軟剪輯不適用於曲線之間的陰影區域

Question

我一直在嘗試找到一種方法來對曲線之間的區域進行著色，但是當我嘗試使用 Softclip 在 LaTeX 中進行編碼時，一切都會關閉。我不知道該怎麼辦。

這是我的程式碼：

\documentclass[tikz, border=2mm]{standalone}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
  \begin{axis}[
    grid=both,
    axis lines=middle,
    xmin=-2, xmax=5,
    ymin=-5, ymax=10,
    xlabel={$x$},
    ylabel={$y$},
    legend style={at={(0.5,-0.15)}, anchor=north},
    ]

    \addplot[blue, domain=-2:5, samples=100, name path=A] {x^2 - 2*x};
    \addlegendentry{$y = x^2 - 2x$}

    \addplot[red, domain=-2:5, samples=100, name path=B] {4*x - x^2};
    \addlegendentry{$y = 4x - x^2$}

    % Create a path for the shaded region
    \path[name path=zero] (0,0) -- (0,8);

    % Shade the region between the two functions in red
    \addplot[red, fill, opacity=0.3] fill between[of=A and B, soft clip={domain=0:3}] \closedcycle;

  \end{axis}
\end{tikzpicture}

\end{document}

Answer 1

當我嘗試運行您的程式碼時，我看到以下訊息： ! Package pgfplots Error: 'name path' is undefined. Please load \usetikzlibrary {intersections} or \usepgfplotslibrary{fillbetween}.

所以我就這麼做了。我\usepgfplotslibrary{fillbetween}在序言中插入了。現在它似乎對我來說非常有效。

\documentclass[tikz, border=2mm]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\begin{document}

\begin{tikzpicture}
  \begin{axis}[
    grid=both,
    axis lines=middle,
    xmin=-2, xmax=5,
    ymin=-5, ymax=10,
    xlabel={$x$},
    ylabel={$y$},
    legend style={at={(0.5,-0.15)}, anchor=north},
    ]

    \addplot[blue, domain=-2:5, samples=100, name path=A] {x^2 - 2*x};
    \addlegendentry{$y = x^2 - 2x$}

    \addplot[red, domain=-2:5, samples=100, name path=B] {4*x - x^2};
    \addlegendentry{$y = 4x - x^2$}

    % Create a path for the shaded region
    \path[name path=zero] (0,0) -- (0,8);

    % Shade the region between the two functions in red
    \addplot[red, fill, opacity=0.3] fill between[of=A and B, soft clip={domain=0:3}] \closedcycle;

  \end{axis}
\end{tikzpicture}

\end{document}

只要這是你想要的...