tikz-pgfvector
Is there a way to easy achieve this result?
Something like the symbol recommended from wikipedia but with the dot of the vector bigger.
And is it possibile to do that in \tikzset ,I was triyng something like
\tikzset{mystyle/.style={draw, circle}}
\node[mystyle] (nodename) {} ;
But this draws only the circle around… I was surprised not to find anything, so maybe this is a possible duplicate.
Try drawing the small circle after the large one, so its fill will cover the arc inside of it. Basically, you should place a \coordinate at the location you want its center to be, and then draw both circles relative to that point.
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{through}
\begin{document}
\begin{tikzpicture}
\coordinate (u) at (0,0);
\node [draw,circle through=(u)] at (1,0) {};
\node [draw,circle,fill=white,minimum size=1mm] at (u) {};
\end{tikzpicture}
\end{document}
To put a drawing into a block, I advise you to create some macros with your drawings and put them in the nodes as in the example below
\documentclass[border=10]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}
\newcommand{\symbolA}{
\tikz \draw[red] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}
\newcommand{\symbolB}{
\tikz[y={(0,-1)}] \draw[blue] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}
\newcommand{\symbolC}{
\begin{tikzpicture}
\draw[fill=green] (0,0) circle (0.2cm);
\end{tikzpicture}
}
\begin{document}
\begin{tikzpicture}
\node[draw](A) at (0,0){\symbolA};
\node[draw, right=2em of A] (B) {\symbolB};
\node[draw, right=2em of B] (C) {\symbolC};
\draw[-latex] (A) -- (B);
\draw[-latex](B) -- (C);
\end{tikzpicture}
\end{document}
of course you can use it with the code you quote
\documentclass[border=10]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes,arrows}
\newcommand{\symbolA}{
\tikz \draw[red] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}
\newcommand{\symbolB}{
\tikz[y={(0,-1)}] \draw[blue] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}
\newcommand{\symbolC}{
\begin{tikzpicture}
\draw[fill=green] (0,0) circle (0.2cm);
\end{tikzpicture}
}
\begin{document}
\tikzstyle{block} = [draw, fill=blue!20, rectangle,
minimum height=3em, minimum width=6em]
\tikzstyle{sum} = [draw, fill=blue!20, circle, node distance=1cm]
\tikzstyle{input} = [coordinate]
\tikzstyle{output} = [coordinate]
\tikzstyle{pinstyle} = [pin edge={to-,thin,black}]
% The block diagram code is probably more verbose than necessary
\begin{tikzpicture}[auto, node distance=2cm,>=latex']
% We start by placing the blocks
\node [input, name=input] {};
\node [sum, right of=input] (sum) {};
\node [block, right of=sum] (controller) {\symbolA};
\node [block, right of=controller, pin={[pinstyle]above:Disturbances},
node distance=3cm] (system) {\symbolB};
% We draw an edge between the controller and system block to
% calculate the coordinate u. We need it to place the measurement block.
\draw [->] (controller) -- node[name=u] {$u$} (system);
\node [output, right of=system] (output) {};
\node [block, below of=u] (measurements) {\symbolC};
% Once the nodes are placed, connecting them is easy.
\draw [draw,->] (input) -- node {$r$} (sum);
\draw [->] (sum) -- node {$e$} (controller);
\draw [->] (system) -- node [name=y] {$y$}(output);
\draw [->] (y) |- (measurements);
\draw [->] (measurements) -| node[pos=0.99] {$-$}
node [near end] {$y_m$} (sum);
\end{tikzpicture}
\end{document}
But you can also use the Schemabloc package: http://www.texample.net/tikz/examples/schemabloc/.
Best Answer
Yes. One option is to use
pics.EDIT: With relative line widths: