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%% $Id: xytextures.doc,v 3.3 1996/12/18 09:41:45 ross Exp $
%%
%% Xy-pic ``Textures'' driver interface option.
%% Copyright (c) 1995-1996	Ross Moore	<ross@mpce.mq.edu.au>
%%
%% This file is part of the Xy-pic package for graphs and diagrams in TeX.
%% See the companion README and INSTALL files for further information.
%% Copyright (c) 1991-1996	Kristoffer H. Rose	<krisrose@brics.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{textures}{Textures driver}{\stripRCS$Revision: 3.3 $}%
 {Ross Moore}{ross@mpce.mq.edu.au}%
 {Mathematics Department, Macquarie University, NSW~2109, Australia}

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

This driver provides support for version 1.7+ of Blue Sky Research's
\Textures\ application for Macintosh\footnote{Macintosh is a trademark of
Apple Computer Inc.}.  It incorporates support for colour and all of
\Xy-pic's \PS\ effects.  Earlier versions of \Textures\ should instead use
the driver option |\xyoption{16textures}|.

Notice that version 1.7 suffers from a printing bug which may cause a \PS\
error.  A fix is kludged by making sure the first page has been shown in the
viewer before any pages with diagrams are sent to the printer.

\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\paragraph*{Header:}\leavevmode
\DOCHEADER

\DOCMODE(
\xydef@\Textures@@#1{\dvimessage@{Textures}{#1}}

\newdriver{%
 \xyaddsupport{color}\texturesColor@@
 \xyaddsupport{crayon}\texturesCrayon@@
 \xyaddsupport{ps}\texturesPS@@
 \xyaddsupport{rotate}\texturesRotate@@
 \xyaddsupport{line}\texturesLine@@
 \xyaddsupport{frame}\texturesFrames@@
 \xyaddsupport{tile}\texturesTiles@@
 \xyaddsupport{cmtip}\relax
}
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Supported |\special| effects are...
%
\begin{itemize}

\item colour, both on-screen and with \PS\ 

\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Textures uses the colour-stack method, but it requires a separate
|\special| to set the new colour after having pushed the previous colour
onto the stack.

\DOCMODE(
\xydef@\TexturesColor@push#1{\special{color push}\special{color #1}}

\xydef@\TexturesColours@{\texturesPStypes@
 \let\xylocalColor@=\xystackcolor@
 \let\xycolor@push=\TexturesColor@push
 \def\xycolor@{\xycolor@@}%
 \expandafter\ifx\csname xyps-psloaded\endcsname\empty\DN@{%
  \xyinputorelse@{xyps-c}{\xydrivernoload@{ps-c}}%
  \installPScolor@ }\else\DN@{}\fi \next@
 \ifx\xycolor@@\xyNoColor@ \let\xycolor@@=\xycolor@raw@@\fi
 \ifx\xycrayolaloaded\empty \DN@{\xystandardcolors@\texturesCrayon@@{}}%
 \else\let\next@=\xystandardcolors@ \fi \next@ 
 \let\xycolorwarning@=\relax \Textures@@{color}%
 \let\texturesColor@@=\relax
 \let\UnloadColor@@=\NoTexturesColor@
 }

\xydef@\texturesColor@@{\TexturesColours@}

\xydef@\NoTexturesColor@{%
 \let\xylocalColor@=\xyNoColor@@
 \let\xycolor@=\xyNoColor@
 \let\xycolorwarning@=\xycolorwarning@@
 \let\texturesColor@@=\TexturesColours@
 \let\UnloadColor@@=\UnloadColor@
 }
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\item crayon colours.

\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

The 68 colours are those that |dvips| recognizes by name, 
thanks to Tomas Rokicki. 

\DOCMODE(
\xydef@\texturesCrayon@@{\texturesColor@@\texturesCrayon@}
\xydef@\texturesCrayon@{\installCrayolaColors@}%
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\item \PS\ back-end.

\DOCMODE(
\xydef@\texturesPS@@{\texturesPS@}
\xydef@\texturesPSunload@{\UnloadPS@
 \let\UnloadPS@@=\UnloadPS@
 \let\texturesPS@@=\texturesPS@ }
\DOCMODE)

\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Versions 1.7 and later of \Textures\ have the following kinds of |\special|, 
the first two executing in the environment defined by the dictionary 
|userdict|. In particular these versions of \Textures\ now allow the 
\PS\ dictionary to be loaded into the main working dictionary.

\begin{itemize}
\item |\special{rawpostscript #1}| puts code directly into the \PS\ file.
\item |\special{postscript #1}| wraps the code within |sps|...|eps|, 
which involves a basis change within a |save/restore| pair.
\item |\special{prePostScript #1}| places the \PS\ code within the header
dictionary, called |TeXdict|.
\end{itemize}
Each of these has a corresponding version for reading the \PS\ commands 
from a file.

\DOCMODE(
\xydef@\texturesPStypes@{%
 \xyinputorelse@{xyps-ps}{\xydrivernoload@{ps-ps}}%
 \ifx\PSspecial@@\TexturesSpecial@\else
  \let\PSspecial@@=\TexturesSpecial@
  \let\PSmacro@@=\TexturesMacro@
  \let\PSdict@@=\TexturesDict@
  \let\PSraw@@=\TexturesRaw@
  \let\PSinclude@@=\TexturesInclude@
  \let\PSspecialdict@@=\TexturesSpecialDict@
  \let\xyPSobeylines@@=\obeyTextureslines@
  \Textures@@{PostScript}%
 \fi \texturesCurrpt@ \XYpredict@ }

\xydef@\TexturesSpecial@#1{\firstPS@@\special{postscript #1}}
\xydef@\TexturesMacro@#1{\special{postscript {#1}xy}}
\xydef@\TexturesDict@#1{\special{prePostScript #1}}
\xydef@\TexturesSpecialDict@#1{\special{prePostScript #1}}
\xydef@\TexturesInclude@#1{\firstPS@@\special{prePostScriptfile #1}}
\xydef@\TexturesRaw@#1{\firstPS@@\special{rawpostscript #1}}%

{\catcode`\^^M=\active%
 \gdef\next{\catcode`\^^M=\active \let^^M=\par%
 \let\PSspecial@@=\TexturesDict@ \obeyspaces}}
\xylet@\obeyTextureslines@=\next
\DOCMODE)

The |currentpoint| is defined for the ``raw'' specials.
For Textures this is the same as |\xyPScurrpt@@@|, in |xyps-ps.doc|.

\DOCMODE(
\xydef@\texturesCurrpt@{\let\xyPScurrpt@@=\texturesCurrpt@@}%
\xydef@\texturesCurrpt@@{\PSspecial@@{xyi}\PSraw@@{userdict begin xyx end}}

%\xydef@\texturesCurrpt@@{\PSspecial@@{% 
% 0 0 transform grestore gsave itransform }%
% \PSraw@@{userdict begin /xyYpos exch def /xyXpos exch def end}}
\DOCMODE)

The \PS\ operator called |xyx| is defined in |xyps-ps| for storing the
location placed on the stack by |xyi|.

\medskip

This installs the \PS\ backend.

\DOCMODE(
\xydef@\texturesPS@{\texturesPStypes@
 \let\texturesPS@@=\relax
 \let\UnloadPS@@=\texturesPSunload@ 
 \let\installxyps@@=\relax \installxyps@ }
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\item rotated/scaled diagrams and text, using \PS.
\DOCMODE(
\xydef@\texturesRotate@@{\texturesRotate@}

\xydef@\texturesRotate@{\texturesPStypes@
 \expandafter\ifx\csname xyps-psloaded\endcsname\empty\DN@{%
  \xyinputorelse@{xyps-r}{\xydrivernoload@{ps-r}}%
  \xyRotScale@@ \installPSrotscale@ }%
 \else\DN@{\xydriverfail@{rotations are}\UnloadRotate@\relax}\fi
 \next@}
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\item variable line-widths and poly-lines, using \PS.
\DOCMODE(
\xydef@\texturesLine@@{\texturesLine@}

\xydef@\texturesLine@{\texturesPStypes@
 \expandafter\ifx\csname xyps-psloaded\endcsname\empty\DN@{%
  \xyinputorelse@{xyps-l}{\xydrivernoload@{ps-l}}%
  \installPSline@ }%
 \else\DN@{\xydriverfail@{line-widths are}\UnloadLine@\relax}\fi
 \next@ }
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\item extra frames and fills, using \PS.
\DOCMODE(
\xydef@\texturesFrames@@{\texturesFrames@}

\xydef@\texturesFrames@{\texturesPStypes@
 \expandafter\ifx\csname xyps-psloaded\endcsname\empty\DN@{%
  \xyinputorelse@{xyps-f}{\xydrivernoload@{ps-f}}%
  \installPSframes@ }%
 \else\DN@{\xydriverfail@{frames are}\UnloadPSFrames@\relax}\fi
 \next@ }
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\item patterns and tiles, using \PS.
\DOCMODE(
\xydef@\texturesTiles@@{\texturesTiles@}

\xydef@\texturesTiles@{\texturesPStypes@
 \expandafter\ifx\csname xyps-psloaded\endcsname\empty\DN@{%
  \xyinputorelse@{xyps-t}{\xydrivernoload@{ps-t}}%
  \installPSpatterns@ \xystandardpatterns@}%
 \else\DN@{\xydriverfail@{Patterns are}\UnloadPSpatterns@\relax}\fi
 \next@ }
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\end{itemize}

\DOCMODE2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\paragraph*{The end \& Log}\leavevmode

\DOCMODE(
\xyendinput

% $Log: xytextures.doc,v $
% Revision 3.3  1996/12/18  09:41:45  ross
% minor improvements to file-loading commands
%
% Revision 3.2  1995/09/19  18:21:41  ross
% Bug fix release.
%
% Revision 3.1  1995/09/05  20:36:33  ross
% Release!
%
% Revision 3.0  1995/07/07  20:13:19  ross
% Major release w/new User's Guide!
%
% Revision 2.13  1995/07/04  15:04:51  ross
% Ready for release of v3.
%
% NEW for version 3. 
\DOCMODE)

\DOCMODE3%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Tell Emacs that this is a LaTeX document and how it is formatted:
% Local Variables:
% mode:latex
% fill-column:77
% End: