% Author: Prof. Dr. Matthias Jung, DL9MJ
% Year: 2026
\begin{tikzpicture}
    \pgfplotsset{samples=200}
    \begin{axis}[
        axis on top,
        axis lines=middle,
        height=6cm,
        scale only axis,
        width=\linewidth*\getDarcImageFactor,
        ticks=none,
        axis line style={-Triangle},
        xticklabel style={/pgf/number format/.cd,fixed,precision=1,use comma,fixed,fixed zerofill},
        xmin =  0,
        ymin = -2.5,
        xmax =  3*pi,
        ymax =  3,
        domain = 0:3*pi,
        thick,
        smooth,
        no markers]
        \addplot+[name path=A,ultra thick, black] { 0.75*sin(deg(x))+1.5};
        \addplot+[name path=B,ultra thick, black] {-0.75*sin(deg(x))-1.5};
        \addplot[DARCgray] fill between[of=A and B];

        \path(axis cs: 0.5*pi, 2.25) -- (axis cs: 0.5*pi, 2.75) coordinate(s1);
        \path(axis cs: 1.5*pi, 0.75) -- (axis cs: 1.5*pi, 2.75) coordinate(e1);
        \path(axis cs: 1.5*pi, 0.75) -- (axis cs: 1.5*pi, 2.75) coordinate(s2);
        \path(axis cs: 2.5*pi, 2.25) -- (axis cs: 2.5*pi, 2.75) coordinate(e2);
        \path(axis cs: 2.5*pi, 0.00) coordinate(s3);
        \path(axis cs: 2.5*pi, 2.25) coordinate(e3);
        \path(axis cs: 1.5*pi, 0.00) coordinate(s4);
        \path(axis cs: 1.5*pi, 0.75) coordinate(e4);

        \draw[dashed] (axis cs: 0, 1.5+0.75) -- (axis cs: 3*pi, 1.5+0.75);
        \draw[dashed] (axis cs: 0, 1.5-0.75) -- (axis cs: 3*pi, 1.5-0.75);
    \end{axis}
    \DARCmeasure{s3}{e3}{0,0}{90}{\rotatebox{-90}{$U_\text{max}$}}
    \draw[Triangle-Triangle] (s4) -- (e4) node[midway,anchor=east]{$U_\text{min}$};
\end{tikzpicture}