如何使用 pgfplots 填充图表中曲线下方的区域

如何使用 pgfplots 填充图表中曲线下方的区域

我想将图表分成 3 个区域,并为每个区域填充一种颜色,并标注区域名称。查看代码(注释部分),我尝试对第一个区域执行此操作,但没有成功。我做错了什么,如何修复?

\documentclass[border=1mm]{standalone}
\usepackage[utf8]{inputenc}     % utf8 Codificacao do documento (conversão automática dos acentos)
\usepackage[siunitx,american]{circuitikz}
\usepackage{pgfplots}

\usetikzlibrary{arrows.meta,
    decorations.pathreplacing,
}



\begin{document}

% Definição do Estilo e dos Eixos   
\pgfplotsset{width=7cm,compat=newest,xmin=0,xmax=8500,ymin=2}

\begin{tikzpicture}

\begin{axis}[xlabel=Tempo(s), ylabel=Tensão (V),,grid=major,ytick distance=0.5]

\addlegendentry{Curva de Descarga}

% Plotagem dos Pontos para plotagem do gráfico

\addplot[color=red,mark=x] coordinates {    

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};
|- (axis cs:0,0) -- cycle;


% Preenchimento da área abaixo da curba

\addplot
[blue!80!black,fill=blue,fill opacity=0.5]
coordinates
{   
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}
|- (axis cs:0,0) -- cycle;


%\addplot
%[blue!80!black,fill=red,fill opacity=0.5]
%coordinates
%{  (4,12.15)
%   (5,12.12)
%   (6,12.08)   
%}
%|- (axis cs:0,0) -- cycle;

\end{axis}

\end{tikzpicture}
\end{document}

我的结果

代码结果

我想要的结果

在此处输入图片描述

答案1

您可以使用 fillbetween 来实现这一点。(编辑:添加了标签并用 替换了 ñ\~n以便能够进行编译pdflatex。)

\documentclass[border=1mm]{standalone}
\usepackage[utf8]{inputenc}     % utf8 Codificacao do documento (conversão automática dos acentos)
\usepackage[siunitx,american]{circuitikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usetikzlibrary{arrows.meta,
    decorations.pathreplacing,
}

\usepgfplotslibrary{fillbetween} % <-added


\begin{document}

% Definição do Estilo e dos Eixos   
\pgfplotsset{width=7cm,compat=newest,xmin=0,xmax=8500,ymin=2}

\begin{tikzpicture}

\begin{axis}[xlabel=Tempo(s), ylabel=Tens\~ao (V),,grid=major,ytick distance=0.5]

\addlegendentry{Curva de Descarga}

% Plotagem dos Pontos para plotagem do gráfico

\addplot[color=red,mark=x,name path=A] coordinates {    

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};
|- (axis cs:0,0) -- cycle;

    \path [name path=B]
        (\pgfkeysvalueof{/pgfplots/xmin},2) --
        (\pgfkeysvalueof{/pgfplots/xmax},2);

    \addplot [green!50] fill between [
        of=A and B,
        soft clip={domain=0:1200},
    ];

    \addplot [purple!50] fill between [
        of=A and B,
        soft clip={domain=1200:6000},
    ];

    \addplot [blue!50] fill between [
        of=A and B,
        soft clip={domain=6000:8000},
    ];
    \path (600,3) node[rotate=90,font=\sffamily\large] {NAME 1}
    (3600,2.75) node[font=\sffamily\large] {NAME 2}
    (7000,2.75) node[rotate=90,font=\sffamily\large] {NAME 3};
\end{axis}

\end{tikzpicture}
\end{document}

在此处输入图片描述

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