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I have a simple question but I can not find a solution : How can I get a simple snake arrow but with a rainbow color?

  • 1
    Welcome! You can either use path fading or clip. – user194703 Jan 20 '20 at 22:40
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Welcome! All important ingredients of this answer are from here.

\documentclass[tikz,border=3mm]{standalone}
\usetikzlibrary{shadings,fadings,arrows.meta,bending,decorations.pathmorphing}
\pgfdeclarehorizontalshading{rainbow}{100bp}{% https://tex.stackexchange.com/a/344548/194703
  rgb(0bp)=(1,0,0);
  rgb(26bp)=(1,0,0);
  rgb(33bp)=(1,.5,0);
  rgb(40bp)=(1,1,0);
  rgb(47bp)=(0,1,0);
  rgb(54bp)=(0,1,1);
  rgb(61bp)=(0,0,1);
  rgb(68bp)=(1,0,1);
  rgb(75bp)=(.5,0,.5);
  rgb(100bp)=(.5,0,.5)}
\begin{tikzfadingfrompicture}[name=my arrow]
 \draw[transparent!0,ultra thick,decorate,decoration={snake,post length=2mm},
 -{Stealth}] (0,0) -- (2,0);
\end{tikzfadingfrompicture}%
\begin{document}
\begin{tikzpicture}
 \path [ postaction={shading=rainbow, path fading=my arrow, fit fading=false}] 
 (-1,-0.2) rectangle (1,0.2);
\end{tikzpicture}
\end{document}

enter image description here

BTW, for the future it would be great if you could post what you have tried.

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