填充形状的各个部分

Question

您能告诉我如何填充形状的突出显示部分吗fill=gray!60？

一如既往地感谢您。

\documentclass[]{article}
\usepackage[margin=0.5in]{geometry}
\usepackage{pgfplots}
\usepackage{mathtools}
\usepackage{pgfplots}
\usepackage{amsmath}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
    %\draw[thick,latex-latex,yshift=-0.3cm](-138-6:2.5) arc(-138-6:-38+6:2.5) node[midway,left,fill=white]{L};
    %   
    \draw[thick] (0,0) -- (36.87:4) --+ (-53.13:3) --cycle;
    %\draw[thick] (0,0) --  (-138-5:2.5) arc(-138-5:-38+5:2.5) -- cycle;
    %
    \draw[thick,rotate around={-90-53.13:(3.2,2.4)}](3.2,2.4) rectangle (3.5,2.7);
    %\draw[thick,black,dashed](0,+3.65) --(1.14,+3.65);
    \node[above] at (3.3,2.5) {\large $A$};
    \node[left] at (0.3,-0.26) {\large $B$};
    \node[right] at (4.7,-0.26) {\large $C$};
    %
    %\draw[thick,fill=black] (0,+3.65) circle (0.2mm);
    %
    \draw[thick,rotate around={36.87:(0,0)}] (0,0) arc(180:0:2);
    \draw[thick] (0,0) arc(180:0:2.5);
    \draw[thick,rotate around={-52.73:(3.2,2.4)}] (3.2,2.4) arc(180:0:1.5);
\end{tikzpicture}
\end{document}

Answer 1

最简单的方法可能是先绘制三个圆弧，然后将大圆弧填充为白色（或当前背景颜色）。

\documentclass[border=10pt]{standalone}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
    \draw[thick, fill=gray!60, rotate around={36.87:(0,0)}] (0,0) arc (180:0:2);
    \draw[thick, fill=gray!60, rotate around={-52.73:(3.2,2.4)}] (3.2,2.4) arc (180:0:1.5);
    \draw[thick, fill=white] (0,0) arc (180:0:2.5);

    \draw[thick] (0,0) -- (36.87:4) -- +(-53.13:3) -- cycle;
    \draw[thick, rotate around={-90-53.13:(3.2,2.4)}](3.2,2.4) rectangle (3.5,2.7);

    \node[above] at (3.3,2.5) {\large $A$};
    \node[left] at (0.3,-0.26) {\large $B$};
    \node[right] at (4.7,-0.26) {\large $C$};
\end{tikzpicture}
\end{document}

但更好的方法是将三条弧线绘制为一条路径，然后可以轻松填充。为此，您只需将计算直接应用于语句内的度数arc（使用此方法，您也可以将其他语句更改为仅使用 36.87 的倍数）：

\documentclass[border=10pt]{standalone}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
    \draw[thick] (0,0) -- (36.87:4) -- ++({-90+36.87}:3) -- cycle;
    \draw[thick, rotate around={{180+36.87}:(3.2,2.4)}](3.2,2.4) rectangle (3.5,2.7);

    \node[above] at (3.3,2.5) {\large $A$};
    \node[left] at (0.3,-0.26) {\large $B$};
    \node[right] at (4.7,-0.26) {\large $C$};
    
    \draw[thick, fill=gray!60] (0,0) arc ({180+36.87}:{0+36.87}:2) arc
        ({90+36.87}:{-90+36.87}:1.5) arc (0:180:2.5) -- cycle;
\end{tikzpicture}
\end{document}