后续行动在 LaTeX 中制作手动图片
如果我按如下方式修改它，我应该更改域吗？据我理解，这里没有提到域，因为没有内置函数，几乎没有，而是通过定义它们来呈现图片中的所有内容。
正是如此，我希望图片清晰可见。现在我想以这些方式更改图形，我想知道是否应该应用内置的 cos 函数？因为据我了解，标记的点和适应这些点的手动曲线。我可能也理解错了 :)
\begin{tikzpicture}[,scale=1.5,xscale=0.75]
% axes
\draw[-latex] (0,0) -- (2*pi+0.5,0) node[right] {$\theta$};
\draw[-latex] (0,-1.5) -- (0,1.5) node[left] {$Y$};
% auxiliary lines
\draw[teal,dashed] (0,1) -- (2*pi,1);
\draw[teal] (2*pi,-1.5) -- (2*pi,1.5);
\draw[latex-latex,teal] (pi,0) -- (pi,1) node[fill=white,midway] {\small amplitude};
\draw[latex-latex,teal] (0,-1.25) -- (2*pi,-1.25) node[fill=white,midway] {\small basic interval $2\pi$};
\draw[latex-latex,teal] (0,1.25) -- (2*pi,1.25) node[fill=white,midway,
yshift=1mm,text width=2cm,
align=center] {\small period}; %cycle wavelength;
% ticks
\foreach\i in {-1,0,+1}
\node[left] at (0,\i) {$\i$};
\node[below] at (0.5*pi,0) {$\frac{\pi}{2}$};
\node[below] at (pi,0) {$\pi$};
\node[below,xshift=1mm] at (1.5*pi,0) {$\frac{3\pi}{2}$};
\node[below,fill=white] at (2*pi,0) {$2\pi$};
% cos
\draw[black,thick] (0,1) cos (0.5*pi,0) sin (pi,-1) cos (1.5*pi,0) sin (2*pi,1);
\end{tikzpicture}
答案1
现在我知道你需要什么了。你知道，有时候一张照片很有价值……如果我们需要一张照片，那显然就值很多钱 XD。
我给你两个选择：
- 如果你想要类似链接答案的东西，你可以使用
shift函数（你还需要一个sin）并将clip其到域[0,2π]：
\clip (0,-1.5) rectangle (2*pi,1.5);
\draw[black,thick,shift={(pi/6,0)}] (-0.25*pi,0) sin (0,1) cos (0.25*pi,0) ...
- 或者，您可以使用
plot适当的功能：
\draw[red,dashed,thick] plot[domain=0:2*pi,samples=81] (\x,{cos(deg(2*(\x-pi/6))});
我把两个选项重叠起来画出来，这样你就能看到它们给出相同的输出。选择你喜欢的就行。
完整示例：
\documentclass[tikz,border=1.618mm]{standalone}
\begin{document}
\begin{tikzpicture}[scale=1.5,xscale=0.75]
% axes
\draw[-latex] (0,0) -- (2*pi+0.5,0) node[right] {$\theta$};
\draw[-latex] (0,-1.5) -- (0,1.5) node[left] {$Y$};
% auxiliary lines
\draw[teal,dashed] (0,1) -- (2*pi,1);
\draw[teal] (2*pi,-1.5) -- (2*pi,1.5);
\draw[latex-latex,teal] (0.5*pi,0) -- (0.5*pi,1) node[fill=white,midway] {\small amplitude};
\draw[latex-latex,teal] (0,-1.25) -- (2*pi,-1.25) node[fill=white,midway] {\small basic interval $2\pi$};
\draw[latex-latex,teal] (pi,1.4) -- (2*pi,1.4) node[fill=white,midway,text width=2cm,align=center]
{\small wavelength period cycle};
% ticks
\foreach\i in {0.5,1,1.5}
\draw (\i*pi,0.05) -- (\i*pi,-0.05);
\foreach\i in {-1,0,+1}
\node[left] at (0,\i) {$\i$};
\node[below] at (0.5*pi,0) {$\frac{\pi}{2}$};
\node[below] at (pi,0) {$\pi$};
\node[below] at (1.5*pi,0) {$\frac{3\pi}{2}$};
\node[below,fill=white] at (2*pi,0) {$2\pi$};
% cos (two options, choose whatever you prefer)
\draw[black,thick] (0,1) cos (0.25*pi,0) sin (0.5*pi,-1) cos (0.75*pi,0) sin (pi,1)
cos (1.25*pi,0) sin (1.5*pi,-1) cos (1.75*pi,0) sin (2*pi,1);
\draw[red,dashed,thick] plot[domain=0:2*pi,samples=81] (\x,{cos(2*\x r)});
\end{tikzpicture}
\begin{tikzpicture}[scale=1.5,xscale=0.75]
% axes
\draw[-latex] (0,0) -- (2*pi+0.5,0) node[right] {$\theta$};
\draw[-latex] (0,-1.5) -- (0,1.5) node[left] {$Y$};
% auxiliary lines
\draw[teal,dashed] (0,1) -- (2*pi,1);
\draw[teal] (2*pi,-1.5) -- (2*pi,1.5);
\draw[latex-latex,teal] (2*pi/3,0) -- (2*pi/3,1) node[fill=white,midway] {\small amplitude};
\draw[latex-latex,teal] (0,-1.25) -- (2*pi,-1.25) node[fill=white,midway] {\small basic interval $2\pi$};
\draw[latex-latex,teal] (0,-0.75) -- (pi/6,-0.75) node[midway,below] {\small$\frac{\pi}{6}$};
\draw[teal,dashed] (pi/6,-1) -- (pi/6,1);
% ticks
\foreach\i in {0.5,1,1.5}
\draw (\i*pi,0.05) -- (\i*pi,-0.05);
\foreach\i in {-1,0,+1}
\node[left] at (0,\i) {$\i$};
\node[below] at (0.5*pi,0) {$\frac{\pi}{2}$};
\node[below] at (pi,0) {$\pi$};
\node[below] at (1.5*pi,0) {$\frac{3\pi}{2}$};
\node[below,fill=white] at (2*pi,0) {$2\pi$};
% cos (two options, choose whatever you prefer)
\clip (0,-1.5) rectangle (2*pi,1.5);
\draw[black,thick,shift={(pi/6,0)}] (-0.25*pi,0) sin (0,1) cos (0.25*pi,0) sin (0.5*pi,-1) cos (0.75*pi,0) sin (pi,1)
cos (1.25*pi,0) sin (1.5*pi,-1) cos (1.75*pi,0) sin (2*pi,1);
\draw[red,dashed,thick] plot[domain=0:2*pi,samples=81] (\x,{cos(deg(2*(\x-pi/6))});
\end{tikzpicture}
\end{document}
