![从命令输入中打印数学打印值](https://linux22.com/image/464848/%E4%BB%8E%E5%91%BD%E4%BB%A4%E8%BE%93%E5%85%A5%E4%B8%AD%E6%89%93%E5%8D%B0%E6%95%B0%E5%AD%A6%E6%89%93%E5%8D%B0%E5%80%BC.png)
我正在尝试创建一个包含 2 个输入的新命令:半径和弧度。我已让所有命令正常工作,但当我编译时,弧度值打印出来为 2*pi/4(例如),而不是实际的 2 pi 符号除以 4。有办法解决这个问题吗?以下是新命令的代码;#1 = 半径和 #2=弧度
\newcommand{\arcR}[2]{
\begin{tikzpicture}[thick, font=\sffamily\Large,scale=0.5]
\draw (0,0) circle[radius=5];
\draw[very thick,fill=blue!30]
(0,0) -- ({deg(#2)}:5)
arc[start angle={deg(#2)}, end angle=0, radius=5] -- cycle;
\draw[latex-latex]
({deg(#2)}:1.2)
arc[start angle={deg(#2)}, end angle=0, radius=1.2]
node[above=5pt, midway] {$#2$};
\draw[very thick,-latex] (0,0) -- (0:5)
node[midway,below=2pt]{$#1$};
\end{tikzpicture}
}
\arcR{5}{2*pi/3}
将产生以下图像:
答案1
考虑@Qrrbrbirlbel 评论和库angles
和quotes
:
\documentclass[border=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{angles, arrows.meta,
quotes}
\ExplSyntaxOn
\DeclareDocumentCommand{\symbreplace}{m}{
\tl_set:Nx \l_tmpa_tl { #1 }
\regex_replace_case_all:nN {
{ pi }{ \c{pi} }
{ * }{ }
} \l_tmpa_tl
\tl_use:N \l_tmpa_tl
}
\ExplSyntaxOff
\newcommand\arcRQ[2]{
\draw (0,0) circle[radius=5];
\path[draw=blue, fill=blue!50, very thick, semitransparent]
(0,0) coordinate (c) -- (0:5) coordinate (a)
arc (0:deg(#1):#2cm) coordinate (b)
-- cycle;
\pic [ANG, "$\symbreplace{#1}$"] {angle = a--c--b};
}
\begin{document}
\begin{tikzpicture}[
> = Straight Barb,
ANG/.style = {draw, semithick, <->,
angle radius = 12mm,
angle eccentricity=1.3,
font=\Large\sffamily}
]
%%%%
\arcRQ{2*pi/3}{5}
\end{tikzpicture}
\end{document}
答案2
您可以使用包来解析数字l3regex
,也许(但我不确定这是否是最佳解决方案,因为这仅适用于特定语法,如以下代码中的注释所述):
\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\ExplSyntaxOn
% transforms any number of the form x, x*pi, pi/x or x*pi/y
% into properly styled math-mode
% where x and y can be any number, with or without decimal separator (dot)
\seq_new:N \l_topifrac_temp_seq
\NewDocumentCommand{\topifrac}{ m }{
\regex_extract_once:nnN { \A(\d*\.?\d+)?(\*?pi)?(/(\d*\.?\d+))?\Z }
{ #1 } \l_topifrac_temp_seq
\seq_item:Nn \l_topifrac_temp_seq { 2 }
\tl_if_blank:eTF { \seq_item:Nn \l_topifrac_temp_seq { 5 } }
{ \tl_if_blank:eTF { \seq_item:Nn \l_topifrac_temp_seq { 3 } }
{ }
{ \pi }
}
{ \frac{\pi}{ \seq_item:Nn \l_topifrac_temp_seq { 5 } } }
}
\ExplSyntaxOff
\newcommand{\arcR}[2]{
\begin{tikzpicture}[thick, font=\sffamily\Large, scale=0.5]
\draw (0,0) circle[radius=5];
\draw[very thick, fill=blue!30]
(0,0) -- ({deg(#2)}:5)
arc[start angle={deg(#2)}, end angle=0, radius=5] -- cycle;
\draw[latex-latex]
({deg(#2)}:1.2)
arc[start angle={deg(#2)}, end angle=0, radius=1.2]
node[above=5pt, midway] {$\topifrac{#2}$};
\draw[very thick, -latex] (0,0) -- (0:5)
node[midway, below=2pt]{$#1$};
\end{tikzpicture}
}
\begin{document}
\arcR{5}{2*pi/3}
\end{document}
答案3
一种方法是使用\arcR{5}{2\pi/3}
输入,然后当您需要进行计算时,您可以用\pi
替换*pi
。
代码:
\documentclass[border=2pt]{standalone}
\usepackage{tikz}
\usepackage{xstring}
\newcommand{\arcR}[2]{
\begin{tikzpicture}[thick, font=\sffamily\Large,scale=0.5]
\StrSubstitute{#2}{\pi}{*pi}[\RadianMeasure]% Replace '\pi' with '*pi'
\pgfmathsetmacro\DegreeMeasure{deg(\RadianMeasure)}%
%% -------------
\draw (0,0) circle[radius=5];
\draw[very thick,fill=blue!30]
(0,0) -- ({\DegreeMeasure}:5)
arc[start angle={\DegreeMeasure}, end angle=0, radius=5] -- cycle;
\draw[latex-latex]
({\DegreeMeasure}:1.2)
arc[start angle={\DegreeMeasure}, end angle=0, radius=1.2]
node[above=5pt, midway] {$#2$};
\draw[very thick,-latex] (0,0) -- (0:5)
node[midway,below=2pt]{$#1$};
\end{tikzpicture}
}
\begin{document}
\arcR{5}{2\pi/3}
\end{document}