I've been using tikZ matrices to generate some really wonderful block diagrams. However, I feel I have no control over the final placement as they always come out too far to the right. I tried using the positioning library but I wasn't able to move the block diagram at all.
Below is some code that is an example of what I'm working with. I would like to know how to control the placement of the block diagram so that I can center it better. Any advice would be much appreciated.
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc,arrows,positioning}
\begin{document}
\pgfdeclarelayer{background}
\pgfsetlayers{background,main}
\tikzset{every node/.style={scale=0.750}}
% define styles
\tikzstyle{sumJunction} = [draw, circle,inner sep=2pt,minimum size=3pt,] % use this style to show routing points
\tikzstyle{controller} = [draw, fill=blue!20, text width=5em,text centered, minimum height=4em]
\tikzstyle{plant} = [draw, fill=red!20, text width=5em,text centered, minimum height=3em]
\tikzstyle{point} = [coordinate]
\tikzstyle{separator} = [minimum size=12mm]
\tikzstyle{scalarSignal} = [draw,-latex']
\tikzstyle{vectorSignal} = [scalarSignal,line width=1.5pt]
\tikzstyle{nonTerminal} = [-]
\parindent0pt
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\begin{tikzpicture}
% blocks
\matrix [row sep=1mm,column sep=2mm] {
\path node [separator] (p1) {}; &
% sum
\path (p1.east) node (sum1) [sumJunction] {+};
\path ($(sum1)!3.0!(sum1.west)$) node [point,label=above:$r$] (u1) {}; &
\path (sum1.east) node [separator] (p1a) {}; &
% C
\path (sum1.east) node (blockC) [controller] {C}; &
% r
\path (blockC.east) node (p2a) {}; &
% H
\path (p2a.east) node (blockH) [controller] {H}; &
% separator column
\path (blockH.east) node (p22) [separator] {}; &
% CPU & GPU
\path (blockH.-60 -| p22.east) node (Z) [plant] {Z};
\path (blockH.60 -| p22.east) node (Y) [plant] {Y}; &
% signal - f
\path (Y.east |- p22) node (sum2) [sumJunction] {+}; &
% separator column
\path (sum2.east) node (p3) {}; &
% F
\path (p3) node (blockF) [plant] {F}; &
% signal - y
\path (blockF.east) node [point,label=above:$y$] (p51a) {};
\\};
% signal lines
% r -> sum1
\path [scalarSignal] ($(sum1)!6.0!(sum1.west)$) -> (sum1.west);
% sum1 -> C
\path [scalarSignal] (sum1) -> (blockC);
% C -> H
\path [scalarSignal] (blockC) -> (blockH);
% H -> CPU & GPU
\path [scalarSignal] (blockH.-20) -- (blockH.-20 -| p22) |- (Z);
\path [scalarSignal] (blockH.20) -- (blockH.20 -| p22) |- (Y);
% CPU & GPU -> F
\path [scalarSignal] (Y) -| (sum2);
\path [scalarSignal] (Z) -| (sum2);
% sum2 -> F
\path [scalarSignal] (sum2) -> (blockF);
% F -> sum1
\path ($(blockF)!1.5!(Z.south -| blockF.east)$) node (a) {};
\path (a -| sum1) node (b) {};
\path [scalarSignal] (blockF.east) -| (a.base) -- (b.base) -> (sum1);
\begin{pgfonlayer}{background}
\path ($(blockC)!1.5!(blockC.south west)$) node (a) {};
\path ($(blockH)!1.5!(blockH.north east)$) node (b) {};
\path[fill=blue!10, draw=black!50]
(a) rectangle (b);
\path ($(Z)!1.5!(Z.south west)$) node (a) {};
\path ($(blockF)!1.25!(Y.north -| blockF.east)$) node (b) {};
\path[fill=red!10, draw=black!50]
(a) rectangle (b);
\end{pgfonlayer}
\end{tikzpicture}
\parindent0pt
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\end{document}
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