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+\ProvidesFileRCS $Header: /cvsroot/pgf/pgf/generic/pgf/systemlayer/pgfsyssoftpath.code.tex,v 1.1.1.1 2005/06/29 12:14:05 tantau Exp $
+
+% Copyright 2005 by Till Tantau <tantau@cs.tu-berlin.de>.
+%
+% This program can be redistributed and/or modified under the terms
+% of the GNU Public License, version 2.
+
+
+
+% This package provides the pgf system path abstraction layer. This
+% layer is used to construct paths first ``abstractly.'' These
+% abstract paths can still be modified, before they are ``made
+% concrete.'' 
+%
+% An abstract path consists of a sequence of basic building blocks,
+% each of which is a tuple consisting of two numbers (specifying a
+% coordinate) and a token. Possible tokens are:
+%
+% 1. moveto
+% 2. lineto
+% 3. rectcorner
+% 4. rectsize
+% 5. curvetosupporta
+% 6. curvetosupportb
+% 7. curveto
+% 8. closepath
+% 9. specialround
+%
+% A curveto must always be preceeded by a curvetosupporta and a
+% curvetosupportb. A non-empty path must always begin with a
+% moveto. The coordinates of a closepath are non-specified, currently, 
+% but they might be set to the coordinate of the path segment start,
+% in the future.
+
+
+
+\let\pgfsyssoftpath@currentpath=\@empty
+% The current path
+
+\def\pgfsyssoftpath@lastmoveto{{0pt}{0pt}}
+
+% Add a moveto element to the current path
+\def\pgfsyssoftpath@moveto#1#2{%
+  \edef\pgfsyssoftpath@temp{{%
+    \noexpand\pgfsyssoftpath@movetotoken{#1}{#2}%
+  }}%
+  \expandafter\g@addto@macro\expandafter\pgfsyssoftpath@currentpath\pgfsyssoftpath@temp%
+  \xdef\pgfsyssoftpath@lastmoveto{{#1}{#2}}%
+}
+
+% Add a lineto element to the current path
+\def\pgfsyssoftpath@lineto#1#2{%
+  \edef\pgfsyssoftpath@temp{{%
+    \noexpand\pgfsyssoftpath@linetotoken{#1}{#2}%
+  }}%
+ \expandafter\g@addto@macro\expandafter\pgfsyssoftpath@currentpath\pgfsyssoftpath@temp%
+}
+
+% Add curveto elements to the current path
+\def\pgfsyssoftpath@curveto#1#2#3#4#5#6{%
+  \edef\pgfsyssoftpath@temp{{%
+    \noexpand\pgfsyssoftpath@curvetosupportatoken{#1}{#2}%
+    \noexpand\pgfsyssoftpath@curvetosupportbtoken{#3}{#4}%
+    \noexpand\pgfsyssoftpath@curvetotoken{#5}{#6}%
+  }}%
+ \expandafter\g@addto@macro\expandafter\pgfsyssoftpath@currentpath\pgfsyssoftpath@temp%
+}
+
+% Add rectanlge elements to the current path
+\def\pgfsyssoftpath@rect#1#2#3#4{%
+  \edef\pgfsyssoftpath@temp{{%
+    \noexpand\pgfsyssoftpath@rectcornertoken{#1}{#2}%
+    \noexpand\pgfsyssoftpath@rectsizetoken{#3}{#4}%
+  }}%
+ \expandafter\g@addto@macro\expandafter\pgfsyssoftpath@currentpath\pgfsyssoftpath@temp%
+}
+
+% Add closepath element to the current path
+\def\pgfsyssoftpath@closepath{%
+  \edef\pgfsyssoftpath@temp{{%
+    \noexpand\pgfsyssoftpath@closepathtoken\pgfsyssoftpath@lastmoveto%
+  }}%
+  \expandafter\g@addto@macro\expandafter\pgfsyssoftpath@currentpath\pgfsyssoftpath@temp%
+}
+
+% Add special element to the current path
+\def\pgfsyssoftpath@specialround#1#2{%
+  \edef\pgfsyssoftpath@temp{{%
+    \noexpand\pgfsyssoftpath@specialroundtoken{#1}{#2}%
+  }}%
+ \expandafter\g@addto@macro\expandafter\pgfsyssoftpath@currentpath\pgfsyssoftpath@temp%
+}
+
+
+% Getting and setting the current path
+\def\pgfsyssoftpath@getcurrentpath#1{%
+  \let#1=\pgfsyssoftpath@currentpath%
+}
+
+\def\pgfsyssoftpath@setcurrentpath#1{%
+  \global\let\pgfsyssoftpath@currentpath=#1%
+}
+
+
+% Invoking the current path
+\def\pgfsyssoftpath@invokecurrentpath{%
+  \pgfsyssoftpath@currentpath%
+}
+
+\def\pgfsyssoftpath@flushcurrentpath{%
+  \pgfsyssoftpath@invokecurrentpath%
+  \pgfsyssoftpath@setcurrentpath\@empty%
+}
+
+% Marshallers
+\def\pgfsyssoftpath@movetotoken#1#2{\pgfsys@moveto{#1}{#2}}
+\def\pgfsyssoftpath@linetotoken#1#2{\pgfsys@lineto{#1}{#2}}
+\def\pgfsyssoftpath@rectcornertoken#1#2#3#4#5{\pgfsys@rect{#1}{#2}{#4}{#5}} % #3 = \pgfsyssoftpath@rectsizetoken
+\def\pgfsyssoftpath@curvetosupportatoken#1#2#3#4#5#6#7#8{\pgfsys@curveto{#1}{#2}{#4}{#5}{#7}{#8}}
+\def\pgfsyssoftpath@closepathtoken#1#2{\pgfsys@closepath}
+\let\pgfsyssoftpath@specialroundtoken=\@gobbletwo
+
+
+\endinput
+
+%%% Local Variables: 
+%%% mode: latex
+%%% End: