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-%% $Id: xytips.doc,v 3.3 1996/12/19 04:12:13 krisrose Exp $
-%%
-%% Xy-pic ``More Tips'' extension.
-%% Copyright (c) 1992-1996 Kristoffer H. Rose <kris@diku.dk>
-%%
-%% This file is part of the Xy-pic package for graphs and diagrams in TeX.
-%% Copyright (c) 1991-1996 Kristoffer H. Rose <kris@diku.dk>
-%%
-%% The Xy-pic package is free software; you can redistribute it and/or modify
-%% it under the terms of the GNU General Public License as published by the
-%% Free Software Foundation; either version 2 of the License, or (at your
-%% option) any later version.
-%%
-%% The Xy-pic package is distributed in the hope that it will be useful, but
-%% WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-%% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-%% for more details.
-%%
-%% You should have received a copy of the GNU General Public License along
-%% with this package; if not, write to the Free Software Foundation, Inc.,
-%% 675 Mass Ave, Cambridge, MA 02139, USA.
-%%
-\ifx\xyloaded\undefined \input xy \fi
-
-\xyprovide{tips}{More Tips extension}{\stripRCS$Revision: 3.3 $}%
- {Kristoffer H.~Rose}{kris@diku.dk}%
- {BRICS/Computer Science, University of Aarhus, Ny Munkegade, building 540,
- DK--8000 Aarhus~C}
-
-\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- This extension provides several additional styles of `tips' for use
- (primarily) as arrow heads, and makes it possible to define
- customised tips. This is used to support tips that mimic the style
- of the Computer Modern fonts\footnote{This function was earlier
- supported by the |cmtip| extension which is still included in the
- distribution but is now obsolete.} by Knuth~(see
- \cite{K86:ComputerMT} and \cite[appendix~F]{K84:TeXbook}) and of the
- Euler math fonts distributed by the \AMS.
-
-\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\paragraph*{Header:}\leavevmode
-\DOCHEADER
-
- First save the \Xy-commands that may need restoring.
-
-\DOCMODE(
-\xylet@\tip@xy=\tip@
-\xylet@\atip@xy=\atip@
-\xylet@\btip@xy=\btip@
-
-\xylet@\Tip@xy=\Tip@
-\xylet@\Ttip@xy=\Ttip@
-
-\xylet@\tipjot@xy=\tipjot@
-\DOCMODE)
-
- Next declare the fonts (initially the original |cm| style).
-
-\DOCMODE(
-\xyfont@\xy@@atfont=xycmat10
-\xyfont@\xy@@btfont=xycmbt10
-\DOCMODE)
-
-\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- Font selection is done with the command
-%
-\begin{defs1}
-??c![\SelectTips] |{|<family>|}| |{|<size>|}|
-\end{defs1}
-%
-\DOCMODE(
-\xydef@\tipfamily@@{cm}
-\xydef@\tipsize@@{10}
-
-\xydef@\SelectTips#1#2{%
- \DN@{#1}\ifx\next@\empty\else \def\tipfamily@@{#1}\fi
- \DN@{#2}\ifx\next@\empty\else \def\tipsize@@{#2}\fi
- \csname tipfamily \tipfamily@@\endcsname \ignorespaces}
-\DOCMODE)
-\noindent\unskip
-%
- where the <family> and <size> should be selected from the following
- table.
-%
-\begin{center}
-\def\TIPS#1#2{\hbox{\SelectTips{#1}{#2}\UseTips
- $\xy;/r1pc/**{}?>*@{>}**{-}\endxy~
- \xy;/r1pc/**{}?>*@2{>}**@2{-}\endxy~
- \xy;/r1pc/**{}?>*@3{>}**@3{-}\endxy$}}%
-\leavevmode
-\begin{tabular}{\otherbar c\otherbar c\otherbar c\otherbar c\otherbar}
-\hline
- Family & ??c![10] & ??c![11] & ??c![12] \\
-\hline
- {}??c![xy] &{}\TIPS{xy}{10} &{}\TIPS{xy}{11} &{}\TIPS{xy}{12} \\
- {}??c![cm] &{}\TIPS{cm}{10} &{}\TIPS{cm}{11} &{}\TIPS{cm}{12} \\
- {}??c![eu] &{}\TIPS{eu}{10} &{}\TIPS{eu}{11} &{}\TIPS{eu}{12} \\
-\hline
-\end{tabular}
-\end{center}
-
-\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- The table is really encoded in control sequences
- |\tipfamily|~<family> that look very much alike since all the
- currently existing combinations are merely alternative fonts. This
- is likely to change, however, \dots\smiley
-
- First |cm|, \ie, computer modern: these are simplified by the fact
- that we can use the normal double arrows.
-
-\DOCMODE(
-\xydefcsname@{tipfamily cm}{\loadtipfonts@
- \let\tip@=\tip@cm \let\atip@=\atip@cm \let\btip@=\btip@cm
- \let\Tip@=\Tip@xy \let\Ttip@=\Ttip@xy \def\tipjot@{.2em}}
-
-\xydef@\loadtipfonts@{\edef\next##1##2{##1=xy\tipfamily@@##2\tipsize@@}%
- \next{\font\xy@@atfont}{at}
- \next{\font\xy@@btfont}{bt}
-}
-
-\xydef@\tip@cm{\activatetips@ \tip@x\tip@@}
-\xydef@\atip@cm{\activatetips@ \tip@x\atip@@}
-\xydef@\btip@cm{\activatetips@ \tip@x\btip@@}
-
-\xydef@\activatetips@{\let\xyatipfont=\xy@@atfont \let\xybtipfont=\xy@@btfont}
-\DOCMODE)
-
- Next Euler tips: the single tips merely reuse the |cm| code except
- for the sligtly smaller distance between double tips; the double
- arrows have to be recoded to mimic the steeper Euler appearance.
-
-\DOCMODE(
-\xydefcsname@{tipfamily eu}{\loadtipfonts@
- \let\tip@=\tip@cm \let\atip@=\atip@cm \let\btip@=\btip@cm
- \let\Tip@=\Tip@eu \let\Ttip@=\Ttip@eu \def\tipjot@{.15em}}
-
-\xydef@\Tip@eu{\kern1.5pt \vrule height1.5pt depth1.5pt width\z@
- \Tip@@eu \kern1.5pt \egroup
- \U@c=1.5pt \D@c=1.5pt \L@c=1.5pt \R@c=1.5pt \Edge@c={\circleEdge}%
- \Invisible@false \Hidden@false \def\Leftness@{.5}\def\Upness@{.5}%
- \def\Drop@@{\styledboxz@}\def\Connect@@{\straight@{\dottedSpread@\jot}}}
-
-\xydef@\Tip@@eu{\count@=\DirectionChar
- \advance\count@-10 \ifnum\count@<\z@ \advance\count@128 \fi
- \xyatipfont\char\count@
- \advance\count@ 20 \ifnum127<\count@ \advance\count@-128 \fi
- \xybtipfont\char\count@}
-
-\xydef@\Ttip@eu{\kern2.4pt \vrule height2.4pt depth2.4pt width\z@
- \Ttip@@eu \kern2.4pt \egroup
- \U@c=2.4pt \D@c=2.4pt \L@c=2.4pt \R@c=2.4pt \Edge@c={\circleEdge}%
- \Invisible@false \Hidden@false
- \def\Leftness@{.5}\def\Upness@{.5}%
- \def\Drop@@{\styledboxz@}\def\Connect@@{\straight@{\dottedSpread@\jot}}}
-
-\xydef@\Ttip@@eu{%
- \setboxz@h\bgroup\reverseDirection@\line@ \wdz@=\z@ \ht\z@=\z@ \dp\z@=\z@
- \kern-\L@c \boxz@ \kern\L@c \Tip@@eu}
-\DOCMODE)
-
-\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- Once a selection is made, the following commands are available:
-%
-\begin{defs}
-??c![\UseTips] & activate selected tips\cr
-??c![\NoTips] & deactivate\cr
-\end{defs}
-%
-\DOCMODE(
-\xydef@\UseTips{\csname tipfamily \tipfamily@@\endcsname}
-
-\xydef@\NoTips{\let\tip@=\tip@xy \let\atip@=\atip@xy \let\btip@=\btip@xy
- \let\Tip@=\Tip@xy \let\Ttip@=\Ttip@xy \let\tipjot@=\tipjot@xy}
-\DOCMODE)
-\noindent\unskip
-%
- They are local and thus can be switched on and/or off for individual
- pictures using the \TeX\ grouping mechanism, \eg,
-%
-\begin{code}
-\SelectTips{cm}{10}
-\xy*{} \ar
- @{*{\UseTips\dir_{<<}}-*{\NoTips\dir{>}}}
- (20,5)*{} \endxy
-\end{code}
-\displaycode
-\noindent
-%
- will typeset
-$$
-\docode
-$$
- regardless of which tips are used otherwise in the document.
-
-\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\subsection{End \& log}
-
-\DOCMODE(
-\xyendinput
-
-% $Log: xytips.doc,v $
-% Revision 3.3 1996/12/19 04:12:13 krisrose
-% New for this maintenance release.
-%
-% Generalisation of xycmtip.doc,v 3.1 1995/09/05 20:31:32 kris Exp krisrose
-%
-% Revision 3.1 1995/09/05 20:31:32 kris
-% Releasing!
-%
-% Revision 3.0 1995/07/07 20:14:21 kris
-% Major release w/new User's Guide!
-%
-% Revision 2.13 1995/07/04 15:11:17 kris
-% Ready to release v3?
-%
-% Revision 2.12 1994/10/25 11:34:25 kris
-% Interim release just before v3 [works with AMS-LaTeX 1.2]...
-%
-% Revision 2.6 1993/10/21 20:36:09 kris
-% NEW file to go in version 2.7!
-%
-% Extracted from xypic.doc 2.6.1.1.
-\DOCMODE)
-
-\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-% Tell Emacs how we are formatted:
-% Local Variables:
-% mode:latex
-% fill-prefix:"\t"
-% fill-column:77
-% paragraph-separate:"^[ \t\f]*$\\|^[^\t]\\|\\\\\\\\\\|\\$\\$\\|[^\n\\\\][%&]"
-% paragraph-start:"^[ \t\f]*$\\|^[^\t]\\|\\\\\\\\\\|\\$\\$\\|[^\n\\\\][%&]"
-% End: