We would like to make an image to illustrate the construction of a spiral capacitor. These are made of spiral coiled films. It’s like a rectangular paper tailed around one side.
\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.8}
\pgfplotsset{
colormap/outside/.style={
colormap=
{outside}{
rgb255(0cm)=(110,110,255);
rgb255(1cm)=(20,20,255);
}
},
colormap/outside,
colormap/inside/.style={
colormap={inside}{
rgb255(0cm)=(20,20,255);
rgb255(1cm)=(220,220,255);
}
},
colormap/inside
}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
hide axis,
axis equal image,
z buffer=sort,
view={30}{40},
width=15cm
]
\addplot3 [
surf,
domain=0:3*360,
samples=100,
y domain=0:2000,
samples y=2,
line join=round,
mesh/interior colormap name=inside,
colormap/outside,
shader=faceted,
variable=\t,
point meta={cos(t)},
faceted color=black,
]
( {cos(t)*1.1*t},{sin(t)*1.1*(t)},{y} );
\end{axis}
\end{tikzpicture}
\end{document}