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+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{gastex}[2006/11/28 v2.8]
+\newif\ifgastexslide\gastexslidefalse
+\DeclareOption{slide}{\global\gastexslidetrue}
+\DeclareOption{paper}{\global\gastexslidefalse}
+\ProcessOptions
+\RequirePackage{calc,trig}
+\special{header=gastex.pro}
+% \input gastex.ps
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%
+%% GasTeX : Graphs and Automata Simplified in TeX
+%%
+%% Macros for drawing easily graphs and automata under the picture
+%% environment of LaTeX2e.
+%% See the README file
+%%
+%% Paul Gastin
+%% LSV
+%% ENS de Cachan
+%% 61, avenue du Prˇsident Wilson
+%% F-94235 CACHAN Cedex
+%% FRANCE
+%% http://www.lsv.ens-cachan.fr/~gastin/
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% A lot of changes has been made since gastex 1.0 and as a result,
+% these new macros are no longer compatible with the previous ones.
+% To be able to use old pictures, a compatible mode is provided
+% (see \compatiblegastexun at the end of the file). The compatibility
+% is almost 100% and should be sufficient in most cases.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% History since version 2.0
+%
+% 2.8:
+% - packaged for CTAN
+%
+% 2.7:
+% - gastex is now compatible with the xcolor package which allows very
+% useful color expressions such as red!50!blue!60!white.
+%
+% 2.6:
+% - improved precision of some computations
+%
+% 2.5:
+% The horizontal shifts that one gets sometimes (e.g. with overlays in
+% presentations) should no more occur provided \nullfont is used inside the
+% picture environment:
+% \begin{picture}(100,35)(-50,0)\nullfont
+% ...
+% \end{picture}
+% \selectfont is automatically used by gastex for node or edge labels.
+% I found this solution looking in the package pgf (portable graphics
+% format) by Till Tantau. I also recommend his excellent beamer package
+% for laptop presentations.
+%
+% 2.4:
+% - added the macro \rpnode to allow nodes whose shape is a regular polygon
+% defined by its radius, its number of sides and an angle for the first point.
+% - added the possibility to have arrows at the tail of edges and lines.
+% For this, the following new parameters are provided:
+% ATnb, ATdist, ATangle, ATlength, ATLength
+% - added the macro \drawpolygon to draw a polygon defined by a list of points.
+% - added the macro \drawrpolygon to draw a regular polygon defined by
+% its radius, its number of sides and an angle for the first point.
+% - added the macro \drawline to draw a broken line defined by n points.
+% - added the parameter "arcradius" in order to have arcs instead of sharp angles
+% for polygons and broken lines. The default is arcradius=0 for sharp angles.
+% - added the macro \drawcurve to draw a continuous curve going through n points.
+% - added the macro \drawccurve to draw a continuous closed curve going through n points.
+% All these macros use gasset parameters and in particular:
+% Nframe, Nfill, linecolor, fillcolor, dash, ...
+%
+% Uncompatibility: The macro \drawline was introduced in version 2.1 to
+% draw a line between two points. The new version allows to draw a line
+% defined by an arbitrary number of points but the syntax is different.
+% It was \drawline(x1,y1,x2,y2) and it is now \drawline(x1,y1)(x2,y2).
+%
+% 2.3:
+% - added the parameter ELdistC (y or n) allowing to specify whether
+% the distance (ELdist) is between the center (y) of the label and the edge
+% or between the side (n) of the label and the edge.
+% The behaviour of previous gastex versions corresponds to the setting
+% (n) which is therefore the default.
+% - added the macro \drawqbpedge allowing to specify the auxiliary
+% point of a quadratic Bezier curve with two angles instead of the
+% absolute coordinates required by \drawqbedge.
+% - added parameters sxo, syo, exo, eyo (offsets in \unitlength).
+% They define offsets for the virtual starting and ending points of an
+% edge with respect to the centers of the starting and ending nodes.
+% - improved drawing for arrowheads (in gastex.pro).
+% First, the direction of the arrowhead is better for curved edges.
+% Second, when several arrowheads are drawn they follow the curve.
+% Previously, they followed the tangent at the ending point of the
+% edge which was bad for curved edges.
+%
+% 2.2:
+% - added the options slide and paper to the package.
+% In order to get the default settings for slides, use
+% \usepackage[slide]{gastex}
+% The default settings for papers is obtained with
+% \usepackage[paper]{gastex}
+% or
+% \usepackage{gastex}
+% - added new option loopCW to define whether loops are in
+% clockwise direction or not.
+% - Fix a TeX error (Arithmetic overflow) that occurred when using
+% \drawedge(A,B){} with two nodes A and B having the same coordinates.
+% Now, in this case, an error message is issued in the log
+% and the macro \drawedge(A,B){} is ignored.
+%
+% 2.1:
+% - New macros to draw directly circles, rectanges, ovals,
+% lines and bezier curves.
+% \drawcircle, \drawrect, \drawoval,
+% \drawline, \drawqbezier, \drawcbezier
+% All these macros use gasset options and in particular:
+% Nframe, Nfill, linecolor, fillcolor, dash, AHnb, etc...
+% - Compatibility mode for pspictpg up to v0.6
+% - Fix the bug which occured sometimes when using Nw=0,Nh=0.
+%
+% 2.01:
+% - Fix an error that occured in v2.0 when using Nfill=y without
+% defining previously fillgray or fillcolor.
+% The following default setting has been added.
+% \gasset{fillgray=0,Nfill=n} % Not filled but black if filled
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% Known problems and (hopefully) solutions.
+%
+% 21/10/99: Frank Goertzen (frank.goertzen@unibw-muenchen.de) has
+% reported that when using gastex together with german an error may
+% occur when running dvips if the german package is loaded first. The
+% solution is to load gastex before german:
+% \usepackage{gastex}
+% \usepackage{german}
+% I have no idea concerning the cause of this error.
+%
+% 07/03/00: A postscript error may occur when using Nw=0,Nh=0.
+% Solution: Use a small value instead of 0, e.g. Nw=0.1,Nh=0.1
+% Fixed in version 2.1.
+%
+% 27/10/00: Using gasset inside a tabular or an array produces an error.
+% The reason is that I'm using the "&" symbol as a marker in order to
+% process gasset options.
+% Solution: Include the whole picture inside an mbox.
+% \begin{tabular}{c}
+% \mbox{\begin{picture}(10,20)(-5,-5)
+% \gasset{ELdist=0}
+% \node(A)(0,0){1}\drawloop(A){$a$}
+% \end{picture}}
+% \end{tabular}
+%
+% pdflatex: gastex does not work with pdflatex since it produces
+% postscript code and pdflatex does not know what to do with it.
+% Solution: Use latex and then ps2pdf.
+% I don't know whether it is possible to translate my postscript code
+% into pdf code. The problem is that I'm using postscript to make some
+% computations and not only to draw the picture.
+% I would appreciate the help of a pdf guru on this.
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Internal variables and macros
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\newcounter{cnt@a}\newcounter{cnt@b}\newcounter{cnt@c}
+\newdimen\dim@x \newdimen\dim@y
+\newbox\temp@box
+\newdimen\d@my@unit \d@my@unit=0.01mm
+% \d@my@unit is the unit used for all drawings with gastex.
+% All values given in \unitlength are converted in \d@my@unit.
+% The aim is to improve the precision of the drawings.
+
+{\catcode`t=12\catcode`p=12\gdef\no@PT#1pt{#1}}
+\def\strip@PT#1{\expandafter\no@PT\the#1\space}
+
+\def\gas@initps{!BP
+ \gas@dash
+ \line@width setlinewidth\space}
+
+\def\gas@AHparam{\AH@nb\AH@d\AH@angle\AH@L\AH@l}
+\def\gas@ATparam{\AT@nb\AT@d\AT@angle\AT@L\AT@l}
+\def\gas@ATnul{0 \AT@d\AT@angle\AT@L\AT@l}
+\def\gas@gobble#1{}%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Settings
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%-----------------------------------------------------------------------
+% Set values for gastex parameters.
+%
+% \gasset{parameter=value,parameter=value,...}
+% optional spaces are only allowed after commas
+%
+% Nw=number
+% widht in \unitlength of oval nodes
+% Nh=number
+% height in \unitlength of oval nodes
+% Nmr=number
+% maximal radius in \unitlength of oval nodes
+% The actual radius will be min(Nw/2,Nh/2,Nmr)
+% Nmr=0 yields a rectangle node
+%
+% Nadjust=any combination of the letters w,h,n
+% w : the node width is adjusted to the node label width + Nadjustdist
+% h : the node height is adjusted to the node label height + Nadjustdist
+% n : no adjustment
+% Nadjustdist=number
+% distance in \unitlength between the label box and the node frame
+% when using Nadjust
+%
+% Nframe=y or n
+% boolean flag defining whether nodes are framed or not.
+% Nfill=y or n
+% boolean flag defining whether nodes are filled or not.
+% Automatically set to true by the parameters fillgray and fillcolor
+%
+% ExtNL=y or n
+% boolean flag defining whether node labels are external or not.
+% NLangle=number
+% direction in degree of node labels
+% NLdist=number
+% The meaning depends on the ExtNL flag.
+% If the flag is set to "n" then NLdist defines the distance
+% in \unitlength between the node center and the label center.
+% If the flag is set to "y" then NLdist defines the distance
+% in \unitlength between the node frame and the label box.
+%
+% Nmarks=any combination of the letters i,f,r,n
+% i : initial mark on nodes
+% f : final mark on nodes
+% r : repeated mark on nodes
+% n : no mark on nodes
+% ilength=number
+% length in \unitlength of arrows marking initial nodes
+% iangle=number
+% direction in degree of arrows marking initial nodes
+% flength=number
+% length in \unitlength of arrows marking final nodes
+% fangle=number
+% direction in degree of arrows marking final nodes
+% rdist=number
+% distance in \unitlength between the lines of repeated nodes
+% a positive value draw the second line inside the normal one
+% a negative value draw the second line outside the normal one
+% but the edges are still connected to the normal line.
+%
+% An edge virtually starts from the center of the starting node and
+% ends at the center of the ending node (indeed they are only drawn
+% outside of the nodes). It is possible to change the virtual starting
+% and ending points of an edge using offsets with respect to the center
+% of the starting and ending node. This is the purpose of the following
+% parameters.
+% sxo=number (starting x offset)
+% horizontal offset in \unitlength of the starting point of an edge
+% with respect to the center of the starting node.
+% syo=number (starting y offset)
+% vertical offset in \unitlength of the starting point of an edge
+% with respect to the center of the starting node.
+% exo=number (ending x offset)
+% horizontal offset in \unitlength of the ending point of an edge
+% with respect to the center of the ending node.
+% eyo=number (ending y offset)
+% vertical offset in \unitlength of the ending point of an edge
+% with respect to the center of the ending node.
+%
+% curvedepth=number
+% depth in \unitlength of curved edges between two nodes
+% The absolute value of curvedepth defines the distance between the
+% middle of the curved edge and the center of the line joining the two nodes
+% With a positive/negative value the curved edge is on the left/right
+% of the line joining the two nodes.
+%
+% loopdiam=number
+% diameters in \unitlength of loops
+% loopangle=number
+% direction in degree of loops
+% loopCW=y or n
+% boolean flag defining whether loops are in clockwise direction or not.
+%
+% AHnb=number
+% number of arrow(s) at the head of edges.
+% 0 for no arrowhead.
+% AHdist=number
+% distance in \unitlength between two arrowheads
+% AHangle=angle
+% angle in degree between the edge and the arrowhead side
+% AHLength=number
+% Length in \unitlegth of the arrowhead side
+% AHlength=number
+% length in \unitlegth defining the shape of the arrowhead
+% 0 for an arrowhead formed with just two lines
+% Length*cos(angle) for a triangular arrowhead
+% See examples.
+%
+% ATnb=number
+% number of arrow(s) at the tail of edges.
+% 0 for no arrowhead.
+% ATdist=number
+% distance in \unitlength between two arrowtails
+% ATangle=angle
+% angle in degree between the edge and the arrowtail side
+% ATLength=number
+% Length in \unitlegth of the arrowtail side
+% ATlength=number
+% length in \unitlegth defining the shape of the arrowtail
+% 0 for an arrowtail formed with just two lines
+% Length*cos(angle) for a triangular arrowtail
+% See examples.
+%
+% ELside=l or r
+% label on the (l)eft or (r)ight side of the edge
+% ELpos=0..100
+% position of the label along the edge.
+% 0 : starting node
+% 50 : middle of the edge
+% 100 : ending node
+% ELdist=number
+% distance in \unitlength between the label and the edge
+% ELdistC=y or n
+% y : The distance is between the center of the label and the edge.
+% With ELdist=0 the center of the label is on the edge.
+% n : The distance is between the side of the label and the edge.
+% This is the default.
+% The distance is actually between the side of the label and
+% the tangent of the edge which is usually a good approximation.
+% It may not work very well if the label is large and the edge is
+% strongly curved because then the tangent is far from the edge at the
+% point that achieve the distance between the tangent and the label.
+%
+% linegray=decimal number between 0 and 1
+% gray level used to draw lines. 0=black, 1=white.
+% fillgray=decimal number between 0 and 1
+% gray level used to fill nodes. 0=black, 1=white.
+% linecolor=ColorName
+% color used to draw lines.
+% The color name should be defined in dvipsnam.def and one should
+% include \usepackage[usenames]{color}.
+% This is to avoid the trouble of defining our own colors.
+% The drawback is that it is not possible to define and use other colors.
+% It should not be very restrictive since plenty of colours are
+% defined in dvipsnam.def.
+% It should not be difficult to add the possibility of using new
+% colors if needed.
+% fillcolor=ColorName
+% color used to fill nodes. See remarks above.
+% linewidth=number
+% width in \unitlegth of lines
+% dash={list of numbers}{offset}
+% Set the dash pattern used for drawing postscript paths.
+% The numbers in the list indicate alternatively lengths
+% in \unitlength of dashes and lengths in \unitlength of spaces.
+% The list of lenghts is used circularly.
+% offset allows to start the pattern at some distance from its beginning.
+% Here are some examples:
+% dash={}{0} % continuous path
+% dash={1.5}0 % dashs of length 1.5 and empty spaces of length 1.5
+% dash={0.2 0.5}0 % looks like a sequence of dots
+% dash={4 1 1 1}0 % alternation of long and short dashs
+% dash={1.5}{1.5} % we start with the empty space and not the dash
+% dash={4}{2} % we start in the middle of the first dash
+%
+% arcradius=number
+% radius in \unitlength of the arcs used at the vertices
+% of polygons and broken lines. 0 for sharp angles.
+% polyangle=angle
+% angle in degrees with respect to the x axis of the first vertex
+% of the regular polygon.
+%
+\def\gasset#1{\gas@set#1,&}%
+\def\gas@set#1=#2,{\ignorespaces%
+ \@ifundefined{gasset@#1}
+ {\PackageWarning{gastex}{Parameter #1 undefined}{}}
+ {\csname gasset@#1\endcsname{#2}}%
+ \@ifnextchar&{\gas@gobble}{\gas@set}}
+
+\def\gasset@Nw#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\N@w{\thecnt@a}}%
+\def\gasset@Nh#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\N@h{\thecnt@a}}%
+\def\gasset@Nmr#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\N@mr{\thecnt@a}}%
+
+\newif\if@wadjust \newif\if@hadjust \newif\if@nadjust
+\def\gasset@Nadjust#1{%
+ \@wadjustfalse \@hadjustfalse \gasset@@Nadjust #1&}
+\def\gasset@@Nadjust#1{%
+ \@ifundefined{if@#1adjust}
+ {\PackageWarning{gastex}{Node adjust #1 undefined}{}}
+ {\csname @#1adjusttrue\endcsname}%
+ \@ifnextchar&{\gas@gobble}{\gasset@@Nadjust}}
+\def\gasset@Nadjustdist#1{%
+ \setcounter{cnt@a}{2*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\N@adjustdist{\thecnt@a}}%
+
+\newif\if@frame \newif\if@fill \newif\if@ExtNL
+\def\flag@y{\relax}\def\flag@n{\relax}
+\def\gasset@Nframe#1{%
+ \@ifundefined{flag@#1}
+ {\PackageWarning{gastex}{Nframe value should be y or n}{}}
+ {\if#1y \@frametrue \else \@framefalse \fi}}
+\def\gasset@Nfill#1{%
+ \@ifundefined{flag@#1}
+ {\PackageWarning{gastex}{Nfill value should be y or n}{}}
+ {\if#1y \@filltrue \else \@fillfalse \fi}}
+\def\gasset@ExtNL#1{%
+ \@ifundefined{flag@#1}
+ {\PackageWarning{gastex}{ExtNL value should be y or n}{}}
+ {\if#1y \@ExtNLtrue \else \@ExtNLfalse \fi}}
+
+\def\gasset@NLangle#1{\edef\NL@angle{#1}}%
+\def\gasset@NLdist#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\NL@dist{\thecnt@a}}%
+
+\newif\if@imark \newif\if@fmark \newif\if@rmark \newif\if@nmark
+\def\gasset@Nmarks#1{%
+ \@imarkfalse \@fmarkfalse \@rmarkfalse \gasset@@Nmarks #1&}
+\def\gasset@@Nmarks#1{%
+ \@ifundefined{if@#1mark}
+ {\PackageWarning{gastex}{Node mark #1 undefined}{}}
+ {\csname @#1marktrue\endcsname}%
+ \@ifnextchar&{\gas@gobble}{\gasset@@Nmarks}}
+
+\def\gasset@ilength#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\i@length{\thecnt@a}}%
+\def\gasset@iangle#1{\edef\i@angle{#1}}%
+\def\gasset@flength#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\f@length{\thecnt@a}}%
+\def\gasset@fangle#1{\edef\f@angle{#1}}%
+\def\gasset@rdist#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\rep@dist{\thecnt@a}}%
+
+\def\gasset@sxo#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\E@sxo{\thecnt@a}}%
+\def\gasset@syo#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\E@syo{\thecnt@a}}%
+\def\gasset@exo#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\E@exo{\thecnt@a}}%
+\def\gasset@eyo#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\E@eyo{\thecnt@a}}%
+
+\def\gasset@curvedepth#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\curve@depth{\thecnt@a}}%
+
+\def\gasset@loopdiam#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\loop@diam{\thecnt@a}}%
+\def\gasset@loopangle#1{\edef\loop@angle{#1}}%
+\newif\if@loopCW
+\def\gasset@loopCW#1{%
+ \@ifundefined{flag@#1}
+ {\PackageWarning{gastex}{loopCW value should be y or n}{}}
+ {\if#1y \@loopCWtrue \else \@loopCWfalse \fi}}
+
+\def\gasset@AHnb#1{\edef\AH@nb{#1\space}}%
+\def\gasset@AHdist#1{%
+ \dim@x=#1\unitlength \edef\AH@d{\strip@PT\dim@x}}%
+\def\gasset@AHangle#1{\edef\AH@angle{#1\space}}%
+\def\gasset@AHLength#1{%
+ \dim@x=#1\unitlength \edef\AH@L{\strip@PT\dim@x}}%
+\def\gasset@AHlength#1{%
+ \dim@x=#1\unitlength \edef\AH@l{\strip@PT\dim@x}}%
+
+\def\gasset@ATnb#1{\edef\AT@nb{#1\space}}%
+\def\gasset@ATdist#1{%
+ \dim@x=#1\unitlength \edef\AT@d{\strip@PT\dim@x}}%
+\def\gasset@ATangle#1{\edef\AT@angle{#1\space}}%
+\def\gasset@ATLength#1{%
+ \dim@x=#1\unitlength \edef\AT@L{\strip@PT\dim@x}}%
+\def\gasset@ATlength#1{%
+ \dim@x=#1\unitlength \edef\AT@l{\strip@PT\dim@x}}%
+
+\def\ELside@l{\relax}\def\ELside@r{\relax}
+\def\gasset@ELside#1{%
+ \@ifundefined{ELside@#1}
+ {\PackageWarning{gastex}{ELside value should be l or r}{}}
+ {\edef\EL@s{#1}}}%
+\def\gasset@ELpos#1{
+ \ifnum#1>100
+ \PackageWarning{gastex}{ELpos value should be between 0 and 100}{}
+ \else\ifnum#1<0
+ \PackageWarning{gastex}{ELpos value should be between 0 and 100}{}
+ \else\edef\EL@p{#1}\fi\fi}%
+\def\gasset@ELdist#1{%
+ \setcounter{cnt@a}{1*\ratio{#1\unitlength}{\d@my@unit}}
+ \edef\EL@dist{\thecnt@a}}%
+\newif\if@ELdistC
+\def\gasset@ELdistC#1{%
+ \@ifundefined{flag@#1}
+ {\PackageWarning{gastex}{ELdistC value should be y or n}{}}
+ {\if#1y \@ELdistCtrue \else \@ELdistCfalse \fi}}
+
+\def\gas@rgb@model{setrgbcolor}%
+\def\gas@cmyk@model{setcmykcolor}%
+\def\gas@gray@model{setgray}%
+\def\gas@color#1#2{\@ifundefined{gas@#1@model}%
+ {\PackageWarning{gastex}{Color model '#1' not supported}{}}
+ {\def\gas@tmp@col{}\gas@recode #2,&}%
+ \edef\gas@tmp@col{\gas@tmp@col\csname gas@#1@model\endcsname}}%
+\def\gas@recode#1,{\edef\gas@tmp@col{\gas@tmp@col #1 }%
+ \@ifnextchar&{\gas@gobble}{\gas@recode}}
+
+\def\gasset@linegray#1{\edef\line@color{#1 setgray\space}}%
+\def\gasset@linecolor#1{\@ifundefined{extractcolorspec}%
+ {\@ifundefined{\string\color @#1}
+ {\PackageWarning{gastex}{Color #1 undefined}{}}
+ {\edef\line@color{#1\space}}}%
+ {\extractcolorspec{#1}{\gas@tmp@color}%
+ \expandafter\gas@color\gas@tmp@color%
+ \edef\line@color{\gas@tmp@col\space}}}%
+
+\def\gasset@fillgray#1{\@filltrue\edef\fill@color{#1 setgray\space}}%
+\def\gasset@fillcolor#1{\@ifundefined{extractcolorspec}%
+ {\@ifundefined{\string\color @#1}
+ {\PackageWarning{gastex}{Color #1 undefined}{}}
+ {\@filltrue\edef\fill@color{#1\space}}}%
+ {\extractcolorspec{#1}{\gas@tmp@color}%
+ \expandafter\gas@color\gas@tmp@color%
+ \@filltrue\edef\fill@color{\gas@tmp@col\space}}}%
+
+\def\gasset@linewidth#1{%
+ \dim@x=#1\unitlength \edef\line@width{\strip@PT\dim@x}}%
+\def\gasset@dash#1{\gasset@@dash #1}%
+\def\gasset@@dash#1#2{%
+ \def\gas@dash{[}%
+ \gas@convert 0 #1 &
+ \dim@x=#2\unitlength
+ \edef\gas@dash{\gas@dash] \strip@PT\dim@x setdash\space}}%
+\def\gas@convert#1 {%
+ \dim@x=#1\unitlength
+ \ifdim\dim@x=0pt\else\edef\gas@dash{\gas@dash\strip@PT\dim@x}\fi%
+ \@ifnextchar&{\gas@gobble}{\gas@convert}}
+
+\def\gasset@arcradius#1{%
+ \dim@x=#1\unitlength \edef\arc@radius{\strip@PT\dim@x}}%
+\def\gasset@polyangle#1{\edef\poly@angle{#1}}%
+
+%-----------------------------------------------------------------------
+% Default settings
+\unitlength=1mm
+\gasset{Nw=8,Nh=8,Nmr=4} % circle
+\gasset{Nframe=y}
+\gasset{fillgray=0,Nfill=n} % Not filled but black if filled
+\gasset{ExtNL=n,NLangle=90,NLdist=0}
+\gasset{iangle=180,ilength=5}
+\gasset{fangle=0,flength=5}
+\gasset{rdist=0.7}
+\gasset{Nmarks=n} % no mark
+\gasset{Nadjustdist=1,Nadjust=n} % no adjust
+\gasset{sxo=0,syo=0,exo=0,eyo=0}
+\gasset{curvedepth=0}
+\gasset{loopdiam=8,loopangle=90,loopCW=y}
+% One triangular small arrowhead
+\gasset{AHnb=1,AHdist=1.41,AHangle=20,AHLength=1.5,AHlength=1.41}
+\gasset{ATnb=0,ATdist=1.41,ATangle=20,ATLength=1.5,ATlength=1.41}
+\gasset{ELside=l,ELpos=50,ELdist=1}
+\gasset{linegray=0} % black lines
+\gasset{linewidth=0.14,dash={}0} % continuous path
+\gasset{arcradius=0,polyangle=0} % sharp angles
+
+% Settings for slides
+\ifgastexslide
+ \gasset{Nw=12,Nh=12,Nmr=6,ilength=8,flength=8,rdist=1,loopdiam=12}
+ \gasset{linewidth=0.21,AHdist=2.1,AHLength=2.25,AHlength=2.1}
+ \gasset{ATdist=2.1,ATLength=2.25,ATlength=2.1}
+\fi
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Nodes
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%-----------------------------------------------------------------------
+% Define and draw a node whose shape is a regular polygon.
+%
+% \rpnode(NodeName)(x,y)(n,r){NodeLabel}
+% \rpnode[parameter=value,...](NodeName)(x,y)(n,r){NodeLabel}
+%
+% Required arguments:
+% NodeName : name of the node
+% x,y : coordinates in \unitlengh of the node (center of the polygon).
+% n : number of sides of the polygon.
+% r : radius in \unitlengh of the circle containing the polygon.
+% NodeLabel : label of the node. Empty if no label.
+% Optional argument: (in particular, polyangle and arcradius)
+% [parameter=value,...]
+% One may just define a node without drawing it using an empty label
+% and the parameters Nframe=n,Nfill=n
+\def\rpnode#1(#2)(#3)(#4)#5{{%
+ \@ifnextchar[{\process@rpnodeopt}{\rp@node}#1(#2)(#3)(#4){#5}}}
+\def\process@rpnodeopt[#1]{\gas@set#1,&\rp@node}%
+\def\rp@node(#1)(#2,#3)(#4,#5)#6{{%
+% The value -1 assigned to node@#1@w characterizes polygonal nodes
+ \global\expandafter\edef\csname node@#1@w\endcsname{-1}%
+ \setcounter{cnt@a}{1*\ratio{#2\unitlength}{\d@my@unit}}
+ \global\expandafter\edef\csname node@#1@x\endcsname{\thecnt@a}%
+ \setcounter{cnt@a}{1*\ratio{#3\unitlength}{\d@my@unit}}
+ \global\expandafter\edef\csname node@#1@y\endcsname{\thecnt@a}%
+ \global\expandafter\edef\csname node@#1@n\endcsname{#4}%
+ \setcounter{cnt@a}{1*\ratio{#5\unitlength}{\d@my@unit}}
+ \global\expandafter\edef\csname node@#1@rad\endcsname{\thecnt@a}%
+ \global\expandafter\edef\csname node@#1@a\endcsname{\poly@angle}%
+% Definition of the polygonal path for the node
+ \dim@x=\csname node@#1@x\endcsname\d@my@unit
+ \dim@y=\csname node@#1@y\endcsname\d@my@unit
+ \edef\ps@path{\strip@PT\dim@x\strip@PT\dim@y\csname node@#1@n\endcsname\space}%
+ \dim@x=\csname node@#1@rad\endcsname\d@my@unit
+ \edef\ps@path{\ps@path \strip@PT\dim@x \csname node@#1@a\endcsname\space}%
+ \edef\ps@path{\ps@path \arc@radius 0 !psrpolygonpath\space}%
+ \global\expandafter\edef\csname node@#1@path\endcsname{\ps@path}%
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color \csname node@#1@path\endcsname fill
+ \fi
+ \if@frame
+ \line@color \csname node@#1@path\endcsname stroke
+ \fi
+ }}
+ \if@imark \imark(#1) \fi
+ \if@fmark \fmark(#1) \fi
+ \if@rmark \rmark(#1) \fi
+% \@ExtNLfalse
+ \nodelabel(#1){#6}
+}}
+
+%-----------------------------------------------------------------------
+% Define and draw a node.
+%
+% \node(NodeName)(x,y){NodeLabel}
+% \node[parameter=value,...](NodeName)(x,y){NodeLabel}
+%
+% Required arguments:
+% NodeName : name of the node
+% (x,y) : coordinates of the node in \unitlengh.
+% NodeLabel : label of the node. Empty if no label.
+% Optional argument:
+% [parameter=value,...]
+% One may just define a node without drawing it using an empty label
+% and the parameters Nframe=n,Nfill=n
+\def\node#1(#2)(#3,#4)#5{{%
+ \@ifnextchar[{\process@nodeopt}{\i@node}#1(#2)(#3,#4){#5}}}
+\def\process@nodeopt[#1]{\gas@set#1,&\i@node}%
+\def\i@node(#1)(#2,#3)#4{%
+ \let@node(#1)(#2,#3){#4}\draw@node(#1){#4}}
+
+%-----------------------------------------------------------------------
+% Define a node without drawing it.
+% Internal macro also used in \compatiblegastexun.
+%
+% \let@node(NodeName)(x,y){NodeLabel}
+%
+% Required arguments:
+% NodeName : name of the node
+% x,y : coordinates of the node in \unitlengh.
+% NodeLabel : label of the node. Empty if no label.
+\def\let@node(#1)(#2,#3)#4{{%
+% width and height of the box containing #4
+ \setbox\temp@box\hbox{\selectfont #4}
+ \if@wadjust
+ \setcounter{cnt@a}{\N@adjustdist + \wd\temp@box / \d@my@unit}
+ \edef\N@w{\thecnt@a}%
+ \fi
+ \if@hadjust
+ \setcounter{cnt@a}{\N@adjustdist + (\ht\temp@box+\dp\temp@box) / \d@my@unit}
+ \edef\N@h{\thecnt@a}%
+ \fi
+ \global\expandafter\edef\csname node@#1@w\endcsname{\N@w}%
+ \global\expandafter\edef\csname node@#1@h\endcsname{\N@h}%
+ \ifnum\N@h<\N@w
+ \setcounter{cnt@a}{\N@h/2}
+ \else
+ \setcounter{cnt@a}{\N@w/2}
+ \fi
+ \ifnum\N@mr<\thecnt@a\setcounter{cnt@a}{\N@mr}\fi
+ \global\expandafter\edef\csname node@#1@r\endcsname{\thecnt@a}%
+ \setcounter{cnt@a}{1*\ratio{#2\unitlength}{\d@my@unit}}
+ \global\expandafter\edef\csname node@#1@x\endcsname{\thecnt@a}%
+ \setcounter{cnt@a}{1*\ratio{#3\unitlength}{\d@my@unit}}
+ \global\expandafter\edef\csname node@#1@y\endcsname{\thecnt@a}%
+% Definition of the oval path for the node
+ \dim@x=#2\unitlength \edef\ps@path{\strip@PT\dim@x}%
+ \dim@x=#3\unitlength \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=\N@w\d@my@unit \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=\N@h\d@my@unit \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=\N@mr\d@my@unit \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \edef\ps@path{\ps@path !psovalpath\space}%
+ \global\expandafter\edef\csname node@#1@path\endcsname{\ps@path}%
+}}
+
+%-----------------------------------------------------------------------
+% Draw a node which is already defined. Internal macro.
+%
+% \draw@node(NodeName){NodeLabel}
+%
+% Required arguments:
+% NodeName : name of the node
+% NodeLabel : label of the node. Empty if no label.
+\def\draw@node(#1)#2{{%
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color \csname node@#1@path\endcsname fill
+ \fi
+ \if@frame
+ \line@color \csname node@#1@path\endcsname stroke
+ \fi
+ }}
+ \if@imark \imark(#1) \fi
+ \if@fmark \fmark(#1) \fi
+ \if@rmark \rmark(#1) \fi
+ \nodelabel(#1){#2}
+}}
+
+%-----------------------------------------------------------------------
+% Add an ingoing arrow to mark an initial node.
+% This arrow is usually drawn by \node using Nmarks=i.
+% This separate macro can be used to draw several arrows
+% or arrows with different colors, thickness, dash, ...
+%
+% \imark(NodeName)
+% \imark[parameter=value,...](NodeName)
+%
+% Required arguments:
+% NodeName : name of the node
+% Optional argument:
+% [parameter=value,...]
+\def\imark#1(#2){{%
+ \@ifnextchar[{\process@imarkopt}{\i@mark}#1(#2)}}
+\def\process@imarkopt[#1]{\gas@set#1,&\i@mark}%
+\def\i@mark(#1){{%
+ \dim@x=\csname node@#1@x\endcsname\d@my@unit \edef\ps@par{\strip@PT\dim@x}%
+ \dim@x=\csname node@#1@y\endcsname\d@my@unit \edef\ps@par{\ps@par \strip@PT\dim@x}%
+ \dim@x=\i@length\d@my@unit \edef\ps@par{\ps@par \strip@PT\dim@x \i@angle\space}%
+ \put(0,0){\special{" \gas@initps \line@color
+% Path around the node
+ \csname node@#1@path\endcsname /path!a false upath cvlit def
+ \gas@ATnul \gas@AHparam \ps@par !node_mark}}
+}}
+
+%-----------------------------------------------------------------------
+% Add an outgoing arrow to mark a final node.
+% This arrow is usually drawn by \node using Nmarks=f.
+% This separate macro can be used to draw several arrows
+% or arrows with different colors, thickness, dash, ...
+%
+% \fmark(NodeName)
+% \fmark[parameter=value,...](NodeName)
+%
+% Required arguments:
+% NodeName : name of the node
+% Optional argument:
+% [parameter=value,...]
+\def\fmark#1(#2){{%
+ \@ifnextchar[{\process@fmarkopt}{\f@mark}#1(#2)}}
+\def\process@fmarkopt[#1]{\gas@set#1,&\f@mark}%
+\def\f@mark(#1){{%
+ \dim@x=\csname node@#1@x\endcsname\d@my@unit \edef\ps@par{\strip@PT\dim@x}%
+ \dim@x=\csname node@#1@y\endcsname\d@my@unit \edef\ps@par{\ps@par \strip@PT\dim@x}%
+ \dim@x=\f@length\d@my@unit \edef\ps@par{\ps@par \strip@PT\dim@x \f@angle\space}%
+ \put(0,0){\special{" \gas@initps \line@color
+% Path around the node
+ \csname node@#1@path\endcsname /path!a false upath cvlit def
+ \gas@AHparam \gas@ATnul \ps@par !node_mark}}
+}}
+
+%-----------------------------------------------------------------------
+% Add a second line to mark a repeated node.
+% This line is usually drawn by \node using Nmarks=r.
+% This separate macro can be used to draw several lines around the
+% node or lines with different colors, thickness, dash, ...
+%
+% \rmark(NodeName)
+% \rmark[parameter=value,...](NodeName)
+%
+% Required arguments:
+% NodeName : name of the node
+% Optional argument:
+% [parameter=value,...]
+\def\rmark#1(#2){{%
+ \@ifnextchar[{\process@rmarkopt}{\r@mark}#1(#2)}}
+\def\process@rmarkopt[#1]{\gas@set#1,&\r@mark}%
+\def\r@mark(#1){{%
+ \ifnum\csname node@#1@w\endcsname=-1 % then it's a polygonal node
+ \dim@x=\csname node@#1@x\endcsname\d@my@unit
+ \edef\ps@path{\strip@PT\dim@x}%
+ \dim@x=\csname node@#1@y\endcsname\d@my@unit
+ \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \edef\ps@path{\ps@path \csname node@#1@n\endcsname\space}%
+ \dim@x=\csname node@#1@rad\endcsname\d@my@unit
+ \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \edef\ps@path{\ps@path \csname node@#1@a\endcsname\space}%
+ \dim@y=\rep@dist\d@my@unit
+ \edef\ps@path{\ps@path \arc@radius \strip@PT\dim@y !psrpolygonpath\space}%
+ \put(0,0){\special{" \gas@initps \line@color \ps@path stroke}}
+ \else % it's an oval node
+ \dim@x=\csname node@#1@x\endcsname\d@my@unit
+ \edef\ps@path{\strip@PT\dim@x}%
+ \dim@x=\csname node@#1@y\endcsname\d@my@unit
+ \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@y=-\rep@dist\d@my@unit
+ \dim@x=\csname node@#1@w\endcsname\d@my@unit
+ \advance\dim@x\dim@y\advance\dim@x\dim@y
+ \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=\csname node@#1@h\endcsname\d@my@unit
+ \advance\dim@x\dim@y\advance\dim@x\dim@y
+ \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=\csname node@#1@r\endcsname\d@my@unit
+ \advance\dim@x\dim@y
+ \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \put(0,0){\special{" \gas@initps \line@color \ps@path !psovalpath stroke}}
+ \fi
+}}
+
+%-----------------------------------------------------------------------
+% Add a label to the node.
+% The position of the label is determined by the ExtNL flag
+% and the parameters NLangle and NLdist.
+% The label is usually drawn by \node.
+% This separate macro can be used to add several labels
+%
+% \nodelabel(NodeName){NodeLabel}
+% \nodelabel[parameter=value,...](NodeName){NodeLabel}
+%
+% Required arguments:
+% NodeName : name of the node
+% NodeLabel : label of the node.
+% Optional argument:
+% [parameter=value,...]
+\newif\if@cosneg \newif\if@sinneg
+\def\nodelabel#1(#2)#3{{%
+ \@ifnextchar[{\process@nodelabelopt}{\node@label}#1(#2){#3}}}
+\def\process@nodelabelopt[#1]{\gas@set#1,&\node@label}%
+\def\node@label(#1)#2{{%
+ \unitlength=\d@my@unit
+ \edef\cs@x{\csname node@#1@x\endcsname}%
+ \edef\cs@y{\csname node@#1@y\endcsname}%
+ \if@ExtNL
+ \node@diam(#1,\NL@angle)
+ \setcounter{cnt@a}{\cs@nd/2}\edef\cs@nr{\thecnt@a}%
+% width and height of the box containing #2
+ \setbox\temp@box\hbox{\selectfont #2}
+ \setcounter{cnt@a}{\wd\temp@box / \d@my@unit}
+ \edef\cs@bw{\thecnt@a}%
+ \setcounter{cnt@a}{(\ht\temp@box+\dp\temp@box) / \d@my@unit}
+ \edef\cs@bh{\thecnt@a}%
+%
+ \@cosnegfalse \@sinnegfalse
+ \dim@x=\cs@cos pt \ifnum \dim@x<0 \@cosnegtrue \dim@x=-\dim@x \fi
+ \edef\cs@abscos{\strip@PT\dim@x}%
+ \dim@x=\cs@sin pt \ifnum \dim@x<0 \@sinnegtrue \dim@x=-\dim@x \fi
+ \edef\cs@abssin{\strip@PT\dim@x}%
+%
+ \ifnum\csname node@#1@w\endcsname=-1 % then it's a polygonal node
+ \setcounter{cnt@c}{\cs@nr+\NL@dist+%
+ (\cs@bw*\real{\cs@abscos}+\cs@bh*\real{\cs@abssin})/2}
+ \setcounter{cnt@a}{\cs@x+\thecnt@c*\real{\cs@cos}}
+ \setcounter{cnt@b}{\cs@y+\thecnt@c*\real{\cs@sin}}
+ \put(\thecnt@a,\thecnt@b){\makebox(0,0){\selectfont #2}}
+ \else % it's an oval node
+ \setcounter{cnt@a}{((\cs@h+\cs@bh)/2+\NL@dist)*\real{\cs@abscos}}
+ \setcounter{cnt@b}{((\cs@w+\cs@bw)/2-\cs@r)*\real{\cs@abssin}}
+ \ifnum\thecnt@a<\thecnt@b
+ \setcounter{cnt@c}{(\cs@h+\cs@bh)/2+\NL@dist}
+ \if@sinneg \setcounter{cnt@c}{-\thecnt@c} \fi
+ \setcounter{cnt@a}{\cs@x+\thecnt@c*\real{\cs@cos}/\real{\cs@sin}}
+ \setcounter{cnt@b}{\cs@y+\thecnt@c}
+ \put(\thecnt@a,\thecnt@b){\makebox(0,0){\selectfont #2}}
+ \else
+ \setcounter{cnt@a}{((\cs@w+\cs@bw)/2+\NL@dist)*\real{\cs@abssin}}
+ \setcounter{cnt@b}{((\cs@h+\cs@bh)/2-\cs@r)*\real{\cs@abscos}}
+ \ifnum\thecnt@a<\thecnt@b
+ \setcounter{cnt@c}{(\cs@w+\cs@bw)/2+\NL@dist}
+ \if@cosneg \setcounter{cnt@c}{-\thecnt@c} \fi
+ \setcounter{cnt@a}{\cs@x+\thecnt@c}
+ \setcounter{cnt@b}{\cs@y+\thecnt@c*\real{\cs@sin}/\real{\cs@cos}}
+ \put(\thecnt@a,\thecnt@b){\makebox(0,0){\selectfont #2}}
+ \else
+ % auxiliary parameters
+ \setcounter{cnt@a}{\cs@r-(\cs@w+\cs@bw)/2}
+ \edef\cs@xx{\thecnt@a}%
+ \setcounter{cnt@a}{\cs@r-(\cs@h+\cs@bh)/2}
+ \edef\cs@yy{\thecnt@a}%
+ \setcounter{cnt@a}{(\cs@r+\NL@dist)*(\cs@r+\NL@dist)}
+ \edef\cs@lim{\thecnt@a}%
+ \def\cs@tmin{0}%
+ \setcounter{cnt@a}{\NL@dist+(\cs@bw+\cs@bh)/2}
+ \edef\cs@tmax{\thecnt@a}%
+ % computation of the center of the label
+ \setcounter{cnt@c}{10}
+ \@whilenum\thecnt@c>0\do{
+ \setcounter{cnt@a}{(\cs@tmin+\cs@tmax)/2}
+ \edef\cs@t{\thecnt@a}%
+ \setcounter{cnt@a}{(\cs@nr+\cs@t)*\real{\cs@abscos}+\cs@xx}
+ \setcounter{cnt@b}{(\cs@nr+\cs@t)*\real{\cs@abssin}+\cs@yy}
+ \setcounter{cnt@a}{\thecnt@a*\thecnt@a + \thecnt@b*\thecnt@b}
+ \ifnum\thecnt@a<\cs@lim
+ \edef\cs@tmin{\cs@t}%
+ \else
+ \edef\cs@tmax{\cs@t}%
+ \fi
+ \addtocounter{cnt@c}{-1}}
+ \setcounter{cnt@a}{\cs@x+(\cs@nr+\cs@t)*\real{\cs@cos}}
+ \setcounter{cnt@b}{\cs@y+(\cs@nr+\cs@t)*\real{\cs@sin}}
+ \put(\thecnt@a,\thecnt@b){\makebox(0,0){\selectfont #2}}
+ \fi
+ \fi
+ \fi
+ \else % regular node label
+ \CalculateCos{\NL@angle} \edef\cs@cos{\UseCos{\NL@angle}}%
+ \CalculateSin{\NL@angle} \edef\cs@sin{\UseSin{\NL@angle}}%
+ \setcounter{cnt@a}{\cs@x+\NL@dist*\real{\cs@cos}}
+ \setcounter{cnt@b}{\cs@y+\NL@dist*\real{\cs@sin}}
+ \put(\thecnt@a,\thecnt@b){\makebox(0,0){\selectfont #2}}
+ \fi
+}}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Edges
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%-----------------------------------------------------------------------
+% Edge between two nodes.
+%
+% \drawedge(startingNode,endingNode){label}
+% \drawedge[parameter=value,...](startingNode,endingNode){label}
+%
+% Required arguments:
+% startingNode : name of the starting node,
+% endingNode : name of the ending node,
+% label : label of the edge. {} for no label.
+% Optional argument:
+% [parameter=value,...]
+\def\drawedge#1(#2)#3{{%
+ \@ifnextchar[{\process@edgeopt}{\draw@edge}#1(#2){#3}}}
+\def\process@edgeopt[#1]{\gas@set#1,&\draw@edge}%
+\def\draw@edge(#1,#2)#3{%
+% Control points of the cubic Bezier curve
+ \setcounter{cnt@a}{\csname node@#1@x\endcsname + \E@sxo}%
+ \edef\cs@xa{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#1@y\endcsname + \E@syo}%
+ \edef\cs@ya{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#2@x\endcsname + \E@exo}%
+ \edef\cs@xd{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#2@y\endcsname + \E@eyo}%
+ \edef\cs@yd{\thecnt@a}%
+ \setcounter{cnt@a}{\cs@xd-\cs@xa}
+ \setcounter{cnt@b}{\cs@yd-\cs@ya}
+ \setcounter{cnt@c}{\thecnt@a*\thecnt@a+\thecnt@b*\thecnt@b}
+ \ifnum\thecnt@c=0
+ \PackageError{gastex}{drawedge(#1,#2)}{}
+ \typeout{The starting and ending nodes should not have the same coordinates.}
+ \else
+ \gas@sqrt{\thecnt@c}
+ \setcounter{cnt@b}{\cs@xa+\cs@xd-4*\curve@depth*(\cs@yd-\cs@ya)/\the@sqrt}
+ \setcounter{cnt@a}{(\thecnt@b+\cs@xa)/3}\edef\cs@xb{\thecnt@a}%
+ \setcounter{cnt@a}{(\thecnt@b+\cs@xd)/3}\edef\cs@xc{\thecnt@a}%
+ \setcounter{cnt@b}{\cs@ya+\cs@yd+4*\curve@depth*(\cs@xd-\cs@xa)/\the@sqrt}
+ \setcounter{cnt@a}{(\thecnt@b+\cs@ya)/3}\edef\cs@yb{\thecnt@a}%
+ \setcounter{cnt@a}{(\thecnt@b+\cs@yd)/3}\edef\cs@yc{\thecnt@a}%
+ \unitlength=\d@my@unit
+ \draw@b@edge(#1,#2){#3}
+ \fi
+}
+
+%-----------------------------------------------------------------------
+% Edge between two nodes following a quadratic Bezier curve.
+% The first and last control points are the centers of the starting
+% and ending nodes resp, modified with the starting and ending offsets.
+% The middle control point is given by its absolute cartesian coordinates
+%
+% \drawqbedge(startingNode,x,y,endingNode){label}
+% \drawqbedge[parameter=value,...](startingNode,x,y,endingNode){label}
+%
+% Required arguments:
+% startingNode : name of the starting node,
+% x,y : coordinates in \unitlength of the intermediary control point
+% endingNode : name of the ending node,
+% label : label of the edge. {} for no label.
+% Optional argument:
+% [parameter=value,...]
+\def\drawqbedge#1(#2)#3{{%
+ \@ifnextchar[{\process@qbedgeopt}{\draw@qbedge}#1(#2){#3}}}
+\def\process@qbedgeopt[#1]{\gas@set#1,&\draw@qbedge}%
+\def\draw@qbedge(#1,#2,#3,#4)#5{%
+% Control points of the cubic Bezier curve
+ \setcounter{cnt@a}{\csname node@#1@x\endcsname + \E@sxo}%
+ \edef\cs@xa{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#1@y\endcsname + \E@syo}%
+ \edef\cs@ya{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#4@x\endcsname + \E@exo}%
+ \edef\cs@xd{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#4@y\endcsname + \E@eyo}%
+ \edef\cs@yd{\thecnt@a}%
+ \setcounter{cnt@b}{2*\ratio{#2\unitlength}{\d@my@unit}}
+ \setcounter{cnt@a}{(\cs@xa+\thecnt@b)/3}\edef\cs@xb{\thecnt@a}%
+ \setcounter{cnt@a}{(\cs@xd+\thecnt@b)/3}\edef\cs@xc{\thecnt@a}%
+ \setcounter{cnt@b}{2*\ratio{#3\unitlength}{\d@my@unit}}
+ \setcounter{cnt@a}{(\cs@ya+\thecnt@b)/3}\edef\cs@yb{\thecnt@a}%
+ \setcounter{cnt@a}{(\cs@yd+\thecnt@b)/3}\edef\cs@yc{\thecnt@a}%
+ \unitlength=\d@my@unit
+ \draw@b@edge(#1,#4){#5}
+}
+
+%-----------------------------------------------------------------------
+% Edge between two nodes following a quadratic Bezier curve.
+% The first and last control points are the centers of the starting
+% and ending nodes resp, modified with the starting and ending offsets.
+% The middle control point is defined by two angles.
+%
+% \drawqbpedge(startingNode,sa,endingNode,ea){label}
+% \drawqbpedge[parameter=value,...](startingNode,sa,endingNode,ea){label}
+%
+% Required arguments:
+% startingNode : name of the starting node,
+% endingNode : name of the ending node,
+% sa,ea : angles in degree at the starting and ending nodes,
+% these angles define intermediary control point
+% label : label of the edge. {} for no label.
+% Optional argument:
+% [parameter=value,...]
+\def\drawqbpedge#1(#2)#3{{%
+ \@ifnextchar[{\process@qbpedgeopt}{\draw@qbpedge}#1(#2){#3}}}
+\def\process@qbpedgeopt[#1]{\gas@set#1,&\draw@qbpedge}%
+\def\draw@qbpedge(#1,#2,#3,#4)#5{%
+% Control points of the cubic Bezier curve
+ \setcounter{cnt@a}{\csname node@#1@x\endcsname + \E@sxo}%
+ \edef\cs@xa{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#1@y\endcsname + \E@syo}%
+ \edef\cs@ya{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#3@x\endcsname + \E@exo}%
+ \edef\cs@xd{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#3@y\endcsname + \E@eyo}%
+ \edef\cs@yd{\thecnt@a}%
+ \edef\cs@sangle{#2}%
+ \CalculateCos\cs@sangle \CalculateSin\cs@sangle
+ \edef\cs@eangle{#4}%
+ \CalculateCos\cs@eangle \CalculateSin\cs@eangle
+ \setcounter{cnt@a}{1000*\real{\UseCos\cs@sangle}*\real{\UseSin\cs@eangle}
+ -1000*\real{\UseSin\cs@sangle}*\real{\UseCos\cs@eangle}}
+ \ifnum\thecnt@a=0
+ \PackageError{gastex}{drawqbpedge(#1,#2,#3,#4)}{}
+ \typeout{The angles do not allow to compute the intersection point.}
+ \else
+ \setcounter{cnt@c}{((\cs@xd-\cs@xa)*1000*\real{\UseSin\cs@eangle}
+ -(\cs@yd-\cs@ya)*1000*\real{\UseCos\cs@eangle})
+ /\thecnt@a}
+ \setcounter{cnt@b}{2*(\cs@xa+\thecnt@c*\real{\UseCos\cs@sangle})}
+ \setcounter{cnt@a}{(\cs@xa+\thecnt@b)/3}\edef\cs@xb{\thecnt@a}%
+ \setcounter{cnt@a}{(\cs@xd+\thecnt@b)/3}\edef\cs@xc{\thecnt@a}%
+ \setcounter{cnt@b}{2*(\cs@ya+\thecnt@c*\real{\UseSin\cs@sangle})}
+ \setcounter{cnt@a}{(\cs@ya+\thecnt@b)/3}\edef\cs@yb{\thecnt@a}%
+ \setcounter{cnt@a}{(\cs@yd+\thecnt@b)/3}\edef\cs@yc{\thecnt@a}%
+ \unitlength=\d@my@unit
+ \draw@b@edge(#1,#3){#5}
+ \fi
+}
+
+%-----------------------------------------------------------------------
+% Edge between two nodes following a cubic Bezier curve.
+% The first and last control points are the centers of the starting
+% and ending nodes resp, modified with the starting and ending offsets.
+% The second and third control points are given by their polar coordinates
+% relative to the first and last control points resp.
+%
+% \drawbpedge(startingNode,sa,sr,endingNode,ea,er){label}
+% \drawbpedge[parameter=value,...](startingNode,sa,sr,endingNode,ea,er){label}
+%
+% Required arguments:
+% startingNode : name of the starting node,
+% sa,sr : polar coordinates of the second control point relative to the
+% first control point (angle in degree and radius in \unitlength)
+% endingNode : name of the ending node,
+% ea,er : polar coordinates of the third control point relative to the
+% last control point (angle in degree and radius in \unitlength)
+% label : label of the edge. {} for no label.
+% Optional argument:
+% [parameter=value,...]
+\def\drawbpedge#1(#2)#3{{%
+ \@ifnextchar[{\process@bpedgeopt}{\draw@bpedge}#1(#2){#3}}}
+\def\process@bpedgeopt[#1]{\gas@set#1,&\draw@bpedge}%
+\def\draw@bpedge(#1,#2,#3,#4,#5,#6)#7{%
+% Control points of the cubic Bezier curve
+ \setcounter{cnt@a}{\csname node@#1@x\endcsname + \E@sxo}%
+ \edef\cs@xa{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#1@y\endcsname + \E@syo}%
+ \edef\cs@ya{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#4@x\endcsname + \E@exo}%
+ \edef\cs@xd{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#4@y\endcsname + \E@eyo}%
+ \edef\cs@yd{\thecnt@a}%
+ \setcounter{cnt@b}{1*\ratio{#3\unitlength}{\d@my@unit}}
+ \edef\cs@angle{#2}%
+ \CalculateCos\cs@angle \CalculateSin\cs@angle
+ \setcounter{cnt@a}{\cs@xa+\thecnt@b*\real{\UseCos\cs@angle}}
+ \edef\cs@xb{\thecnt@a}%
+ \setcounter{cnt@a}{\cs@ya+\thecnt@b*\real{\UseSin\cs@angle}}
+ \edef\cs@yb{\thecnt@a}%
+ \setcounter{cnt@b}{1*\ratio{#6\unitlength}{\d@my@unit}}
+ \edef\cs@angle{#5}%
+ \CalculateCos\cs@angle \CalculateSin\cs@angle
+ \setcounter{cnt@a}{\cs@xd+\thecnt@b*\real{\UseCos\cs@angle}}
+ \edef\cs@xc{\thecnt@a}%
+ \setcounter{cnt@a}{\cs@yd+\thecnt@b*\real{\UseSin\cs@angle}}
+ \edef\cs@yc{\thecnt@a}%
+ \unitlength=\d@my@unit
+ \draw@b@edge(#1,#4){#7}
+}
+
+%-----------------------------------------------------------------------
+% Edge between two nodes following a cubic Bezier curve.
+% The first and last control points are the centers of the starting
+% and ending nodes resp, modified with the starting and ending offsets.
+% The second and third control points are given by their absolute
+% cartesian coordinates.
+%
+% \drawbcedge(startingNode,xs,ys,endingNode,xe,ye){label}
+% \drawbcedge[parameter=value,...](startingNode,xs,ys,endingNode,xe,ye){label}
+%
+% Required arguments:
+% startingNode : name of the starting node,
+% xs,ys : coordinates in \unitlength of the control point defining
+% the tangent at the starting node
+% endingNode : name of the ending node,
+% xe,ye : coordinates in \unitlength of the control point defining
+% the tangent at the ending node
+% label : label of the edge. {} for no label.
+% Optional argument:
+% [parameter=value,...]
+\def\drawbcedge#1(#2)#3{{%
+ \@ifnextchar[{\process@bcedgeopt}{\draw@bcedge}#1(#2){#3}}}
+\def\process@bcedgeopt[#1]{\gas@set#1,&\draw@bcedge}%
+\def\draw@bcedge(#1,#2,#3,#4,#5,#6)#7{%
+% Control points of the cubic Bezier curve
+ \setcounter{cnt@a}{\csname node@#1@x\endcsname + \E@sxo}%
+ \edef\cs@xa{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#1@y\endcsname + \E@syo}%
+ \edef\cs@ya{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#4@x\endcsname + \E@exo}%
+ \edef\cs@xd{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#4@y\endcsname + \E@eyo}%
+ \edef\cs@yd{\thecnt@a}%
+ \setcounter{cnt@a}{1*\ratio{#2\unitlength}{\d@my@unit}}
+ \edef\cs@xb{\thecnt@a}%
+ \setcounter{cnt@a}{1*\ratio{#3\unitlength}{\d@my@unit}}
+ \edef\cs@yb{\thecnt@a}%
+ \setcounter{cnt@a}{1*\ratio{#5\unitlength}{\d@my@unit}}
+ \edef\cs@xc{\thecnt@a}%
+ \setcounter{cnt@a}{1*\ratio{#6\unitlength}{\d@my@unit}}
+ \edef\cs@yc{\thecnt@a}%
+ \unitlength=\d@my@unit
+ \draw@b@edge(#1,#4){#7}
+}
+
+%-----------------------------------------------------------------------
+% Loop on a node following a cubic Bezier curve.
+% Only the starting offsets sxo and syo are used.
+%
+% \drawloop(Node){label}
+% \drawloop[parameter=value,...](Node){label}
+%
+% Required arguments:
+% Node : name of the node,
+% label : label of the edge. {} for no label.
+% Optional argument:
+% [parameter=value,...]
+\def\drawloop#1(#2)#3{{%
+ \@ifnextchar[{\process@loopopt}{\draw@loop}#1(#2){#3}}}
+\def\process@loopopt[#1]{\gas@set#1,&\draw@loop}%
+\def\draw@loop(#1)#2{%
+% Control points of the cubic Bezier curve
+ \unitlength=\d@my@unit
+ \setcounter{cnt@a}{\csname node@#1@x\endcsname + \E@sxo}%
+ \edef\cs@xa{\thecnt@a}%
+ \setcounter{cnt@a}{\csname node@#1@y\endcsname + \E@syo}%
+ \edef\cs@ya{\thecnt@a}%
+ \edef\cs@xd{\cs@xa}%
+ \edef\cs@yd{\cs@ya}%
+ \node@diam(#1,\loop@angle)
+ \setcounter{cnt@a}{2*(\cs@nd+2*\loop@diam)/3}
+ \setcounter{cnt@b}{\loop@diam*1732/1000} % approx of sqrt(3)
+% Rotation
+ \setcounter{cnt@c}
+ {\cs@xa+\thecnt@a*\real{\cs@cos}-\thecnt@b*\real{\cs@sin}}
+ \if@loopCW
+ \edef\cs@xb{\thecnt@c}%
+ \else
+ \edef\cs@xc{\thecnt@c}%
+ \fi
+ \setcounter{cnt@c}
+ {\cs@xa+\thecnt@a*\real{\cs@cos}+\thecnt@b*\real{\cs@sin}}
+ \if@loopCW
+ \edef\cs@xc{\thecnt@c}%
+ \else
+ \edef\cs@xb{\thecnt@c}%
+ \fi
+ \setcounter{cnt@c}
+ {\cs@ya+\thecnt@a*\real{\cs@sin}+\thecnt@b*\real{\cs@cos}}
+ \if@loopCW
+ \edef\cs@yb{\thecnt@c}%
+ \else
+ \edef\cs@yc{\thecnt@c}%
+ \fi
+ \setcounter{cnt@c}
+ {\cs@ya+\thecnt@a*\real{\cs@sin}-\thecnt@b*\real{\cs@cos}}
+ \if@loopCW
+ \edef\cs@yc{\thecnt@c}%
+ \else
+ \edef\cs@yb{\thecnt@c}%
+ \fi
+ \draw@b@edge(#1,#1){#2}
+}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Other macros
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%-----------------------------------------------------------------------
+% Draw a broken line defined by n points (n>1).
+% The line may have arrowhead(s), arrowtail(s), color, ...
+% depending of the current settings
+%
+% \drawline(x1,y1)...(xn,yn)
+% \drawline[parameter=value,...](x1,y1)...(xn,yn)
+%
+% Required arguments in \unitlengh:
+% (x1,y1)...(xn,yn) : coordinates of the points.
+% Optional argument:
+% [parameter=value,...]
+\def\drawline#1(#2){\begingroup%
+ \setcounter{cnt@a}{0} \edef\ps@param{}%
+ \@ifnextchar[{\process@drawlineopt}{\draw@line}#1(#2)}
+\def\process@drawlineopt[#1]{\gas@set#1,&\draw@line}%
+\def\draw@line(#1,#2){%
+ \setcounter{cnt@a}{\thecnt@a+1}
+ \dim@x=#1\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \@ifnextchar({\draw@line}{
+ \put(0,0){\special{" \gas@initps \line@color
+ \gas@ATparam \gas@AHparam \ps@param \thecnt@a\space \arc@radius !pslines}}
+ \endgroup
+ }}
+
+%-----------------------------------------------------------------------
+% Draw a circle.
+%
+% \drawcircle(x,y,r)
+% \drawcircle[parameter=value,...](x,y,d)
+%
+% Required arguments in \unitlengh:
+% x,y : coordinates of the circle center.
+% d : diameter of the circle.
+% Optional argument:
+% [parameter=value,...]
+\def\drawcircle#1(#2){{%
+ \@ifnextchar[{\process@circleopt}{\draw@circle}#1(#2)}}
+\def\process@circleopt[#1]{\gas@set#1,&\draw@circle}%
+\def\draw@circle(#1,#2,#3){{%
+ \dim@x=#1\unitlength \edef\ps@x{\strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@y{\strip@PT\dim@x}%
+ \dim@x=#3\unitlength \edef\ps@d{\strip@PT\dim@x}%
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color
+ \ps@x \ps@y \ps@d 2 div !pscirclepath fill
+ \fi
+ \if@frame
+ \line@color
+ \ps@x \ps@y \ps@d 2 div !pscirclepath stroke
+ \fi
+ }}
+}}
+
+%-----------------------------------------------------------------------
+% Draw a rectangle.
+%
+% \drawrect(x0,y0,x1,y1)
+% \drawrect[parameter=value,...](x0,y0,x1,y1)
+%
+% Required arguments in \unitlengh:
+% x0,y0 : coordinates of the lower left corner of the rectangle.
+% x1,y1 : coordinates of the upper right corner of the rectangle.
+% Optional argument:
+% [parameter=value,...]
+\def\drawrect#1(#2){{%
+ \@ifnextchar[{\process@rectopt}{\draw@rect}#1(#2)}}
+\def\process@rectopt[#1]{\gas@set#1,&\draw@rect}%
+\def\draw@rect(#1,#2,#3,#4){{%
+ \dim@x=#1\unitlength \edef\ps@x{\strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@y{\strip@PT\dim@x}%
+ \dim@x=#3\unitlength \edef\ps@a{\strip@PT\dim@x}%
+ \dim@x=#4\unitlength \edef\ps@b{\strip@PT\dim@x}%
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color
+ \ps@x \ps@y \ps@a \ps@b !psrectpath fill
+ \fi
+ \if@frame
+ \line@color
+ \ps@x \ps@y \ps@a \ps@b !psrectpath stroke
+ \fi
+ }}
+}}
+
+%-----------------------------------------------------------------------
+% Draw an oval.
+%
+% \drawoval(x,y,w,h,mr)
+% \drawoval[parameter=value,...](x,y,w,h,mr)
+%
+% Required arguments in \unitlengh:
+% x,y : coordinates of the oval center.
+% w,h : width and height of the oval.
+% rm : defines the maximal radius for the corners.
+% Optional argument:
+% [parameter=value,...]
+\def\drawoval#1(#2){{%
+ \@ifnextchar[{\process@ovalopt}{\draw@oval}#1(#2)}}
+\def\process@ovalopt[#1]{\gas@set#1,&\draw@oval}%
+\def\draw@oval(#1,#2,#3,#4,#5){{%
+ \dim@x=#1\unitlength \edef\ps@path{\strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=#3\unitlength \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=#4\unitlength \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \dim@x=#5\unitlength \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \edef\ps@path{\ps@path !psovalpath\space}%
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color \ps@path fill
+ \fi
+ \if@frame
+ \line@color \ps@path stroke
+ \fi
+ }}
+}}
+
+%-----------------------------------------------------------------------
+% Draw a polygon defined by n points (n>1).
+% The polygon may be framed and/or filled depending on the current parameters.
+%
+% \drawpolygon(x1,y1)...(xn,yn)
+% \drawpolygon[parameter=value,...](x1,y1)...(xn,yn)
+%
+% Required arguments in \unitlengh:
+% (x1,y1)...(xn,yn) : coordinates of the points.
+% Optional argument:
+% [parameter=value,...]
+\def\drawpolygon#1(#2){\begingroup%
+ \setcounter{cnt@a}{0} \edef\ps@param{}%
+ \@ifnextchar[{\process@polygonopt}{\draw@polygon}#1(#2)}
+\def\process@polygonopt[#1]{\gas@set#1,&\draw@polygon}%
+\def\draw@polygon(#1,#2){%
+ \setcounter{cnt@a}{\thecnt@a+1}
+ \dim@x=#1\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \@ifnextchar({\draw@polygon}{
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color
+ \ps@param \thecnt@a\space \arc@radius !pspolygonpath fill
+ \fi
+ \if@frame
+ \line@color
+ \ps@param \thecnt@a\space \arc@radius !pspolygonpath stroke
+ \fi
+ }}
+ \endgroup
+ }}
+
+%-----------------------------------------------------------------------
+% Draw a regular polygon
+% The polygon may be framed and/or filled depending on the current parameters.
+%
+% \drawrpolygon(x,y)(n,r)
+% \drawrpolygon[parameter=value,...](x,y)(n,r)
+%
+% Required arguments:
+% x,y : coordinates in \unitlengh of the center of the polygon.
+% n : number of sides of the polygon.
+% r : radius in \unitlengh of the polygon.
+% Optional argument: (in particular, polyangle and arcradius)
+% [parameter=value,...]
+\def\drawrpolygon#1(#2)(#3){\begingroup%
+ \@ifnextchar[{\process@rpolygonopt}{\draw@rpolygon}#1(#2)(#3)}
+\def\process@rpolygonopt[#1]{\gas@set#1,&\draw@rpolygon}%
+\def\draw@rpolygon(#1,#2)(#3,#4){%
+ \dim@x=#1\unitlength \dim@y=#2\unitlength
+ \edef\ps@path{\strip@PT\dim@x \strip@PT\dim@y #3\space}%
+ \dim@x=#4\unitlength \edef\ps@path{\ps@path \strip@PT\dim@x}%
+ \edef\ps@path{\ps@path \poly@angle\space \arc@radius 0 !psrpolygonpath\space}%
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color \ps@path fill
+ \fi
+ \if@frame
+ \line@color \ps@path stroke
+ \fi
+ }}
+ \endgroup}
+
+%-----------------------------------------------------------------------
+% Draw closed curve defined by n points (n>1).
+% Between each pair of consecutive points, we use a cubic Bezier curve.
+% The control points of the cubic Bezier curves are determined so that
+% the whole curve is C^1 and the tangent at each point is orthogonal to
+% the bisector at this point.
+% The closed curve may be framed and/or filled depending on
+% the current parameters.
+%
+% \drawccurve(x1,y1)...(xn,yn)
+% \drawccurve[parameter=value,...](x1,y1)...(xn,yn)
+%
+% Required arguments in \unitlengh:
+% (x1,y1)...(xn,yn) : coordinates of the points.
+% Optional argument:
+% [parameter=value,...]
+\def\drawccurve#1(#2){\begingroup%
+ \setcounter{cnt@a}{0} \edef\ps@param{}%
+ \@ifnextchar[{\process@drawccurveopt}{\draw@c@curve}#1(#2)}
+\def\process@drawccurveopt[#1]{\gas@set#1,&\draw@c@curve}%
+\def\draw@c@curve(#1,#2){%
+ \setcounter{cnt@a}{\thecnt@a+1}
+ \dim@x=#1\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \@ifnextchar({\draw@c@curve}{
+ \put(0,0){\special{" \gas@initps
+ \if@fill
+ \fill@color
+ \ps@param \thecnt@a\space !psccurvepath fill
+ \fi
+ \if@frame
+ \line@color
+ \ps@param \thecnt@a\space !psccurvepath stroke
+ \fi
+ }}
+ \endgroup
+}}
+
+%-----------------------------------------------------------------------
+% Draw curve defined by n points (n>1).
+% Between each pair of consecutive points, we use a cubic Bezier curve.
+% The control points of the cubic Bezier curves are determined so that
+% the whole curve is C^1 and the tangent at each point is orthogonal to
+% the bisector at this point.
+%
+% \drawcurve(x1,y1)...(xn,yn)
+% \drawcurve[parameter=value,...](x1,y1)...(xn,yn)
+%
+% Required arguments in \unitlengh:
+% (x1,y1)...(xn,yn) : coordinates of the points.
+% Optional argument:
+% [parameter=value,...]
+\def\drawcurve#1(#2){\begingroup%
+ \setcounter{cnt@a}{0} \edef\ps@param{}%
+ \@ifnextchar[{\process@drawcurveopt}{\draw@curve}#1(#2)}
+\def\process@drawcurveopt[#1]{\gas@set#1,&\draw@curve}%
+\def\draw@curve(#1,#2){%
+ \setcounter{cnt@a}{\thecnt@a+1}
+ \dim@x=#1\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@param{\ps@param \strip@PT\dim@x}%
+ \@ifnextchar({\draw@curve}{
+ \put(0,0){\special{" \gas@initps \line@color
+ \gas@ATparam \gas@AHparam
+ \ps@param \thecnt@a\space !pscurve}}
+ \endgroup
+}}
+
+%-----------------------------------------------------------------------
+% Draw a quadratic Bezier curve.
+% The line may have arrowhead(s), ... depending of the current settings
+%
+% \drawqbezier(x0,y0,x1,y1,x2,y2)
+% \drawqbezier[parameter=value,...](x0,y0,x1,y1,x2,y2)
+%
+% \drawqbezier arguments:
+% x0,y0,x1,y1,x2,y2 : coordinates in \unitlength of the control points
+% Optional argument:
+% [parameter=value,...]
+\def\drawqbezier#1(#2){{%
+ \@ifnextchar[{\process@drawqbezieropt}{\draw@q@bezier}#1(#2)}}
+\def\process@drawqbezieropt[#1]{\gas@set#1,&\draw@q@bezier}%
+\def\draw@q@bezier(#1,#2,#3,#4,#5,#6){{%
+ \dim@x=#1\unitlength \edef\ps@xa{\strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@ya{\strip@PT\dim@x}%
+ \dim@x=#3\unitlength \edef\ps@xb{\strip@PT\dim@x}%
+ \dim@x=#4\unitlength \edef\ps@yb{\strip@PT\dim@x}%
+ \dim@x=#5\unitlength \edef\ps@xc{\strip@PT\dim@x}%
+ \dim@x=#6\unitlength \edef\ps@yc{\strip@PT\dim@x}%
+ \put(0,0){\special{" \gas@initps \line@color
+ \gas@ATparam \gas@AHparam
+ \ps@xa \ps@ya \ps@xb \ps@yb \ps@xc \ps@yc !ps_qbezier}}
+}}
+
+%-----------------------------------------------------------------------
+% Draw a cubic Bezier curve.
+% The line may have arrowhead(s), ... depending of the current settings
+%
+% \drawcbezier(x0,y0,x1,y1,x2,y2,x3,y3)
+% \drawcbezier[parameter=value,...](x0,y0,x1,y1,x2,y2,x3,y3)
+%
+% \drawcbezier arguments:
+% x0,y0,x1,y1,x2,y2,x3,y3 : coordinates in \unitlength of the control points
+% Optional argument:
+% [parameter=value,...]
+\def\drawcbezier#1(#2){{%
+ \@ifnextchar[{\process@drawcbezieropt}{\draw@c@bezier}#1(#2)}}
+\def\process@drawcbezieropt[#1]{\gas@set#1,&\draw@c@bezier}%
+\def\draw@c@bezier(#1,#2,#3,#4,#5,#6,#7,#8){{%
+ \dim@x=#1\unitlength \edef\ps@xa{\strip@PT\dim@x}%
+ \dim@x=#2\unitlength \edef\ps@ya{\strip@PT\dim@x}%
+ \dim@x=#3\unitlength \edef\ps@xb{\strip@PT\dim@x}%
+ \dim@x=#4\unitlength \edef\ps@yb{\strip@PT\dim@x}%
+ \dim@x=#5\unitlength \edef\ps@xc{\strip@PT\dim@x}%
+ \dim@x=#6\unitlength \edef\ps@yc{\strip@PT\dim@x}%
+ \dim@x=#7\unitlength \edef\ps@xd{\strip@PT\dim@x}%
+ \dim@x=#8\unitlength \edef\ps@yd{\strip@PT\dim@x}%
+ \put(0,0){\special{" \gas@initps \line@color
+ \gas@ATparam \gas@AHparam
+ \ps@xa \ps@ya \ps@xb \ps@yb \ps@xc \ps@yc \ps@xd \ps@yd !ps_cbezier}}
+}}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Internal macros
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%-----------------------------------------------------------------------
+% Compute the diameter of a node in some direction
+%
+% \node@diam(Node,angle)
+%
+% Result in \cs@nd.
+% Byproduct: \cs@cos=cos(angle), \cs@sin=sin(angle) are also defined.
+%
+% There are 3 cases depending on whether the direction intersects the node
+% on a vertical line, an horizontal line or a rounded corner.
+\def\node@diam(#1,#2){%
+ \CalculateCos{#2} \edef\cs@cos{\UseCos{#2}}%
+ \CalculateSin{#2} \edef\cs@sin{\UseSin{#2}}%
+ \ifnum\csname node@#1@w\endcsname=-1 % then it's a polygonal node
+ \edef\cs@rad{\csname node@#1@rad\endcsname}%
+ \edef\cs@n{\csname node@#1@n\endcsname}%
+ \edef\cs@a{\csname node@#1@a\endcsname}%
+ \setcounter{cnt@b}{360/\cs@n}\edef\cs@b{\thecnt@b}%
+ \setcounter{cnt@a}{#2-\cs@a}
+ \@whilenum\thecnt@a>\thecnt@b\do{\setcounter{cnt@a}{\thecnt@a-\thecnt@b}}
+ \@whilenum\thecnt@a<0\do{\setcounter{cnt@a}{\thecnt@a+\thecnt@b}}
+ \setcounter{cnt@b}{\thecnt@b/2}
+ \setcounter{cnt@a}{\thecnt@a-\thecnt@b}
+ \ifnum\thecnt@a<0 \setcounter{cnt@a}{-\thecnt@a} \fi
+ \CalculateCos{\thecnt@a} \CalculateCos{\thecnt@b}%
+ \setcounter{cnt@c}{2*\cs@rad*\real{\UseCos{\thecnt@b}}/\real{\UseCos{\thecnt@a}}}
+ \edef\cs@nd{\thecnt@c}%
+ \else % it's an oval node
+ \edef\cs@w{\csname node@#1@w\endcsname}%
+ \edef\cs@h{\csname node@#1@h\endcsname}%
+ \edef\cs@r{\csname node@#1@r\endcsname}%
+ \setcounter{cnt@a}{\cs@r+\cs@r}\edef\cs@rr{\thecnt@a}%
+ \setcounter{cnt@a}{(\cs@h-\cs@rr)*\real{\cs@cos}}
+ \ifnum\thecnt@a<0\edef\cs@A{-\thecnt@a}\else\edef\cs@A{\thecnt@a}\fi%
+ \setcounter{cnt@a}{(\cs@w-\cs@rr)*\real{\cs@sin}}
+ \ifnum\thecnt@a<0\edef\cs@B{-\thecnt@a}\else\edef\cs@B{\thecnt@a}\fi%
+ \setcounter{cnt@a}{\cs@w*\real{\cs@sin}}
+ \ifnum\thecnt@a<0\setcounter{cnt@a}{-\thecnt@a}\fi
+ \ifnum\thecnt@a<\cs@A
+ \setcounter{cnt@c}{\cs@w/\real{\cs@cos}}
+ \ifnum\thecnt@c<0\edef\cs@nd{-\thecnt@c}\else\edef\cs@nd{\thecnt@c}\fi%
+ \else
+ \setcounter{cnt@a}{\cs@h*\real{\cs@cos}}
+ \ifnum\thecnt@a<0\setcounter{cnt@a}{-\thecnt@a}\fi
+ \ifnum\thecnt@a<\cs@B
+ \setcounter{cnt@c}{\cs@h/\real{\cs@sin}}
+ \ifnum\thecnt@c<0\edef\cs@nd{-\thecnt@c}\else\edef\cs@nd{\thecnt@c}\fi%
+ \else
+ \setcounter{cnt@a}{\cs@rr*\cs@rr-(\cs@B-\cs@A)*(\cs@B-\cs@A)}
+ \gas@sqrt{\thecnt@a}
+ \setcounter{cnt@a}{(\cs@w-\cs@rr)*\real{\cs@cos}}
+ \ifnum\thecnt@a<0\edef\cs@E{-\thecnt@a}\else\edef\cs@E{\thecnt@a}\fi%
+ \setcounter{cnt@a}{(\cs@h-\cs@rr)*\real{\cs@sin}}
+ \ifnum\thecnt@a<0\edef\cs@F{-\thecnt@a}\else\edef\cs@F{\thecnt@a}\fi%
+ \setcounter{cnt@a}{\the@sqrt+\cs@E+\cs@F}\edef\cs@nd{\thecnt@a}%
+ \fi
+ \fi
+ \fi
+% \typeout{w=\cs@w,h=\cs@h,r=\cs@r,angle=#2,\cs@nd}
+}
+
+%-----------------------------------------------------------------------
+% Draw the cubic Bezier curve.
+% The control points
+% (\cs@xa,\cs@ya)(\cs@xb,\cs@yb)(\cs@xc,\cs@yc)(\cs@xd,\cs@yd)
+% should already be defined.
+%
+% #1 : name of the starting node
+% #2 : name of the ending node
+% #3 : label of the edge
+\def\draw@b@edge(#1,#2)#3{{%
+% Parameters for the Bezier curve.
+ \dim@x=\cs@xa\unitlength \edef\ps@xa{\strip@PT\dim@x}%
+ \dim@x=\cs@ya\unitlength \edef\ps@ya{\strip@PT\dim@x}%
+ \dim@x=\cs@xb\unitlength \edef\ps@xb{\strip@PT\dim@x}%
+ \dim@x=\cs@yb\unitlength \edef\ps@yb{\strip@PT\dim@x}%
+ \dim@x=\cs@xc\unitlength \edef\ps@xc{\strip@PT\dim@x}%
+ \dim@x=\cs@yc\unitlength \edef\ps@yc{\strip@PT\dim@x}%
+ \dim@x=\cs@xd\unitlength \edef\ps@xd{\strip@PT\dim@x}%
+ \dim@x=\cs@yd\unitlength \edef\ps@yd{\strip@PT\dim@x}%
+ \put(0,0){\special{" \gas@initps \line@color
+% Path around starting node
+ \csname node@#1@path\endcsname /path!a false upath cvlit def
+% Path around ending node
+ \csname node@#2@path\endcsname /path!b false upath cvlit def
+% The curve
+ \gas@ATparam \gas@AHparam
+ \ps@xa \ps@ya \ps@xb \ps@yb \ps@xc \ps@yc \ps@xd \ps@yd !ps_r_cbezier
+ }}
+% Coordinates (\cs@x,\cs@y) and slope (\cs@deltax,\cs@deltay) at the
+% point of the curve defined by the parameter label@pos.
+ \def\@N{100}%
+% coefficients of the polynomial x(t)
+ \setcounter{cnt@a}{\cs@xd-\cs@xa+3*(\cs@xb-\cs@xc)}\edef\@A{\thecnt@a}%
+ \setcounter{cnt@a}{3*(\cs@xa+\cs@xc-2*\cs@xb)}\edef\@B{\thecnt@a}%
+ \setcounter{cnt@a}{3*(\cs@xb-\cs@xa)}\edef\@C{\thecnt@a}%
+% computation of \cs@x and \cs@deltax
+ \setcounter{cnt@a}{((\@A*\EL@p/\@N+\@B)*\EL@p/\@N+\@C)*\EL@p/\@N+\cs@xa}
+ \edef\cs@x{\thecnt@a}%
+ \setcounter{cnt@a}{(3*\@A*\EL@p/\@N+2*\@B)*\EL@p/\@N+\@C}
+ \edef\cs@deltax{\thecnt@a}%
+% coefficients of the polynomial y(t)
+ \setcounter{cnt@a}{\cs@yd-\cs@ya+3*(\cs@yb-\cs@yc)}\edef\@A{\thecnt@a}%
+ \setcounter{cnt@a}{3*(\cs@ya+\cs@yc-2*\cs@yb)}\edef\@B{\thecnt@a}%
+ \setcounter{cnt@a}{3*(\cs@yb-\cs@ya)}\edef\@C{\thecnt@a}%
+% computation of \cs@y and \cs@deltay
+ \setcounter{cnt@a}{((\@A*\EL@p/\@N+\@B)*\EL@p/\@N+\@C)*\EL@p/\@N+\cs@ya}
+ \edef\cs@y{\thecnt@a}%
+ \setcounter{cnt@a}{(3*\@A*\EL@p/\@N+2*\@B)*\EL@p/\@N+\@C}
+ \edef\cs@deltay{\thecnt@a}%
+% Computation of sqrt(\cs@deltax^2+\cs@deltay^2).
+ \setcounter{cnt@c}{\cs@deltax*\cs@deltax+\cs@deltay*\cs@deltay}
+ \gas@sqrt{\thecnt@c}
+ \ifnum\the@sqrt=0\def\the@sqrt{1}\fi
+% Label of the edge.
+% Computation of the shift from C to the center of the label.
+ \if@ELdistC
+ \setcounter{cnt@c}{\EL@dist}
+ \else
+ \setbox\temp@box\hbox{\selectfont #3}
+ \setcounter{cnt@a}{\wd\temp@box / \d@my@unit * \cs@deltay}
+ \ifnum\thecnt@a<0 \setcounter{cnt@a}{-\thecnt@a} \fi
+ \setcounter{cnt@c}{(\ht\temp@box+\dp\temp@box) / \d@my@unit * \cs@deltax}
+ \ifnum\thecnt@c<0 \setcounter{cnt@c}{-\thecnt@c} \fi
+ \setcounter{cnt@c}{(\thecnt@c+\thecnt@a) / \the@sqrt / 2 + \EL@dist}
+ \fi
+ \if r\EL@s
+ \setcounter{cnt@a}{\cs@x + \cs@deltay * \thecnt@c / \the@sqrt}
+ \setcounter{cnt@b}{\cs@y - \cs@deltax * \thecnt@c / \the@sqrt}
+ \else
+ \setcounter{cnt@a}{\cs@x - \cs@deltay * \thecnt@c / \the@sqrt}
+ \setcounter{cnt@b}{\cs@y + \cs@deltax * \thecnt@c / \the@sqrt}
+ \fi
+% Shifting point C and drawing the label.
+ \put(\thecnt@a,\thecnt@b){\makebox(0,0){\selectfont #3}}
+}}
+
+%-----------------------------------------------------------------------
+% Compute the lower interger part of the square root of
+% (the absolute value of) its argument.
+% The result is obtained with \the@sqrt.
+% We use Heron's method which converges quickly.
+\newcounter{cnt@@a}\newcounter{cnt@@b}\newcounter{cnt@@c}
+\def\gas@sqrt#1{%
+ \ifnum#1<0\setcounter{cnt@@a}{-#1}\else\setcounter{cnt@@a}{#1}\fi
+ \ifnum\thecnt@@a>1
+ \setcounter{cnt@@b}{\thecnt@@a}
+ \setcounter{cnt@@c}{(\thecnt@@a+1)/2}
+ \@whilenum\thecnt@@b>\thecnt@@c\do{
+ \setcounter{cnt@@b}{\thecnt@@c}
+ \setcounter{cnt@@c}{(\thecnt@@b+\thecnt@@a/\thecnt@@b)/2}}
+ \edef\the@sqrt{\thecnt@@b}
+ \else
+ \edef\the@sqrt{\thecnt@@a}
+ \fi
+}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Compatibility with gastex v1.0
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% Should be called inside the scope of a group
+%
+% {\compatiblegastexun ... }
+%
+% The macros \drawloop and \drawedge are redefined to match the old
+% ones (v1.0) hence the new ones (v2.0) cannot be used inside the scope
+% of \compatiblegastexun.
+%
+% The compatibility is almost 100%:
+% - the following are ignored
+% \setmaxbezier
+% The optional argument of letstate defining the repeated state diameter
+% - \settransdecal, \setedgedecal give curved edges
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\def\compatiblegastexun{
+%-----------------------------------------------------------------------
+% Definitions
+%-----------------------------------------------------------------------
+ \unitlength=4pt
+ \d@my@unit= 2048sp % =1/32 pt ~= 0.011 mm
+ \gasset{AHnb=1,AHangle=20}
+ \def\AH@L{\strip@PT\@wholewidth 9 mul }
+ \def\AH@l{\strip@PT\@wholewidth 9 mul 20 cos mul }
+ \def\line@width{\strip@PT\@wholewidth}
+%
+ \def\setstatediam##1{\gasset@Nw{##1}\gasset@Nh{##1}\gasset@Nmr{##1}}
+ \def\setvertexdiam{\setstatediam}
+ \setstatediam{6}
+%
+ \def\setrepeatedstatediam##1{%
+ \setcounter{cnt@a}{1*\ratio{##1\unitlength}{\d@my@unit}}
+ \edef\repeated@diam{\thecnt@a}}%
+ \setrepeatedstatediam{5}
+%
+ \def\setloopdiam{\gasset@loopdiam}%
+ \setloopdiam{6}
+%
+ \def\settranslabelskip{\gasset@ELdist}%
+ \def\setedgelabelskip{\gasset@ELdist}
+ \settranslabelskip{1}
+%
+ \def\setprofcurve##1{%
+ \setcounter{cnt@a}{1*\ratio{##1\unitlength}{\d@my@unit}}
+ \edef\prof@curve{\thecnt@a}}%
+ \setprofcurve{3}
+%
+ \def\settransdecal##1{%
+ \setcounter{cnt@a}{1*\ratio{##1\unitlength}{\d@my@unit}}
+ \edef\trans@decal{\thecnt@a}}%
+ \settransdecal{0}
+ \def\setedgedecal{\settransdecal}
+%
+ \def\setmaxbezier##1{}
+ \def\setnbptbezier##1{} % compatibilite version 0.3
+ \def\setprecision##1{} % compatibilite version 0.3
+%
+ \def\setpsdash{\@ifnextchar[{\i@setpsdash}{\i@setpsdash[0]}}
+ \def\i@setpsdash[##1](##2){%
+ \dim@y=\unitlength \unitlength=1pt
+ \gasset@@dash{0 ##2}{##1}
+ \unitlength=\dim@y
+ \def\ps@dash{[##2] ##1\space}}%
+ \setpsdash() % continuous path
+%
+ \def\pcolor{}
+ \def\pictcolor##1##2{}
+%
+ \def\setpsgray##1{\gasset@linegray{##1}\gasset@fillgray{##1}}%
+ \setpsgray{0} % black
+%-----------------------------------------------------------------------
+% States
+%-----------------------------------------------------------------------
+ \def\letstate{\@ifnextchar[{\i@letstate}{\ii@letstate}}%
+ \def\i@letstate[##1,##2] ##3=(##4,##5){{%
+ \gasset{Nw=##1,Nh=##1,Nmr=##1}
+ \let@node(##3)(##4,##5){}}}
+ \def\ii@letstate ##1=(##2,##3){%
+ \let@node(##1)(##2,##3){}}
+ \def\letvertex{\@ifnextchar[{\i@letvertex}{\ii@letstate}}%
+ \def\i@letvertex[##1] ##2=(##3,##4){{%
+ \gasset{Nw=##1,Nh=##1,Nmr=##1}
+ \let@node(##2)(##3,##4){}}}
+%
+ \def\drawstate(##1)##2{{\gasset{Nfill=n}\draw@node(##1){##2}}}%
+ \def\drawvertex(##1)##2{{\gasset{Nfill=n,Nframe=n}\draw@node(##1){##2}}}%
+ \def\drawcircledvertex{\drawstate}%
+%
+ \def\drawinitialstate{%
+ \@ifnextchar[{\@idrawinitialstate}{\@idrawinitialstate[l]}}
+ \def\@idrawinitialstate[##1](##2)##3{{%
+ \gasset{Nfill=n}\draw@node(##2){##3}
+ \setcounter{cnt@a}{\N@w*\ratio{\d@my@unit}{\unitlength}/2}
+ \if##1l \imark[iangle=180,ilength=\thecnt@a](##2) \fi
+ \if##1r \imark[iangle= 0,ilength=\thecnt@a](##2) \fi
+ \if##1t \imark[iangle= 90,ilength=\thecnt@a](##2) \fi
+ \if##1b \imark[iangle=-90,ilength=\thecnt@a](##2) \fi}}
+%
+ \def\drawfinalstate{%
+ \@ifnextchar[{\@idrawfinalstate}{\@idrawfinalstate[r]}}
+ \def\@idrawfinalstate[##1](##2)##3{{%
+ \gasset{Nfill=n}\draw@node(##2){##3}
+ \setcounter{cnt@a}{\N@w*\ratio{\d@my@unit}{\unitlength}/2}
+ \if##1l \fmark[fangle=180,flength=\thecnt@a](##2) \fi
+ \if##1r \fmark[fangle= 0,flength=\thecnt@a](##2) \fi
+ \if##1t \fmark[fangle= 90,flength=\thecnt@a](##2) \fi
+ \if##1b \fmark[fangle=-90,flength=\thecnt@a](##2) \fi}}
+%
+ \def\drawrepeatedstate(##1)##2{{%
+ \gasset{Nfill=n}\draw@node(##1){##2}
+ \setcounter{cnt@a}{(\N@w-\repeated@diam)/2}
+ \edef\rep@dist{\thecnt@a}%
+ \rmark(##1)}}
+%-----------------------------------------------------------------------
+% Transitions
+%-----------------------------------------------------------------------
+ \let\gas@edge=\drawedge
+ \def\drawtrans{\@ifnextchar[{\@idrawtrans}{\@idrawtrans[l]}}
+ \def\@idrawtrans[##1](##2,##3)##4{%
+ \setcounter{cnt@a}{\trans@decal*\ratio{\d@my@unit}{\unitlength}}
+ \if##1r \gas@edge[ELside=r,curvedepth=\thecnt@a](##2,##3){##4}
+ \else \if##1b \gas@edge[ELside=r,curvedepth=\thecnt@a](##2,##3){##4}
+ \else \gas@edge[ELside=l,curvedepth=\thecnt@a](##2,##3){##4} \fi\fi}
+ \def\drawedge{\drawtrans}
+ \def\drawundirectededge##1(##2,##3)##4{%
+ {\def\AH@nb{0 }\drawtrans##1(##2,##3){##4}}}
+%
+ \def\drawcurvedtrans{%
+ \@ifnextchar[{\@idrawcurvedtrans}{\@idrawcurvedtrans[l]}}
+ \def\@idrawcurvedtrans[##1](##2,##3)##4{%
+ \setcounter{cnt@a}{\prof@curve*\ratio{\d@my@unit}{\unitlength}}
+ \if##1r \gas@edge[ELside=r,curvedepth=\thecnt@a](##2,##3){##4}
+ \else \if##1b \gas@edge[ELside=r,curvedepth=\thecnt@a](##2,##3){##4}
+ \else \gas@edge[ELside=l,curvedepth=\thecnt@a](##2,##3){##4} \fi\fi}
+ \def\drawcurvededge{\drawcurvedtrans}
+ \def\drawundirectedcurvededge##1(##2,##3)##4{%
+ {\def\AH@nb{0 }\drawcurvedtrans##1(##2,##3){##4}}}
+%
+ \def\drawqbeziertrans{%
+ \@ifnextchar[{\@idrawqbeziertrans}{\@idrawqbeziertrans[l]}}
+ \def\@idrawqbeziertrans[##1](##2)(##3,##4)(##5)##6{%
+ \if##1r \drawqbedge[ELside=r](##2,##3,##4,##5){##6}
+ \else \if##1b \drawqbedge[ELside=r](##2,##3,##4,##5){##6}
+ \else \drawqbedge[ELside=l](##2,##3,##4,##5){##6} \fi\fi}
+ \def\drawqbezieredge{\drawqbeziertrans}
+ \def\drawundirectedqbezieredge##1(##2)(##3,##4)(##5)##6{%
+ {\def\AH@nb{0 }\drawqbeziertrans##1(##2)(##3,##4)(##5){##6}}}
+%
+ \def\drawcbeziertrans{%
+ \@ifnextchar[{\@idrawcbeziertrans}{\@idrawcbeziertrans[l]}}
+ \def\@idrawcbeziertrans[##1](##2)(##3,##4)(##5,##6)(##7)##8{{%
+ \if##1r \edef\EL@s{r}
+ \else \if##1b \edef\EL@s{r}
+ \else \edef\EL@s{l} \fi\fi
+ \draw@bcedge(##2,##3,##4,##7,##5,##6){##8}
+ }}
+ \def\drawcbezieredge{\drawcbeziertrans}
+ \def\drawundirectedcbezieredge##1(##2)(##3,##4)(##5,##6)(##7)##8{%
+ {\def\AH@nb{0 }\drawcbeziertrans##1(##2)(##3,##4)(##5,##6)(##7){##8}}}
+%
+ \let\gas@loop=\drawloop
+ \def\drawloop{\@ifnextchar[{\@idrawloop}{\@idrawloop[t]}}%
+ \def\@idrawloop[##1](##2)##3{%
+ \if##1l \gas@loop[loopangle=180](##2){##3} \fi
+ \if##1r \gas@loop[loopangle= 0](##2){##3} \fi
+ \if##1t \gas@loop[loopangle= 90](##2){##3} \fi
+ \if##1b \gas@loop[loopangle=-90](##2){##3} \fi}
+ \def\drawundirectedloop##1(##2)##3{%
+ {\def\AH@nb{0 }\drawloop##1(##2){##3}}}
+}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Compatibility with pspictpg v0.6
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% Should be called inside the scope of a group
+%
+% {\compatiblepspictpg ... }
+%
+% The macros \drawline and \drawcircle are redefined to match those of
+% pspictpg hence thoses of GasTeX cannot be used inside the scope
+% of \compatiblepspictpg.
+%
+% The following macros are ignored. Use linecolor and fillcolor instead.
+% \pcolor, \pictcolor
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\def\compatiblepspictpg{
+%
+ \def\setpsdash{\@ifnextchar[{\i@setpsdash}{\i@setpsdash[0]}}
+ \def\i@setpsdash[##1](##2){%
+ \dim@y=\unitlength \unitlength=1pt
+ \gasset@@dash{0 ##2}{##1}
+ \unitlength=\dim@y
+ \def\ps@dash{[##2] ##1\space}}%
+ \setpsdash() % continuous path
+%
+ \def\pcolor{}
+ \def\pictcolor##1##2{}
+%
+ \def\setpsgray##1{\gasset@linegray{##1}\gasset@fillgray{##1}}%
+ \setpsgray{0} % black
+%
+ % Redefinition of latex \line(a,b){L}.
+ % Can be used with any values for a and b.
+ \def\line(##1,##2)##3{{%
+ \@xarg ##1\relax \@yarg ##2\relax
+ \dim@x=##3\unitlength
+ \special{" \gas@initps \line@color
+ \the\@xarg\space \the\@yarg\space \strip@PT\dim@x !pslatexline}
+ }}
+%
+ % Redefinition of latex \vector(a,b){L}.
+ % Can be used with any values for a and b.
+ \def\vector(##1,##2)##3{{%
+ \@xarg ##1\relax \@yarg ##2\relax
+ \dim@x=##3\unitlength
+ \special{" \gas@initps \line@color \gas@ATnul \gas@AHparam
+ \the\@xarg\space \the\@yarg\space \strip@PT\dim@x !pslatexvector}
+ }}
+%
+ % redefinition of \circle of LaTeX
+ % can be used with any diameter
+ \def\circle{\@ifnextchar*{\@idisk}{\@icircle}}
+ \def\@icircle##1{{%
+ \dim@x=##1\unitlength
+ \special{" \gas@initps \line@color
+ \strip@PT\dim@x !pscircle}
+ }}
+ \def\@idisk*##1{{%
+ \dim@x=##1\unitlength
+ \special{" \gas@initps \fill@color
+ \strip@PT\dim@x !psdisk}
+ }}
+%
+ \def\drawline(##1,##2)(##3,##4){\begingroup%
+ \setcounter{cnt@a}{0} \edef\ps@param{}%
+ \process@drawlineopt[ATnb=0,AHnb=0](##1,##2)(##3,##4)}
+ \def\drawvector(##1,##2)(##3,##4){\begingroup%
+ \setcounter{cnt@a}{0} \edef\ps@param{}%
+ \process@drawlineopt[ATnb=0,AHnb=1](##1,##2)(##3,##4)}
+ \def\drawcircle(##1,##2)(##3){{%
+ \gasset{Nframe=y,Nfill=n}\draw@circle(##1,##2,##3)}}
+ \def\drawdisk(##1,##2)(##3){{%
+ \gasset{Nframe=n,Nfill=y}\draw@circle(##1,##2,##3)}}
+ \def\cbezier(##1,##2)(##3,##4)(##5,##6)(##7,##8){%
+ \drawcbezier[ATnb=0,AHnb=0](##1,##2,##3,##4,##5,##6,##7,##8)}
+ \def\cbeziervector(##1,##2)(##3,##4)(##5,##6)(##7,##8){%
+ \drawcbezier[ATnb=0,AHnb=1](##1,##2,##3,##4,##5,##6,##7,##8)}
+ \def\qbezier(##1,##2)(##3,##4)(##5,##6){%
+ \drawqbezier[ATnb=0,AHnb=0](##1,##2,##3,##4,##5,##6)}
+ \def\qbeziervector(##1,##2)(##3,##4)(##5,##6){%
+ \drawqbezier[ATnb=0,AHnb=1](##1,##2,##3,##4,##5,##6)}
+}
+
+\endinput