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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)
%
% 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.
% Known problems
% - 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 indicat 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.
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