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填充区域

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填充区域

又一天，又一个问题！这次我不明白为什么填充后，tikz 会留下这样的空白

在此处输入图片描述

\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}[scale=0.7]
\coordinate (O) at (0,0);
\coordinate (I) at (12,0);

\coordinate (C1) at (4,0);
\coordinate (C2) at (7,0);

\draw ($ (O)+(-1,0) $) -- ($ (I)+(1,0) $);%asse ottico

\draw [very thick] (C1)++(75:-3) node (A1) {A1} arc (75:-75:-3) node (B1) 
{B1};
\draw [very thick] (C2)++(75:3) node (A2) {A2} arc (75:-75:3) node (B2) {B2};

\begin{scope}
\clip (C1)++(75:-3) arc (75:-75:-3) -- (A2) -- (C2)++(75:3) arc (75:-75:3) -- 
(A1);
\filldraw [color=lightgray, opacity=0.6] (-10,-10) rectangle (20,10);
\end{scope}
\end{tikzpicture}
\end{document}

答案1

您甚至不需要clip在这里。问题是您++在路径中使用了增量。您可以对第一个坐标执行此操作，但如果对其他坐标执行此操作，则路径会出现“跳跃”。然而，当您正在加载时calc，您可以这样做

\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}[scale=0.7]
\coordinate (O) at (0,0);
\coordinate (I) at (12,0);

\coordinate (C1) at (4,0);
\coordinate (C2) at (7,0);

\draw ($ (O)+(-1,0) $) -- ($ (I)+(1,0) $);%asse ottico

\draw [very thick] (C1)++(75:-3) node (A1) {A1} arc (75:-75:-3) node (B1) 
{B1};
\draw [very thick] (C2)++(75:3) node (A2) {A2} arc (75:-75:3) node (B2) {B2};

\fill[color=lightgray, opacity=0.6](C1)++(75:-3) arc (75:-75:-3) 
-- ($(C2)+(75:3)$) arc (75:-75:3) -- cycle ;
\end{tikzpicture}
\end{document}

在此处输入图片描述

但是，由于您已经有命名节点，因此可以将其简化为

\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{calc,backgrounds}
\begin{document}
\begin{tikzpicture}[scale=0.7]
\coordinate (O) at (0,0);
\coordinate (I) at (12,0);

\coordinate (C1) at (4,0);
\coordinate (C2) at (7,0);

\draw ($ (O)+(-1,0) $) -- ($ (I)+(1,0) $);%asse ottico

\draw [very thick] (C1)++(75:-3) node (A1) {A1} arc (75:-75:-3) node (B1) 
{B1};
\draw [very thick] (C2)++(75:3) node (A2) {A2} arc (75:-75:3) node (B2) {B2};

\begin{scope}[on background layer]
\fill[color=lightgray, opacity=0.6](A1.center)  arc (75:-75:-3) -- 
    (A2.center) arc (75:-75:3) -- cycle ;
\end{scope}
\end{tikzpicture}
\end{document}

在此处输入图片描述

这里我也把填充放上了background layer。

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