars and the conversion of the coordinates when DVIps (Rokicki)
+% is used. Also included Hal Peterson's comments about spaces
+% creeping into the output.
+%
+% v3.1b 11-10-93 Spurious white space crept into footnotes because of
+% a missing %-sign. Found by Norm Walsh <walsh@cs.umass.edu>.
+% Fixed.
+%
+% v3.2b 30-06-95 Finally got the LaTeX2e version working; see \changes
+% entries in the .dtx file to see what changed.
+% Changebar now uses the LaTeX option mechanism; so \driver
+% disappeared.
+% New options are leftbars and rightbars, tracon and traceoff.
+%
+% v3.2c 26-03-96 Reintroduced the \driver command in compatibility
+% mode. Fixed the checksum.
+% Juergen Vollmer <vollmer@ipd.info.uni-karlsruhe.de> enhanced
+% the shell script which automatically adds changebar commands
+% to your document.
+%
+% v3.3a 26-09-97 Finally fixed the diagonal bars by (re-)introducing
+% four points for each bar (instead of two). Made it work with
+% LaTeX's twocolumn option. Fixed positioning problems.
+%
+% v3.3b 30-09-97 It turns out that the emTeX driver and dvips have
+% different ideas about their origin. Had to subtract 1 inch
+% from horizontal positions for emTeX drivers.
+%
+% v3.3d 28-10-97 It now turns out that Xdvi shows the changebars with
+% an offset of 1 inch; removed inappropriate pieces of code.
+%
+% v3.3e Added support for Textures (1.7.7), provided by James Ashton
+% <James.Ashton@keating.anu.edu.au>
+% Added chbar.1 to the distribution. The file was provided by
+% John A. Murdie <john@minster.cs.york.ac.uk>
+%
+% v3.3i Changebar didn't pay enough attention to the setting of
+% twoside. In onesided documents the value of \evensidemargin
+% should be ignored.
+% \cb@startSpanBars no longer pushes points on the current stack
+% as this confused the algorithm and was wrong anyway.
+% Introduced a tracing facility for the stack mechanisms
+% Now use the history stack to determine the final page on which
+% the beginning and ending of the changebars appear. This fixes
+% most problems with floating objects and diagonal bars at page
+% boundaries.
+% Redefined \cbstart and \cbend in terms of the LaTeX
+% environment. This catches wrong use of \cbstart ...\cbend with
+% respect to TeX's grouping levels.
+%
+% v3.3j The rightbars option was broken;
+% found by Richard Stanton" <stanton@haas.berkeley.edu>
+% In the oneside mode \cb@even@right received no value instead
+% \cb@even@left was set equal to \cb@odd@left and reset
+% afterwards.
+%
+% v3.4a Michael Vulis submitted the code for VTeX support
+%
+% v3.4b Changebar and the color package clash;
+% found by Erwin Achermann <acherman@inf.ethz.ch>
+% Because of the extra group and box level for floating objects.
+% The redefinition in this package of \@endfloat didn't take
+% that into account.
+% repaired a few typos in the documentation.
+% Introduced support for coloured changebars with the dvips
+% driver.
+%
+% v3.4c small typo repaired
+%
+% v3.4d Autodetect VTeX and provide the right default driver;
+% added possibility of having changebar.cfg to specify a default
+% driver.
+% Issue an error when \cbcolor is used when the color option
+% isn't specified.
+%
+% v3.4e Double column floats didn't carry a change bar because the
+% LaTeX macro \end@dblfloat wasn't adapted for changebar
+% Changebars in the first column appeared twice because of
+% an error in the conditional which decides where to put the
+% bar.
+% The color error is now a warning.
+% Fixed a few typos.
+% Reverted the change in the definition of \cbstart and \cbend
+% as it prevented changebars starting inside an environment and
+% ending outside of it.
+%
+% v3.4f Fixed a problem with \changebarwidth; it seemed to become
+% hardwired due to a bug in the stack handling. \cb@checkpage
+% effectively changed the value of \cb@curbarwd.
+%
+% v3.4g When the preamble of the document changes the value of the
+% page counter the code gets confused when the new page number
+% is even. Now initialize \cb@pagecount to \c@page - 1.
+% The mechanism with \cb@pagecount and \cb@page may need a
+% redesign to make it robust.
+%
+% v3.4h Herbert Voss (Herbert dot Voss at alumni dot TU-Berlin dot DE>
+% suggested to support the xcolor package as well as the color
+% package.
+%
+% v3.5a Piet van Oostrum: Resolved bugs in twocolumn mode, mid-document
+% changes to page number, covering parts with large depth (like
+% formulas and parboxes), added pdflatex support.
+%
+% v3.5b JLB: added an extra check (after the call to \ProcessOptions
+% to ensure that pdftex.def is used when in pdf producing mode,
+% even when the document still contains the option "dvips"
+%
+% v3.5c JLB: Add a small change in the TeXtures specific code that
+% was submitted by Blue Sky Systems; made it work with both the
+% color and xcolor packages.
+%
+% v3.6a Apostolos Syropoulus submitted support for XeTeX
+%
+% v3.6a JLB: a small change in the XeTeX macros
+%
+% v3.6b JLB: set changebarsep to 0.5\marginparsewp instead of 30pt
+% in order to prevent the changebar crossing a marginal paragraph.
+%
+% v3.6c JLB: changed the definition of \cb@checkPDF in order to prevent
+% an extra page at the end of the document, filled with "spsp"
+
+% Known problems
+% - changebars for mmarginal paragraphs collide with changebars
+% for the main body of text
+% - With PostScript a dictstack overflow seems to occur with
+% many changebars. cb@maxpoint=20 seems to help
+% - I have received the file chgbar.sty, which was written by
+% David B. Johnson (dbj@titan.rice.edu) back in 1990. It uses
+% LaTeX marginpar mechanism to implement change bars. I Haven't
+% yet dared to see if I can merge these two packages into one
+% - When using \cbstart with an optional parameter that is different
+% from \changebarwidth the distance between the text margin and
+% the changebar will not be \changebarsep. Instead, the center of
+% the changebar will be aligned with the other changebars. The
+% solution to this would be to give an additional parameter to the
+% \cb@connect macro to indicate if the bar is on the left or on the
+% right. \cb@connect can then do the proper positioning. In that
+% case it is easier not to include the 0.5\changebarwidth
+% correction in the calculations in \cb@positions.
+% - The syntax \cbcolor[rgb]{1,0,0} doesn't work with the xcolor option.