我尝试使用 tikz 并排绘制一些结,然后给它们贴上标签,但它无法与我的代码配合使用。我使用包:caption、subcaption、tikz(结)。
\usepackage[utf8]{inputenc}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{tikz}
\usetikzlibrary{matrix, arrows, knots}
\usepackage{graphicx}
\begin{document}
\begin{figure}
\begin{subfigure}[b]{0.45\textwidth}
\centering
\resizebox{\linewidth}{!}{
\begin{tikzpicture}
\foreach \brk in {0,1,2} {
\begin{scope}[rotate=\brk * 120]
\node[knot crossing, transform shape,
inner sep=1.5pt] (k\brk) at (0,-1) {};
\end{scope}
}
\foreach \brk in {0,1,2} {
\pgfmathparse{int(Mod(\brk - 1,3))}
\edef\brl{\pgfmathresult}
\draw[thick,red] (k\brk) .. controls (
k\brk.4 north west) and (k\brl.4 north east) .. (k\brl.center);
\draw[thick,red] (k\brk.center) .. controls (k\brk.16 south west) and (k\brl.16 south east) .. (k\brl);
}
\end{tikzpicture}
}
\caption{Trefoil}
\label{a}
\end{subfigure}
\begin{subfigure}[b]{0.45\textwidth}
\centering
\resizebox{\linewidth}{!}{
\begin{tikzpicture}
\def\foil{3}
\foreach \brk in {1,...,\foil} {
\begin{scope}[rotate=\brk * 360/\foil]
\node[transform shape, knot crossing, inner sep=1.5pt] (k\brk) at (0,-1) {};
\end{scope}
}
\draw[thick,red] (0,0) \foreach \brk in {1,...,\foil} {let \na=\brk, \nb={int(Mod(\brk,\foil)+1)}, \nc={int(Mod(\brk+1,\foil)+1)} in (k\na) .. controls (k\na.16 south east) and (k\nb.16 south west) .. (k\nb.center) .. controls (k\nb.4 north east) and (k\nc.4 north west) .. (k\nc)};
\end{tikzpicture}
}
\caption{Cinquefoil}
\label{b}
\end{subfigure}
\end{figure}
\caption{Examples of knots}
\end{figure}
\end{document}
答案1
正如评论中提到的,您的代码有几个错误:没有文档类、额外的\end{figure}
、滥用let
PGF 语法以及未能包含calc
所需的库。(您包括了几件事不是需要编译您的示例,但省略了几个需要的。)
话虽如此,一旦这些错误被修复,这两个数字看起来大小似乎也差不多。事实上,它们看起来一模一样。
我最好的猜测是,尽管出现了错误,并且出现了可预见的不良结果,您仍会继续编译。即使是警告也不应该被忽略。错误需要修复。TeX 会告诉您事情出了问题,它不知道该怎么做。通常,如果您坚持,它会尝试做某事,但这并不是为了产生预期的输出。它的目的是可能为调试目的提供有用的信息。
\documentclass{article}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{tikz}
\usetikzlibrary{knots,calc}
\begin{document}
\begin{figure}
\begin{subfigure}[b]{0.45\textwidth}
\centering
\resizebox{\linewidth}{!}{
\begin{tikzpicture}
\foreach \brk in {0,1,2} {
\begin{scope}[rotate=\brk * 120]
\node[knot crossing, transform shape,
inner sep=1.5pt] (k\brk) at (0,-1) {};
\end{scope}
}
\foreach \brk in {0,1,2} {
\pgfmathparse{int(Mod(\brk - 1,3))}
\edef\brl{\pgfmathresult}
\draw[thick,red] (k\brk) .. controls (
k\brk.4 north west) and (k\brl.4 north east) .. (k\brl.center);
\draw[thick,red] (k\brk.center) .. controls (k\brk.16 south west) and (k\brl.16 south east) .. (k\brl);
}
\end{tikzpicture}
}
\caption{Trefoil}
\label{a}
\end{subfigure}
\begin{subfigure}[b]{0.45\textwidth}
\centering
\resizebox{\linewidth}{!}{
\begin{tikzpicture}
\def\foil{3}
\foreach \brk in {1,...,\foil} {
\begin{scope}[rotate=\brk * 360/\foil]
\node[transform shape, knot crossing, inner sep=1.5pt] (k\brk) at (0,-1) {};
\end{scope}
}
\draw[thick,red] (0,0) \foreach \brk in {1,...,\foil} {let \n0=\brk, \n1={int(Mod(\brk,\foil)+1)}, \n2={int(Mod(\brk+1,\foil)+1)} in (k\n0) .. controls (k\n0.16 south east) and (k\n1.16 south west) .. (k\n1.center) .. controls (k\n1.4 north east) and (k\n2.4 north west) .. (k\n2)};
\end{tikzpicture}
}
\caption{Cinquefoil}
\label{b}
\end{subfigure}
\caption{Examples of knots}
\end{figure}
\end{document}