我想重新创造
这是我的 MWE：
\documentclass{standalone}
\usepackage{pgfplots}
\begin{document}
\begin{minipage}{.35\textwidth}
\begin{tikzpicture}[scale=0.5]
\begin{axis}[
xmin=-.1,xmax=1.1,ymin=-.1,ymax=1.1,
axis lines=center,
ticks=none,
unit vector ratio*=1 1 1,
xlabel=$u$, ylabel=$v$,
every axis y label/.style={at=(current axis.above origin),anchor=south},
every axis x label/.style={at=(current axis.right of origin),anchor=west},
]
\addplot [very thick, blue, smooth, domain=(-.2:.2+pi/2)] ({cos(deg(x))},{sin(deg(x))});
\addplot [black] plot coordinates {(0,0) (1,.839)}; %% 40 degrees
\addplot [very thick, blue] plot coordinates {(.766,0) (.766,.643)}; %% 40 degrees
\addplot [black] plot coordinates {(1,0) (1,.839)}; %% 40 degrees
\addplot [black,smooth, domain=(0:40)] ({.15*cos(x)},{.15*sin(x)});
\node at (axis cs:.15,.07) [anchor=west] {$x$};
\node at (axis cs:.766,.322) [anchor=east] {$\sin(x)$};
\node at (axis cs:.383,0) [anchor=north] {$\cos(x)$};
\end{axis}
\end{tikzpicture}
\end{minipage}
\begin{minipage}{.35\textwidth}
\begin{tikzpicture}[scale=0.5]
\begin{axis}[
xmin=-.1,xmax=1.1,ymin=-.1,ymax=1.1,
axis lines=center,
ticks=none,
unit vector ratio*=1 1 1,
xlabel=$u$, ylabel=$v$,
every axis y label/.style={at=(current axis.above origin),anchor=south},
every axis x label/.style={at=(current axis.right of origin),anchor=west},
]
\addplot [very thick, blue, smooth, domain=(-.2:.2+pi/2)] ({cos(deg(x))},{sin(deg(x))});
\addplot [black] plot coordinates {(0,0) (1,.839)}; %% 40 degrees
\addplot [black] plot coordinates {(.766,0) (.766,.643)}; %% 40 degrees
\addplot [black] plot coordinates {(1,0) (1,.839)}; %% 40 degrees
\addplot [black,smooth, domain=(0:40)] ({.15*cos(x)},{.15*sin(x)});
\addplot [very thick,blue] plot coordinates {(0,0) (.766,.643)}; %% sector
\addplot [very thick,blue] plot coordinates {(0,0) (1,0)}; %% sector
\addplot [very thick, blue, smooth, domain=(0:40)] ({cos(x)},{sin(x)}); %% sector
\node at (axis cs:.15,.07) [anchor=west] {$x$};
\node at (axis cs:.5,0) [anchor=north] {$1$};
\end{axis}
\end{tikzpicture}
\end{minipage}
\begin{minipage}{.35\textwidth}
\begin{tikzpicture}[scale=0.5]
\begin{axis}[clip=false,
xmin=-.1,xmax=1.1,ymin=-.1,ymax=1.1,
axis lines=middle,
xlabel=$u$, ylabel=$v$,
ticks=none,
unit vector ratio*=1 1 1,
every axis y label/.style={at=(current axis.above origin),anchor=south},
every axis x label/.style={at=(current axis.right of origin),anchor=west},
]
\addplot [very thick, blue, smooth, domain=(-.1:1.671)] ({cos(deg(x))},{sin(deg(x))});
\addplot [very thick, blue] plot coordinates {(0,0) (1,.839)}; %% 40 degrees
\addplot [black] plot coordinates {(.766,0) (.766,.643)}; %% 40 degrees
\addplot [very thick, blue] plot coordinates {(1,0) (1,.839)}; %% 40 degrees
\addplot [black,smooth, domain=(0:40)] ({.15*cos(x)},{.15*sin(x)});
\node at (axis cs:.15,.07) [anchor=west] {$x$};
\node at (axis cs:.5,0) [anchor=north] {$1$};
\node at (axis cs:1,.42) [anchor=west] {$\tan(x)$};
\end{axis}
\end{tikzpicture}
\end{minipage}
\end{document}
我的问题在于labels和shading。
答案1
除非您在每个图表中添加\captions ，否则我认为您不需要 s minipage。事实上，您可以使用单个tikzpicture。虽然可以使用三个axis环境（您可以使用 设置位置at={<coordinate>}），但库groupplot中的环境groupplots是为这种类型的东西而制作的。
它简化了代码，因为您只需设置一次轴的通用设置。我还定义了一些用于绘制、填充和节点的样式，并为角度定义了一个函数。A然后使用cos(A)//定义所有坐标，而不是您拥有的十进制值。这样，您也可以轻松更改角度 - 修改值，整个图表就会发生变化。sin(A)tan(A)A
顺便说一句，您的代码中有几个奇怪之处。记录的设置域的方法是使用domain=0:40，没有括号（即使它实际上可以使用它们）。而您使用的是\addplot plot coordinates，它将 TikZ 语法\draw plot coordinates与pgfplots语法混合在一起\addplot coordinates。plot这里不需要关键字。
\documentclass[border=5mm]{standalone}
\usepackage{pgfplots}
% with compat=1.11 or higher, you don't have to specify "axis cs:" for coordinates in e.g. \node
\pgfplotsset{compat=1.15}
\usepgfplotslibrary{groupplots}
\begin{document}
\begin{tikzpicture}[
% parameterise the angle
declare function={A=40;},
% for labels sin(x), cos(x), tan(x), 1
triglabels/.style={left,black,font=\footnotesize,inner sep=4pt},
% for outlines
blueline/.style={very thick, draw=blue},
% for filling
filling/.style={fill=blue!10},
% for Triangle A/B, Sector, below axes
caption/.style={below=2mm,font=\itshape}
]
\begin{groupplot}[
group style={
group size=3 by 1, % 3 columns in 1 row
horizontal sep=5mm,
group name=T % name used at the end
},
% the following settings apply to all three axes
xmin=-.1,xmax=1.1,
ymin=-.1,ymax=1.1,
axis lines=center,
ticks=none,
unit vector ratio*=1 1 1,
xlabel=$u$, ylabel=$v$,
every axis y label/.style={at=(current axis.above origin),anchor=south},
every axis x label/.style={at=(current axis.right of origin),anchor=west},
% set default domain
domain=-.1:.1+pi/2,
% set clip=false to avoid clipping of nodes
clip=false,
]
\nextgroupplot
% draw arc
\addplot [blueline] ({cos(deg(x))},{sin(deg(x))});
% draw tan(A) triangle
\addplot [black] coordinates {(0,0) (1,{tan(A)}) (1,0)};
% draw and fill triangle
\addplot [blueline,filling] coordinates {(0,0) ({cos(A)},0) ({cos(A)},{sin(A)}) (0,0)};
% add labels
\node [triglabels,below] at ({cos(A)/2},0) {$\cos(x)$};
\node [triglabels,left] at ({cos(A)},{sin(A)/2}) {$\sin(x)$};
% angle
\addplot [black,domain=0:A] ({.15*cos(x)},{.15*sin(x)})
node[triglabels,right,midway] {$x$};
\nextgroupplot
% draw arc
\addplot [blueline] ({cos(deg(x))},{sin(deg(x))});
\addplot [black] coordinates {(1,0) (1,{tan(A)}) (0,0)};
% do the filling in two steps, note \closedcycle
\addplot [filling] coordinates {(0,0) ({cos(A)},{sin(A)})} \closedcycle;
\addplot [filling,domain=0:A] ({cos(x)},{sin(x)}) \closedcycle;
% draw the two sector lines, add "1"label along the way
\addplot [blueline] coordinates {({cos(A)},{sin(A)}) (0,0) (1,0)}
node[triglabels,below,pos=0.75] {$1$};
% then draw the arc
\addplot [blueline,domain=0:A] ({cos(x)},{sin(x)});
% angle
\addplot [black,domain=0:A] ({.15*cos(x)},{.15*sin(x)})
node[triglabels,right,midway] {$x$};
\nextgroupplot
% draw and fill triangle
\addplot [blueline,filling] coordinates {(0,0) (1,0) (1,{tan(A)}) (0,0)};
% add labels
\node [triglabels,below] at (0.5,0) {$1$};
\node [triglabels,right] at (1,{tan(A)/2}) {$\tan(x)$};
% black line
\addplot [black] coordinates {({cos(A)},{sin(A)}) ({cos(A)},0)};
% draw arc on top of filling
\addplot [very thick, blue,] ({cos(deg(x))},{sin(deg(x))});
% angle
\addplot [black, domain=0:A] ({.15*cos(x)},{.15*sin(x)})
node[triglabels,right,midway] {$x$};
\end{groupplot}
% add labels below axes
\node [caption] at (T c1r1.outer south) {Triangle A};
\node [caption] at (T c2r1.outer south) {Sector};
\node [caption] at (T c3r1.outer south) {Triangle B};
\end{tikzpicture}
\end{document}