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tikzlibrarydsp.code.tex
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tikzlibrarydsp.code.tex
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% -------------------------------------------------------------------------
% This library for block diagrams and signal flow graphs was inspired by
% the library "signalflow" of Dr. Karlheinz Ochs, Ruhr-University of Bochum,
% Germany. Furthermore, some ideas were taken from the library "circuitikz"
% of Massimo A. Redaelli and from the PGF library itself.
%
% Copyright 2012 by Matthias Hotz
%
% This work is licensed under the Creative Commons Attribution 2.5 Generic
% License. To view a copy of this license, visit
% http://creativecommons.org/licenses/by/2.5/
% or send a letter to Creative Commons, 444 Castro Street, Suite 900,
% Mountain View, California, 94041, USA.
% -------------------------------------------------------------------------
\usetikzlibrary{arrows, calc, positioning, decorations.markings}
% -------------------------------------------------------------------------
% Parameters for the library
\newcommand{\dsplinewidth}{0.25mm} % Line width for connections
\newcommand{\dspblocklinewidth}{0.3mm} % Line width for blocks
\newcommand{\dspoperatordiameter}{4mm} % Diameter for adder, multiplier, mixer
\newcommand{\dspoperatorlabelspacing}{2mm} % Distance from symbol to label for adder, multiplier, mixer
\newcommand{\dspnoderadius}{1mm} % Filled and empty node
\newcommand{\dspsquareblocksize}{8mm} % Size for square blocks, e.g. for delay elements, decimator, expander
\newcommand{\dspfilterwidth}{14mm} % Width of a filter block
% -------------------------------------------------------------------------
% Define new arrow heads
\pgfarrowsdeclare{dsparrow}{dsparrow}
{
\arrowsize=0.25pt
\advance\arrowsize by .5\pgflinewidth
\pgfarrowsleftextend{-4\arrowsize}
\pgfarrowsrightextend{4\arrowsize}
}
{
\arrowsize=0.25pt
\advance\arrowsize by .5\pgflinewidth
\pgfsetdash{}{0pt} % Solid line (do not dash)
\pgfsetmiterjoin % Fixed miter join of line
\pgfsetbuttcap % Fixed butt cap of line
\pgfpathmoveto{\pgfpoint{-4\arrowsize}{2.5\arrowsize}}
\pgfpathlineto{\pgfpoint{4\arrowsize}{0pt}}
\pgfpathlineto{\pgfpoint{-4\arrowsize}{-2.5\arrowsize}}
\pgfpathclose
\pgfusepathqfill
}
\pgfarrowsdeclare{dsparrowmid}{dsparrowmid}
{
\arrowsize=0.25pt
\advance\arrowsize by .5\pgflinewidth
\pgfarrowsleftextend{-4\arrowsize}
\pgfarrowsrightextend{4\arrowsize}
}
{
\arrowsize=0.25pt
\advance\arrowsize by .5\pgflinewidth
\pgfsetdash{}{0pt}
\pgfsetmiterjoin
\pgfsetbuttcap
\pgfpathmoveto{\pgfpoint{0}{2.5\arrowsize}}
\pgfpathlineto{\pgfpoint{8\arrowsize}{0pt}}
\pgfpathlineto{\pgfpoint{0}{-2.5\arrowsize}}
\pgfpathclose
\pgfusepathqfill
}
% -------------------------------------------------------------------------
% Define new node shapes
\makeatletter
\pgfkeys{/tikz/dsp/label/.initial=above}
% Generic shape generator for operators, i.e. nodes with a circular
% shape with an additional customizable drawing and a text label
\long\def\dspdeclareoperator#1#2{
\pgfdeclareshape{#1}
{
% Saved anchors, macros and dimensions
\savedanchor\centerpoint{\pgfpointorigin}
\savedmacro\label{\def\label{\pgfkeysvalueof{/tikz/dsp/label}}}
\saveddimen\radius
{
\pgfmathsetlength\pgf@xa{\pgfshapeminwidth}
\pgfmathsetlength\pgf@ya{\pgfshapeminheight}
\ifdim\pgf@xa>\pgf@ya
\pgf@x=.5\pgf@xa
\else
\pgf@x=.5\pgf@ya
\fi
}
% Inherit all anchors from the 'circle'-shape:
\inheritanchor[from={circle}]{center}
\inheritanchor[from={circle}]{mid}
\inheritanchor[from={circle}]{base}
\inheritanchor[from={circle}]{north}
\inheritanchor[from={circle}]{south}
\inheritanchor[from={circle}]{west}
\inheritanchor[from={circle}]{east}
\inheritanchor[from={circle}]{mid west}
\inheritanchor[from={circle}]{mid east}
\inheritanchor[from={circle}]{base west}
\inheritanchor[from={circle}]{base east}
\inheritanchor[from={circle}]{north west}
\inheritanchor[from={circle}]{south west}
\inheritanchor[from={circle}]{north east}
\inheritanchor[from={circle}]{south east}
\inheritanchorborder[from={circle}]
% Draw circle and embed additional code
\backgroundpath
{
% Draw circle
\pgfpathcircle{\centerpoint}{\radius}
% Embed additional code
% (Note that this code must call e.g. \pgfusepathqstroke
#2
}
% Define anchor parametrized by the PGF key /tikz/dsp/label
\anchor{text}
{
\centerpoint
%
\def\templabelabove{above}
\def\templabelbelow{below}
\def\templabelleft{left}
\def\templabelright{right}
\pgfutil@tempdima=\dspoperatorlabelspacing
%
\ifx\label\templabelabove
\advance\pgf@x by -0.5\wd\pgfnodeparttextbox
\advance\pgf@y by \radius
\advance\pgf@y by \pgfutil@tempdima
\fi
%
\ifx\label\templabelbelow
\advance\pgf@x by -0.5\wd\pgfnodeparttextbox
\advance\pgf@y by -\radius
\advance\pgf@y by -\pgfutil@tempdima
\advance\pgf@y by -\ht\pgfnodeparttextbox
\fi
%
\ifx\label\templabelleft
\advance\pgf@x by -\radius
\advance\pgf@x by -\pgfutil@tempdima
\advance\pgf@x by -\wd\pgfnodeparttextbox
\advance\pgf@y by -0.5\ht\pgfnodeparttextbox
\advance\pgf@y by +0.5\dp\pgfnodeparttextbox
\fi
%
\ifx\label\templabelright
\advance\pgf@x by \radius
\advance\pgf@x by \pgfutil@tempdima
\advance\pgf@y by -0.5\ht\pgfnodeparttextbox
\advance\pgf@y by +0.5\dp\pgfnodeparttextbox
\fi
}
}
}
\dspdeclareoperator{dspshapecircle}{\pgfusepathqstroke}
\dspdeclareoperator{dspshapecirclefull}{\pgfusepathqfillstroke}
\dspdeclareoperator{dspshapeadder}{
% Coordinate offset for the plus
\pgfutil@tempdima=\radius
\pgfutil@tempdima=0.55\pgfutil@tempdima
% Draw plus
\pgfmoveto{\pgfpointadd{\centerpoint}{\pgfpoint{0pt}{-\pgfutil@tempdima}}}
\pgflineto{\pgfpointadd{\centerpoint}{\pgfpoint{0pt}{ \pgfutil@tempdima}}}
\pgfmoveto{\pgfpointadd{\centerpoint}{\pgfpoint{-\pgfutil@tempdima}{0pt}}}
\pgflineto{\pgfpointadd{\centerpoint}{\pgfpoint{ \pgfutil@tempdima}{0pt}}}
\pgfusepathqstroke
}
\dspdeclareoperator{dspshapemixer}{
% Coordinate offset for the cross
\pgfutil@tempdima=\radius
\pgfutil@tempdima=0.707106781\pgfutil@tempdima
% Draw cross
\pgfmoveto{\pgfpointadd{\centerpoint}{\pgfpoint{-\pgfutil@tempdima}{-\pgfutil@tempdima}}}
\pgflineto{\pgfpointadd{\centerpoint}{\pgfpoint{ \pgfutil@tempdima}{ \pgfutil@tempdima}}}
\pgfmoveto{\pgfpointadd{\centerpoint}{\pgfpoint{-\pgfutil@tempdima}{ \pgfutil@tempdima}}}
\pgflineto{\pgfpointadd{\centerpoint}{\pgfpoint{ \pgfutil@tempdima}{-\pgfutil@tempdima}}}
\pgfusepathqstroke
}
\makeatother
% -------------------------------------------------------------------------
% Define node styles
\tikzset{dspadder/.style={shape=dspshapeadder,line cap=rect,line join=rect,
line width=\dspblocklinewidth,minimum size=\dspoperatordiameter}}
\tikzset{dspmultiplier/.style={shape=dspshapecircle,line cap=rect,line join=rect,
line width=\dspblocklinewidth,minimum size=\dspoperatordiameter}}
\tikzset{dspmixer/.style={shape=dspshapemixer,line cap=rect,line join=rect,
line width=\dspblocklinewidth,minimum size=\dspoperatordiameter}}
\tikzset{dspnodeopen/.style={shape=dspshapecircle,line width=\dsplinewidth,minimum size=\dspnoderadius}}
\tikzset{dspnodefull/.style={shape=dspshapecirclefull,line width=\dsplinewidth,fill,minimum size=\dspnoderadius}}
% The fixed specification of text height and text depth is the somewhat
% unaesthetic workaround to align the text in different node at the same
% baseline. See the PGF/TikZ manual, ch. 5.1.
\tikzset{dspsquare/.style={shape=rectangle,draw,align=center,text depth=0.3em,text height=1em,inner sep=0pt,
line cap=round,line join=round,line width=\dsplinewidth,minimum size=\dspsquareblocksize}}
\tikzset{dspfilter/.style={shape=rectangle,draw,align=center,text depth=0.3em,text height=1em,inner sep=0pt,
line cap=round,line join=round,line width=\dsplinewidth,minimum height=\dspsquareblocksize,minimum width=\dspfilterwidth}}
% -------------------------------------------------------------------------
% Define "signal flow" lines
\tikzset{dspline/.style={line width=\dsplinewidth},line cap=round,line join=round}
\tikzset{dspconn/.style={->,>=dsparrow,line width=\dsplinewidth},line cap=round,line join=round}%line cap=rect,line join=miter}
\tikzset{dspflow/.style={line width=\dsplinewidth,line cap=round,line join=round,
decoration={markings,mark=at position 0.5 with {\arrow{dsparrowmid}}},postaction={decorate}}}
% -------------------------------------------------------------------------
% Define various utility macros
\newcommand{\downsamplertext}[1]{\raisebox{0.1em}{$\big\downarrow$}#1}
\newcommand{\upsamplertext}[1]{\raisebox{0.1em}{$\big\uparrow$}#1}