pgfplots/tickz einfarbiger Balken mit Unterklammern

Question

Ich bin ein völliger Neuling bei tickz/pgfplot und mein Ziel ist es, einen einzelnen horizontalen Balken (mit Unterklammern) wie diesen zu erstellen:

Ich glaube, ich würde lieber mit beginnen pgfplotscolorbardrawstandalone, aber der Rest ist für mich ein echter Kampf. Kann jemand helfen?

Answer 1

Mit reinem TitankZ (ist nicht ganz einfach ...)Č

\documentclass[margin=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc, chains,
                decorations.pathreplacing, % must be after decorations.pathreplacing
                calligraphy
                }

\begin{document}
    \begin{tikzpicture}[
    node distance = 0pt,
      start chain = A going right,
      start chain = B going right,
BC/.style args = {#1/#2}{
    decorate,
    decoration={calligraphic brace, amplitude=6pt,
    pre =moveto, pre  length=1pt,
    post=moveto, post length=1pt,
    raise=#1},
    very thick,
    pen colour={#2}
    },
BL/.style = {font=\small, below=#1},
 M/.style args = {#1/#2}{baseline, fill=#1, 
    font=\small, label={[text height=1.2ex, text depth=0.2ex]right:#2}, 
    node distance=17mm},
 N/.style args = {#1/#2}{fill=#1, minimum width=#2, 
    minimum height=5mm, outer sep=0pt, node contents={}, 
    on chain=B},
                        ]

\node (a) [N=red/30mm];
\node (b) [N=orange/85mm];
\node (c) [N=purple/10mm];

\path   ([yshift=5mm] a.north west) --
    node (x) [M=orange/orange] {}
    node     [M=red/red, left=of x] {}
    node     [M=purple/purple, right=of x] {}
        ([yshift=5mm] c.north east);
    
\draw[BC=3pt/black] (a.south east) -- node[BL=7pt] {length = 30} (a.south west);
\draw[BC=3pt/black] (b.south east) -- node[BL=7pt] {length = 85} (b.south west);
\draw[BC=3pt/black] (c.south east) -- node[BL=7pt] {length = 10} (c.south west);
    \end{tikzpicture}
\end{document}

Nachtrag: Der pgfplotsCode ist etwas einfacher und deutlich kürzer:

\documentclass[margin=3mm]{standalone}
\usepackage{pgfplots}
\usetikzlibrary{calc, chains,
                decorations.pathreplacing, % must be after decorations.pathreplacing
                calligraphy
                }
\pgfplotsset{compat=1.18}


\begin{document}
    \begin{tikzpicture}[
BC/.style = {
    decorate,
    decoration={calligraphic brace, amplitude=6pt,
    pre =moveto, pre  length=1pt,
    post=moveto, post length=1pt,
    raise=#1, mirror},
    very thick,
    pen colour={black}
    },
BL/.style = {font=\small, below=#1},
BL/.default= 5mm
                    ]
\begin{axis}[
x=1mm, 
axis lines=none,
%
xbar stacked,
bar width=5mm,
xmin=0,
%
legend style={at={(0.5,0.58)}, draw=none, anchor=south,
              legend columns=-1, font=\small,
              /tikz/every even column/.append style={column sep=1em}
              },
                ]
\addplot coordinates{(30,0)};
\addplot coordinates{(85,0)};
\addplot coordinates{(10,0)};
    \legend{blue, red, brown}
%
\draw[BC=3.3mm] (0,  0) -- node[BL] {length = 30} ++(30,0);
\draw[BC=3.3mm] (30, 0) -- node[BL] {length = 85} ++(85,0);
\draw[BC=3.3mm] (115,0) -- node[BL] {length = 10} ++(10,0);
\end{axis}
    \end{tikzpicture}
\end{document}

Das Ergebnis ist ähnlich wie zuvor: