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+% pgf/tikz library
+% for signal flow diagrams
+%
+% Author: Dr. Karlheinz Ochs, Ruhr-University of Bochum, Germany
+% Version: 0.1
+% Date: 2007/01/05
+
+%
+% Extended general shape options, cf. tikz.code.tex
+%
+% #1 = source node
+% Remark: The node distance is used
+% for the distance between the borders of two nodes
+\tikzoption{below from}{\tikz@from{#1}{1}{-90}{south}{north}}%
+\tikzoption{right from}{\tikz@from{#1}{1}{0}{east}{west}}%
+\tikzoption{above from}{\tikz@from{#1}{1}{90}{north}{south}}%
+\tikzoption{left from}{\tikz@from{#1}{1}{180}{west}{east}}%
+\tikzoption{below left from}{\tikz@from{#1}{1.414214}{-135}{south west}{north east}}%
+\tikzoption{below right from}{\tikz@from{#1}{1.414214}{-45}{south east}{north west}}%
+\tikzoption{above right from}{\tikz@from{#1}{1.414214}{45}{north east}{south west}}%
+\tikzoption{above left from}{\tikz@from{#1}{1.414214}{135}{north west}{south east}}%
+\def\tikz@from#1#2#3#4#5{%
+ \def\tikz@anchor{#5}%
+ \let\tikz@do@auto@anchor=\relax%
+ \tikz@addtransform{\pgftransformshift{\pgfpointscale{#2}{\pgfpointpolar{#3}{\tikz@node@distance}}}}%
+ \def\tikz@node@at{\pgfpointanchor{#1}{#4}}}
+
+
+%
+% Styles for real and complex signal paths.
+%
+\tikzstyle{dotted path}
+ = [loosely dotted,
+ shorten >= 2mm,
+ shorten <= 2mm]
+\tikzstyle{r}
+ = [line width=\pathlinewidth,
+ >= real tip,
+ draw]
+\tikzstyle{r>}
+ = [r,->]
+\tikzstyle{<r}
+ = [r,<-]
+\tikzstyle{r.}
+ = [r,dotted path]
+\tikzstyle{c}
+ = [line width=\pathlinewidth,
+ double=\pathfillcolor,
+ double distance=\pathlinewidth,
+ >= complex tip,
+ draw,shorten <=-\pathlineextend]
+\tikzstyle{c>}
+ = [c,->]
+\tikzstyle{<c}
+ = [c,<-]
+\tikzstyle{c.}
+ = [c,dotted path]
+
+
+\endinput