TikZ-Feynman – How to Draw Curved Lines Using TikZ-Feynman

tikz-feynmantikz-pgf

How can I draw curved lines outside the main diagram?

I've already drawn the diagram (white), but I need to add the red curved lines, how can I do it?
My (amazing) code is, compiled with LuaLaTeX, and using atom with the LaTex package I get this diagram, which is different from the diagram generated on overleaf using the same code:

\documentclass{standalone}
\usepackage{graphicx}
\usepackage{tikz}
\usepackage[compat=1.1.0]{tikz-feynman}
\begin{document}

    \begin{tikzpicture}
        \begin{feynman}
            \vertex (a);
            \vertex (b);
            \vertex (c);
            \vertex (d);
            \vertex (e);
            \diagram[thick, horizontal= a to e]{
                a -- [fermion]b[dot],
                c--[anti fermion]b,
                d--[anti fermion]b,
                e--[fermion]b,
            };
            \vertex[below=1em of a]{$a$};
            \vertex[below=1em of b]{$b$};
            \vertex[below=1em of c]{$c$};
            \vertex[below=1em of d]{$d$};
            \vertex[below=1em of e]{$e$};

        \end{feynman}
    \end{tikzpicture}
\end{document}

and this it is my output:

Best Answer

Compile with LuaLaTeX

\documentclass[tikz, border=1cm]{standalone}
\pagecolor{black}
\usetikzlibrary{calc}
\usepackage[]{tikz-feynman}
\begin{document}
    \begin{tikzpicture}[rotate=45, white]
        \begin{feynman}
            \vertex (a);
            \vertex (b);
            \vertex (c);
            \vertex (d);
            \vertex (e);
            \diagram[thick, horizontal= a to e]{
                a -- [fermion]b[dot],
                c--[anti fermion]b,
                d--[anti fermion]b,
                e--[fermion]b,
            };
            \vertex[below=1em of a]{$a$};
            \vertex[below=1em of b]{$b$};
            \vertex[below=1em of c]{$c$};
            \vertex[below=1em of d]{$d$};
            \vertex[below=1em of e]{$e$};
            \draw[->, thick, red, shorten <=0.4 cm, shorten >=0.4 cm] ($ (a)!0.1!(c) $) to[out=0, in=270] ($ (a)!0.9!(c) $) ;     
            \draw[->, thick, red, shorten <=0.4 cm, shorten >=0.4 cm] ($ (d)!0.1!(e) $) to[out=90, in=180] ($ (d)!0.9!(e) $) ;     
        \end{feynman}
    \end{tikzpicture}
\end{document}

Related Solutions

[Tex/LaTex] Drawing rectilinear curves in Tikz, aka an Etch-a-Sketch drawing

\draw (20,12) -- ++(2,0) -- ++(0,2) -- ++(-3,0) -- ++(45:3);

Use ++ before each new incremental coordinate to make it relative to the last one and put the pencil there.

Here's a complete example:

\documentclass{article}
\usepackage{tikz}
\begin{document}
\tikz\draw (20,12) -- ++(2,0) -- ++(0,2) -- ++(-3,0) -- ++(30:3) {[rounded corners=10pt]-- ++(5,0) -- ++(0,-6)} -- ++(-7,0) -- cycle;
\end{document}

Of course, combining this with the -| or |- path operators can simplify the code even further; the following two pieces of code produce the same result:

\tikz\draw (20,12) -- ++(2,0) -- ++(0,2) -- ++(3,0) -- ++(0,1) -- ++(1,0) -- ++(0,-3) -- ++(2,0);\par\bigskip

and

\tikz\draw (20,12) -| ++(2,2) -| ++(3,1) -- ++(1,0) |- ++(2,-3);

I don't think that defining commands in this case adds anything; in fact, I think it reduces the functionality of the existing syntax (which is already simple). The example demonstrates that you can use, for example, polar coordinates and modify (up to TikZ limitations) the path attributes midways; even if the current question doesn't require this, it's a good thing to have the possibility to do those kind of modification if they are required.

[Tex/LaTex] How to draw a square and its diagonals with arrows

\documentclass{article}       
\usepackage{tikz}     
\begin{document}   
\begin{tikzpicture}
\node[circle, draw=black, fill=black, name=0] at (0,0) {};
\node[xshift=-2mm] at (0.west) {0};

\node[circle, draw=black, fill=black, name=1] at (0,1) {};
\node[xshift=-2mm] at (1.west) {1};

\node[circle, draw=black, fill=black, name=3] at (1,0) {};
\node[xshift=2mm] at (3.east) {3};

\node[circle, minimum width=1pt, draw=black, fill=black, name=2] at (1,1) {};
\node[xshift=2mm] at (2.east) {2};


\draw[->, blue] (0) -- (2);
\draw[->, blue] (0) -- (3);
\draw[->, blue] (0) -- (1);
\draw[->, blue] (1) -- (2);
\draw[->, blue] (1) -- (3);
\draw[->, blue] (2) -- (3);

\end{tikzpicture}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Drawing rectilinear curves in Tikz, aka an Etch-a-Sketch drawing

[Tex/LaTex] How to draw a square and its diagonals with arrows

Related Question