[Tex/LaTex] Bending an arrow in circuiTikz

arrowscircuitikztikz-arrowstikz-pgf

I've made a circuit with circuiTikz and I have the following problem: how to bend the arrow which is above number 1? Here is the photo of the circuit:

So how to bend the arrow to get an arrow something like this:

I give you the coding I've made so far.

\documentclass[12pt]{article}
\usepackage[siunitx]{circuitikz}
\usetikzlibrary{arrows}
\definecolor{a}{rgb}{.75,.75,.75}
\begin{document}
\begin{center}
\begin{circuitikz}
\draw[color=a,dashed](-8,-8)grid(8,8);
%\draw[fill=black](0,0)circle[radius=.55mm];
\draw
(0,0)node[transformer core](T){}
(T.A1)to[lamp](-4,0)
      to[L,l=45 mT](-4,-2.1)
      to[short](T.A2)
;

\draw
(-3.5,0)to[short,*-](-3.5,2)
        to[voltmeter](-1.5,2)
        to[short,-*](-1.5,0)
;

\draw
(T.B1)to[short](4,0)
      to[vsourcesin,l=110 V](4,-2.1)
      to[push button](T.B2)
;

\draw
(-1,-2.1)to[short,*-](-1,-4)
         to[empty led](-3.5,-4)
         to[short,-*](-3.5,-2.1)
;

\draw[thick,-latex](.4,.2)--(-.4,.2);
\node[below]at(0,.2){1};
\draw(0,.4)node{\footnotesize 1.4 V$\leftarrow$ 110 V};
\end{circuitikz}
\end{center}
\end{document}
\end{document}

Please, do not change the codes, just bend the arrow which is above number 1. You can change the codes if you have a much much better way to draw it. Help me out of this, please.

Best Answer

Instead of lines in your MWE

\draw[thick,-latex](.4,.2)--(-.4,.2);
\node[below]at(0,.2){1};
\draw(0,.4)node{\footnotesize 1.4 V$\leftarrow$ 110 V};

try, if the following gives, what you like to obtain:

\draw[thick,-latex,shorten >=2mm, shorten <=2mm,in=30, out=150] 
    (T.north east) to node[above] {\footnotesize 1.4 V $\leftarrow$ 110 V} (T.north west);

Related Solutions

[Tex/LaTex] Defining a \newcommand for environment in CircuiTikz

You cannot have numbers in macro names (at least not without some trickery).

The following works fine:

\documentclass{article}
\usepackage{circuitikz}

\begin{document}

\newcommand\opampfive[5]
{
\begin{circuitikz}
\draw (0,0) node[op amp] (opamp) {};
\draw (-2,-0.49) to[short, o-] (opamp.+) (-2.2,-0.49) node[anchor=east] {${#1}$};
\draw (-2,0.49) to[short, o-] (opamp.-) (-2.2,0.49) node[anchor=east] {${#2}$};
\draw (-0.08,1.5) to[short, o-] (opamp.up) (-0.08,1.6) node[anchor=south] {${#3}$};
\draw (-0.08,-1.5) to[short, o-] (opamp.down) (-0.08,-1.6) node[anchor=north] {${#5}$};
\draw (1,0) to[short, -o] (2,0) -- (opamp.out) (2.1,0) node[anchor=west] {${#4}$};
\end{circuitikz}
}

\opampfive{1}{2}{3}{4}{5}
\end{document}

[Tex/LaTex] Rotate a node but not its content: the case of the ellipse decoration

The source of the difficulty is that ellipses are constructed in a particular way in TikZ. They are paths that start from the x-axis and proceed counter-clockwise around their centre. The vast majority of the time, the exact parametrisation doesn't matter. You appear to have found the one situation where it does!

In the actual question, you only want to be able to mirror the ellipse, and so draw it starting from the negative x-axis (the title of the question suggests a more flexible approach). That's actually not too hard since we can exploit the symmetry of the ellipse. The key is to provide it with a negative x-radius, since then it will start from the negative x-axis (and proceed clockwise, but we could correct for that by negating the y-radius as well). To do this, we interrupt the call from the node shape to the drawing command and flip the sign of the x-radius. The simplest way to do this is to redefine the \pgfpathellipse macro to do the negation and then call the original macro. The following code does this.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations,shapes,decorations.markings}
\makeatletter
\let\origpgfpathellipse=\pgfpathellipse
\def\revpgfpathellipse#1#2#3{%
  #2%
  \pgf@xa=-\pgf@x
  \origpgfpathellipse{#1}{\pgfqpoint{\pgf@xa}{0pt}}{#3}}
\makeatother

\tikzset{
  reversed ellipse/.style={
    ellipse,
    reverse the ellipse%
  },
  reverse the ellipse/.code={
    \let\pgfpathellipse=\revpgfpathellipse
  }
}
\begin{document}
\begin{tikzpicture}
\node[ellipse,
  draw,
  postaction={
    decorate,
    decoration={
      markings,
      mark=at position 1 with {
        \arrow[line width=5pt,blue]{>}
      }
    }
  }
] at (0,0) {hello world};

\node[reversed ellipse,
  draw,
  postaction={
    decorate,
    decoration={
      markings,
      mark=at position 1 with {
        \arrow[line width=5pt,blue]{>}
      }
    }
  }
] at (0,-2) {hello world};
\end{tikzpicture}

\end{document}

Here's the result:

rotated ellipse

(the arrow got clipped, but you can see where it lies)

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