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-% A simple library for signal flow diagrams
-% based on the pgf/tikz package of Till Tantau
-%
-% Author: Dr. Karlheinz Ochs, Ruhr-University of Bochum, Germany
-% Version: 0.1
-% Date: 2007/01/05
-\NeedsTeXFormat{LaTeX2e}
-\RequirePackage{tikz}
-\ProvidesPackage{signalflowdiagram}
- [2006/12/30 v0.1 Signal flow diagrams]
-
-%
-% Libraries for signal flow diagrams.
-%
-\usetikzlibrary{signalflowdiagram,signalflowarrows,signalflowoperators,signalflowblocks}
-
-
-%
-% Colors
-%
-\newcommand{\pathdrawcolor}{\blockdrawcolor} % draw color of signal paths
-\newcommand{\pathfillcolor}{\blockfillcolor} % fill color of signal paths
-\newcommand{\operatordrawcolor}{\blockdrawcolor} % draw color of operators
-\newcommand{\operatorfillcolor}{\blockfillcolor} % fill color of operators
-\newcommand{\blockdrawcolor}{black} % draw color of blocks
-\newcommand{\blockfillcolor}{white} % fill color of blocks
-
-%
-% line widths of
-%
-\newcommand{\diagramlinewidth}{0.5mm} % signal flow diagram frames
-\newcommand{\pathlinewidth}{0.3mm} % signal paths
-\newcommand{\operatorlinewidth}{0.3mm} % operator frames
-\newcommand{\blocklinewidth}{0.5mm} % building block styles
-
-%
-% line widths, sizes, etc.
-%
-\newcommand{\nodesize}{1.5mm} % size of nodes
-\newcommand{\terminalsize}{\nodesize} % size of terminals
-\newcommand{\operatorsize}{3mm} % size of circular shaped operator symbols
-\newcommand{\delaysize}{6mm} % minimum size of delay elements
-\newcommand{\blockwidth}{24mm} % minimum width of blocks
-\newcommand{\blockheight}{12mm} % minimum height of blocks
-\newcommand{\blocktextwidth}{22mm} % minimum text width of blocks
-\newcommand{\filterwidth}{12mm} % minimum width of filters
-\newcommand{\filterheight}{8mm} % minimum height of filters
-\newcommand{\filtertextwidth}{6mm} % minimum text width of filters
-
-%
-% misc.
-%
-\newcommand{\pathlineextend}{0.025mm} % shortens the end of the signal paths
-\newcommand{\vbullets}[1]{% vertical bullets
-\node[rectangle,anchor=center,at=(#1),text width=2ex]{%
-$\bullet$\\[-1ex] $\bullet$\\[-1ex] $\bullet$}
-}%
-
-
-%
-% Signal flow diagram.
-%
-% #1 = optional parameter(s)
-% #2 = title text
-\tikzstyle{signal flow diagram} =
- [rectangle,
- sharp corners,
- line width=\diagramlinewidth,
- draw=black,
- inner sep=3mm]
-\newenvironment{signalflow}[2][]{%
-\begin{center}
- \begin{tikzpicture}
- \node[% title
- signal flow diagram,
- fill=blue!90!black,
- text=white] (title) {#2};% title text
- \node at (title.south west) [%
- signal flow diagram,
- fill=blue!20!white,
- anchor=north west,
- yshift=\pgflinewidth]
- \bgroup
- \begin{minipage}{0.9\textwidth}
- \centering
- \begin{tikzpicture}[%
- node distance=8mm,
- pin distance=8mm,
- label distance=-0.5mm,
- inner sep=1mm,
- anchor=center,
- text centered,
- #1]% optional parameter(s)
-}{%
- \end{tikzpicture}
- \end{minipage}
- \egroup;
- \end{tikzpicture}
-\end{center}
-}%
-
-
-%
-% Positioning of node text.
-%
-% #1 = node label
-% #2 = label text
-\newcommand{\textaboveof}[2]{\pgftext[bottom,at=\pgfpointanchor{#1}{north},y=+1mm]{#2}}%
-\newcommand{\textrightof}[2]{\pgftext[left, at=\pgfpointanchor{#1}{east}, x=+1mm]{#2}}%
-\newcommand{\textbelowof}[2]{\pgftext[top ,at=\pgfpointanchor{#1}{south},y=-1mm]{#2}}%
-\newcommand{\textleftof} [2]{\pgftext[right, at=\pgfpointanchor{#1}{west}, x=-1mm]{#2}}%
-
-\makeatletter
-\newcounter{r}
-\newcommand{\tikzgrid}{%
- \pgfsetxvec{\pgfpoint{\tikz@node@distance}{0mm}}%
- \pgfsetyvec{\pgfpoint{0mm}{\tikz@node@distance}}%
- \tikz@matrix%
-}
-\newcommand{\tikz@matrix}[1]{\tikz@@matrix#1@}%
-\def\tikz@@matrix#1@{\do@rows#1\\@\\}%
-\def\do@rows#1\\{%
- \ifx#1@%
- \else%
- \setcounter{r}{0}%
- \do@columns#1&@&%
- \pgftransformshift{\pgfpointxy{-\ther}{-1}}%
- \expandafter\do@rows%
- \fi}%
-\def\do@columns#1&{%
- \if#1@%
- \else%
- \stepcounter{r}%
- \pgftransformshift{\pgfpointxy{1}{0}}%
- #1;%
- \expandafter\do@columns%
- \fi}%
-\makeatother