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Tikz 从内径到外径绘制圆壳

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Tikz 从内径到外径绘制圆壳

有没有办法在环境中从内径到外径画一个圆tikzpicture？我想避免使用 pstricks，例如这个答案。

与本 MWE 类似，但无需绘制圆/节点乙多于A（添加不透明度 =.5 来显示圆 A 的“不需要的”内部部分）：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{%
    shapes.misc,    % additional shapes, such as rounded rectangles
    positioning,    % advanced positioning
}

\begin{document}
\begin{tikzpicture}[%
    roundnode/.style={circle, draw=black, fill=white, thick, inner sep=0em, opacity=1, fill opacity=1, draw opacity=1, font=\small},
    ]
    \node[roundnode, minimum size=15mm, fill=red!20] (nodeA) at (1, 0) {};
    \node[roundnode, minimum size=5mm, fill opacity=.5] (nodeB) at (1, 0) {B};  
\end{tikzpicture}
\end{document}

答案1

您需要[even odd rule]for \fill。此外，您还需要节点的半径，即最小尺寸的一半。

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{%
    shapes.misc,    % additional shapes, such as rounded rectangles
    positioning,    % advanced positioning
}

\begin{document}
\begin{tikzpicture}[%
    roundnode/.style={circle, draw=black, fill=white, thick, inner sep=0em, opacity=1, fill opacity=1, draw opacity=1, font=\small},
    ]
    \node[roundnode, minimum size=15mm] (nodeA) at (1, 0) {};
    %\path (nodeA.north);
    %\pgfgetlastxy{\xa}{\ya}
    \node[roundnode, minimum size=5mm] (nodeB) at (1, 0) {B};
    %\path (nodeB.north);
    %\pgfgetlastxy{\xb}{\yb}
    %\fill[even odd rule, red] (1,0) circle[radius=\yb] circle[radius=\ya];
    \fill[even odd rule, red] (1,0) circle[radius=7.5mm] circle[radius=2.5mm];
    
\end{tikzpicture}
\end{document}

演示

答案2

使用填充even odd rule。

\documentclass{standalone}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
    \draw [thick,fill=red!20,even odd rule] (1,0) circle (7.5mm) (1,0) circle (2.5mm);
\end{tikzpicture}
\end{document}

输出

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