TikZ 缩放不会改变圆弧的大小

Question

我画了下图：

如您所见，圆弧对于页面来说太大了。因此，我尝试使用 缩放图像[scale=0.5]。

这对于直线段非常有效。然而，TikZ 不会缩放圆弧，而是改变其大小，而是让圆弧的中心彼此更接近。

这是第一张图片的 MWE。

\documentclass[a4paper]{article}
\usepackage{tikz}
\tikzset{
    pics/carc/.style args={#1:#2:#3}{
        code={
            \draw[pic actions] (#1:#3) arc(#1:#2:#3);
        }
    }
}
\begin{document}


\begin{figure}[htbp]
    \centering
    \begin{tikzpicture}[scale=0.5]
    \tikzstyle{disk} = [draw, thick, circle,fill=none]
    \tikzstyle{center} = [draw,shape=rectangle,fill=blue]
    \tikzstyle{intersection} = [draw, circle ,fill=darkgray, inner sep=0.8mm]
    \node at (-6,0) {$A$};
    \node at (1,0) {$B$};
    \node at (-2,-6) {$C$};
    \draw[thick] (-8,0)  pic{carc=-100:50:60mm};
    \draw[thick] (2,0)  pic{carc=130:300:60mm};
    \draw[thick,red] (3.2,0)  pic{carc=130:300:60mm};
    \draw[thick] (-2,-14)  pic{carc=30:150:100mm};
    \draw[dashed] (-3,6)--(-3, -6);
    \draw[red] (-2.8,6)--(-2.8, -6);
    \draw[blue] (-2.2,6)--(-2.2, -6);
    \end{tikzpicture}
    \caption{Zoomed in}
    \label{fig:zoom}
\end{figure}

\end{document}

我该怎么做才能缩放弧线？

Answer 1

您可以使用transform shape，请参阅 TikZ 和 PGF 手册 (针对版本 3.0.1a) 第 17.7 节。

顺便说一下，也请看一下这篇文章：应该使用 \tikzset 还是 \tikzstyle 来定义 TikZ 样式？。

\documentclass[a4paper]{article}
\usepackage{tikz}
\tikzset{
    pics/carc/.style args={#1:#2:#3}{
        code={
            \draw[pic actions] (#1:#3) arc(#1:#2:#3);
        }
    }
}
\begin{document}
    \begin{figure}[htbp]
        \centering
        \begin{tikzpicture}[
            scale=0.5, 
            transform shape,
            disk/.style={draw, thick, circle, fill=none},
            center/.style={draw,shape=rectangle,fill=blue},
            intersection/.style={draw, circle, fill=darkgray, inner sep=0.8mm}
            ]
            \node at (-6,0) {$A$};
            \node at (1,0) {$B$};
            \node at (-2,-6) {$C$};
            \draw[thick] (-8,0) pic{carc=-100:50:60mm};
            \draw[thick] (2,0) pic{carc=130:300:60mm};
            \draw[thick,red] (3.2,0) pic{carc=130:300:60mm};
            \draw[thick] (-2,-14) pic{carc=30:150:100mm};
            \draw[dashed] (-3,6) -- (-3,-6);
            \draw[red] (-2.8,6) -- (-2.8,-6);
            \draw[blue] (-2.2,6) -- (-2.2,-6);
        \end{tikzpicture}
        \caption{Zoomed in\label{fig:zoom}}
    \end{figure}
\end{document}

或者，如果您不想更改节点文本大小，请仅将其添加到带有图片的绘图中：

\documentclass[a4paper]{article}
\usepackage{tikz}
\tikzset{
    pics/carc/.style args={#1:#2:#3}{
        code={
            \draw[pic actions] (#1:#3) arc(#1:#2:#3);
        }
    }
}
\begin{document}
    \begin{figure}[htbp]
        \centering
        \begin{tikzpicture}[
            scale=0.5, 
            disk/.style={draw, thick, circle, fill=none},
            center/.style={draw,shape=rectangle,fill=blue},
            intersection/.style={draw, circle, fill=darkgray, inner sep=0.8mm}
            ]
            \node at (-6,0) {$A$};
            \node at (1,0) {$B$};
            \node at (-2,-6) {$C$};
            \draw[thick,transform shape,
            ] (-8,0) pic{carc=-100:50:60mm};
            \draw[thick,transform shape] (2,0) pic{carc=130:300:60mm};
            \draw[thick,red,transform shape] (3.2,0) pic{carc=130:300:60mm};
            \draw[thick,transform shape] (-2,-14) pic{carc=30:150:100mm};
            \draw[dashed] (-3,6) -- (-3,-6);
            \draw[red] (-2.8,6) -- (-2.8,-6);
            \draw[blue] (-2.2,6) -- (-2.2,-6);
        \end{tikzpicture}
        \caption{Zoomed in\label{fig:zoom}}
    \end{figure}
\end{document}

Answer 2

图片缩放不正确。您应该在 carc 定义中单独设置 scale=0.5

  \documentclass[a4paper]{article}
\usepackage{tikz}
\tikzset{
    pics/carc/.style args={#1:#2:#3}{
        code={
            \draw[pic actions,scale=0.5] (#1:#3) arc(#1:#2:#3);
        }
    }
}
\begin{document}


    \begin{figure}[htbp]
        \centering
        \begin{tikzpicture}[scale=0.5]
        \tikzstyle{disk} = [draw, thick, circle,fill=none]
        \tikzstyle{center} = [draw,shape=rectangle,fill=blue]
        \tikzstyle{intersection} = [draw, circle ,fill=darkgray, inner sep=0.8mm]
        \node at (-6,0) {$A$};
        \node at (1,0) {$B$};
        \node at (-2,-6) {$C$};
        \draw[thick] (-8,0)  pic{carc=-100:50:60mm};
        \draw[thick] (2,0)  pic{carc=130:300:60mm};
        \draw[thick,red] (3.2,0)  pic{carc=130:300:60mm};
        \draw[thick] (-2,-14)  pic{carc=30:150:100mm};
        \draw[dashed] (-3,6)--(-3, -6);
        \draw[red] (-2.8,6)--(-2.8, -6);
        \draw[blue] (-2.2,6)--(-2.2, -6);
        \end{tikzpicture}
        \caption{Zoomed in}
        \label{fig:zoom}
    \end{figure}

\end{document}