我真的不知道问题出在哪里，但不知为何，这段代码只能工作一次。我把它放在一个活动文档中，它工作正常，但现在当我尝试第二次复制和粘贴它时，它不起作用——它与另一个工作正常的代码完全相同。我甚至创建了一个具有相同前言的新文件，但它不再起作用——这真的没有意义。这似乎完全是标记为“%angle”的部分的问题。这很令人沮丧，因为我的作业今天就要交了，而我真的很没时间。以下是我所拥有的：
\documentclass[11pt]{article}
\usepackage[margin=1in]{geometry}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[fleqn]{amsmath}
\usepackage{esint}
\usepackage[none]{hyphenat}
\usepackage{fancyhdr}
\usepackage{multicol}
\usepackage[pdftex]{graphicx}
\usepackage{caption}
\usepackage{lastpage}
\usepackage{array}
\usepackage{cellspace}
\usepackage{scrextend}
\usepackage{nicefrac}
\usepackage{tikz-cd}
\usepackage{mathtools}
\usepackage{enumitem}
\usepackage{tikz}
\usetikzlibrary{scopes}
\usepackage{verbatim}
\usepackage{textcomp}
\usepackage{gensymb}
\usepackage[autostyle]{csquotes}
\usepackage{relsize}
\usepackage{bigints}
\usepackage{tabularx}
\usepackage[margin=1.5cm]{caption}
\captionsetup[table]{labelfont={bf}}
\captionsetup[figure]{labelfont={bf}}
\setlength{\mathindent}{0.5in}
\pagestyle{fancy}
\lhead{}
\rhead{}
\chead{}
\cfoot{Page \thepage \hspace{1pt} of \pageref{LastPage}}
%\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
\newcommand\Mydiv[2]{%
\strut#1\kern.25em\smash{\raise.3ex\hbox{\big)}}\mkern-8mu
\overline{\enspace\strut#2}}
\makeatletter
\renewcommand*\env@matrix[1][c]{\hskip -\arraycolsep
\let\@ifnextchar\new@ifnextchar
\array{*\c@MaxMatrixCols #1}}
\makeatother
\parindent 0ex
\begin{document}
\renewcommand{\baselinestretch}{1.5}
\begin{tikzpicture}[
force/.style={>=latex,draw=black,fill=black},
axis/.style={densely dashed,gray,font=\small},
M/.style={rectangle,draw,fill=lightgray,minimum size=0.01cm,thin},
]
\matrix[column sep=2.5cm] {
&
% Free body diagram of M1
\begin{scope}[rotate=0]
\node[M,transform shape] (M) {};
% Draw axes and help lines
{[axis, -]
\draw (1.5,-1.5) -- (M)
{};
% angles
\draw[solid,shorten, >=0.5pt] (-45:\arcr)
arc(-45:-90:0.5cm);
\node at (0.28,-0.65) {$\alpha$};
}
% Forces
{[force,->, very thick]
\draw (M) -- ++ (-1.5, 1.5) node[above] {$\textbf{N}_1$};
\draw (M) -- ++ (1.5,1.5) node[above] {$\textbf{T}_1$};
\draw node[right] {$\hspace{0.05in}m_1$};
\draw (M) -- ++ (0,-1.5) node[below] {$\textbf{W}_1$};}
\end{scope}
&
% Free body diagram of M2
\begin{scope}[rotate=0]
\node[M,transform shape] (M) {};
% Draw axes and help lines
{[axis, -]
\draw (1.5,-1.5) -- (M)
{};
% angles
\draw[solid,shorten >=0.5pt] (-45:\arcr)
arc(-45:-90:0.5cm);
\node at (0.28,-0.65) {$\alpha$};
}
% Forces
{[force,->, very thick]
\draw (M) -- ++ (-1.5, 1.5) node[above] {$\textbf{N}_2$};
\draw (M) -- ++ (-1.5,-1.5) node[above left] {$\textbf{T}_2$};
\draw (M) -- ++ (1.5,1.5) node[above left] {\textbf{F}};
\draw node[right] {$\hspace{0.05in}m_2$};
\draw (M) -- ++ (0,-1.5) node[below] {$\textbf{W}_2$};}
\end{scope}
\\
};
\end{tikzpicture}
\end{document}
我得到的错误是“！包 pgf 错误：未知箭头类型‘0.5pt’。”等等。如果我删除绘制弧的部分，错误就会消失。我很感激任何帮助，但我真的不太了解 LaTeX。
编辑：通常情况下是这样的
答案1
这里有一个建议，可以减少角度的缺陷。使用angles为此而制作的库。我也会先绘制矢量，然后您可以使用它们来定义角度。
\documentclass[11pt]{article}
\usepackage[margin=1in]{geometry}
\usepackage{fancyhdr}
\usepackage[fleqn]{amsmath}
\usepackage{tikz}
\usetikzlibrary{angles,scopes,quotes}
\setlength{\mathindent}{0.5in}
\pagestyle{fancy}
\lhead{}
\rhead{}
\chead{}
\cfoot{Page \thepage \hspace{1pt} of \pageref{LastPage}}
%\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}
\newcommand\Mydiv[2]{%
\strut#1\kern.25em\smash{\raise.3ex\hbox{\big)}}\mkern-8mu
\overline{\enspace\strut#2}}
\makeatletter
\renewcommand*\env@matrix[1][c]{\hskip -\arraycolsep
\let\@ifnextchar\new@ifnextchar
\array{*\c@MaxMatrixCols #1}}
\makeatother
\parindent 0ex
\begin{document}
\renewcommand{\baselinestretch}{1.5}
\begin{figure}[htb]
\centering
\begin{tikzpicture}[
force/.style={>=latex,draw=black,fill=black},
axis/.style={densely dashed,gray,font=\small},
M/.style={rectangle,draw,fill=lightgray,minimum size=0.01cm,thin},
] \def\arcr{0.5cm}
\matrix[column sep=2.5cm] {
% Free body diagram of M1
\begin{scope}[rotate=0]
\node[M,transform shape] (M) {};
% Draw axes and help lines
% Forces
{[force,->, very thick]
\draw (M) -- ++ (-1.5, 1.5) node[above] {$\mathbf{N}_1$};
\draw (M) -- ++ (1.5,1.5) node[above] {$\mathbf{T}_1$};
\draw node[right] {$\hspace{0.05in}m_1$};
\draw (M) -- ++ (0,-1.5) node[below] (W1) {$\mathbf{W}_1$};}
{[axis, -]
\draw (1.5,-1.5) coordinate (A) -- (M);
% angles
\pic [draw,solid,->,angle radius=0.5cm,"$\alpha$",
angle eccentricity=1.5] {angle = W1--M--A};
}
\end{scope}
&
% Free body diagram of M2
\begin{scope}[rotate=0]
\node[M,transform shape] (M) {};
% Forces
{[force,->, very thick]
\draw (M) -- ++ (-1.5, 1.5) node[above] {$\mathbf{N}_2$};
\draw (M) -- ++ (-1.5,-1.5) node[above left] {$\mathbf{T}_2$};
\draw (M) -- ++ (1.5,1.5) node[above left] {$\mathbf{F}$};
\draw node[right=0.05in] {$m_2$};
\draw (M) -- ++ (0,-1.5) node[below] (W2) {$\mathbf{W}_2$};}
% Draw axes and help lines
{[axis, -]
\draw (1.5,-1.5) coordinate (A') -- (M);
\pic [draw,solid,->,angle radius=0.5cm,"$\alpha$",
angle eccentricity=1.5] {angle = W2--M--A};
}
\end{scope}
\\
};
\end{tikzpicture}
\caption{Some forces.}
\end{figure}
\end{document}
我删除了与图片无关的样式。但是，如果您将此代码放入文档中，请确保使用以下方式加载此处使用的库：
\usetikzlibrary{angles,scopes,quotes}
还要注意，这\textbf不是为数学模式设计的，所以我将其更改为\mathbf（但我更喜欢\boldsymbol，但这是一个品味问题）。