我已遵循说明这里在水波槽末端创建一个造波器。代码如下：
\documentclass[a4paper, 12pt]{article}
\usepackage{tikz}
\usepackage{tikz-3dplot}
\usepackage{pgfplots}
\usepgflibrary{shapes.geometric}
\usetikzlibrary{calc}
\usepgfplotslibrary{patchplots}
\begin{document}
\begin{figure}
\centering
%\tdplotsetmaincoords{75}{-30}
\pgfplotsset{compat = newest}
\begin{tikzpicture}
[ axisstyle/.style={->,blue,thick},
tankedge/.style={thick,black},
fsedge/.style={thick,black},
fssurf/.style={red, opacity=.5},
bottomsurf/.style={gray, opacity=.05},
scale=2.5,
]
\pgfmathsetmacro{\Lx}{15}
\pgfmathsetmacro{\Ly}{1}
\pgfmathsetmacro{\h}{3}
\pgfmathsetmacro{\d}{1}
\begin{axis}[ ticks=none, axis lines = middle, axis line style=axisstyle,
xmin=-0.5,xmax={\Lx+1},
ymin=-0.5,ymax={\Ly+1},
zmin=-\h,zmax=\h,
%view={0}{0},
xlabel={$x$},ylabel={$y$},zlabel={$z$}]
\node at (axis cs:0,0,0) [anchor=east]{$O$};
\node at (axis cs:0,0,-\h) [anchor=east]{$z=-h$};
%draw MWL & bottom
\draw[tankedge] (0,0,0) -- ({\Lx},0,0) -- ({\Lx},{\Ly},0) -- (0,{\Ly},0) -- cycle;
\draw[tankedge] (0,0,{-\h}) -- ({\Lx},0,{-\h}) -- ({\Lx},{\Ly},{-\h}) -- (0,{\Ly},{-\h}) -- cycle;
\addplot3[patch,bottomsurf,patch type=rectangle,faceted color=black] coordinates{(0,0,-\h) (\Lx,0,-\h) (\Lx,\Ly,-\h) (0,\Ly,-\h)};
% Far end wall
\draw[tankedge] ({\Lx},0,0) -- ({\Lx},0,{-\h}) -- ({\Lx},{\Ly},{-\h}) -- ({\Lx},{\Ly},0) -- cycle;
% Wavemaker Paddle
\addplot3[surf,fssurf,domain=0:{\Ly},domain y={-\h+\d}:0,shader=flat] ({0.5*(1+y/(\h-\d))*cos(3*pi*x)},x,y);
\end{axis}
\end{tikzpicture}
\end{figure}
\end{document}
这个数字是这样的 -
我无法弄清楚，尽管代码中给出了表面\addplot3[surf,fssurf,domain=0:{\Ly},domain y={-\h+\d}:0,shader=flat] ({0.5*(1+y/(\h-\d))*cos(3*pi*x)},x,y);
图形表面的 x 坐标永不变为负值。
答案1
问题是 Ti钾Z/pgfplots 假设三角函数的参数以度为单位，除非另有说明。为了切换到弧度，您可以使用trig format plots=rad或将三角函数的参数包装到 中deg，等等。
从你的其它问题我认为您想在绘图中添加一些水波。这里有一种方法可以添加水波，即在造波器桨的位置，波浪跟随桨，而在远处，它们只是平行波。插值是用 完成的tanh。
\documentclass[tikz,border=3mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.17}
\begin{document}
\begin{tikzpicture}
[ axisstyle/.style={->,blue,thick},
tankedge/.style={thick,black},
fsedge/.style={thick,black},
fssurf/.style={red, opacity=.5},
bottomsurf/.style={gray, opacity=.05},
scale=2.5,
]
\pgfmathsetmacro{\Lx}{15}
\pgfmathsetmacro{\Ly}{1}
\pgfmathsetmacro{\h}{3}
\pgfmathsetmacro{\d}{1}
\pgfmathsetmacro{\Lcrit}{6}
\pgfmathsetmacro{\hw}{-0.4} % water level
\pgfmathsetmacro{\aw}{0.2} % amplitude of waves
\begin{axis}[ ticks=none, axis lines = middle, axis line style=axisstyle,
xmin=-0.5,xmax={\Lx+1},
ymin=-0.5,ymax={\Ly+1},
zmin=-\h,zmax=\h,
%view={0}{0},
xlabel={$x$},ylabel={$y$},zlabel={$z$},
declare function={f(\z,\y)=0.5*(1+\z/(\h-\d))*cos(deg(3*pi*\y));
g(\x,\y,\z)=0.5*(tanh(3*(\Lcrit-\x))+1)*f(\z,\y)+\x;
w(\x)=\aw*cos(deg(\x*pi));},
%trig format plots=rad,
]
\node at (0,0,0) [anchor=east]{$O$};
\node at (0,0,-\h) [anchor=east]{$z=-h$};
%draw MWL & bottom
\draw[tankedge] (0,0,0) -- ({\Lx},0,0) -- ({\Lx},{\Ly},0) -- (0,{\Ly},0) -- cycle;
\draw[tankedge] (0,0,{-\h}) -- ({\Lx},0,{-\h}) -- ({\Lx},{\Ly},{-\h}) -- (0,{\Ly},{-\h}) -- cycle;
\addplot3[patch,bottomsurf,patch type=rectangle,faceted color=black] coordinates{(0,0,-\h) (\Lx,0,-\h) (\Lx,\Ly,-\h) (0,\Ly,-\h)};
% Far end wall
\draw[tankedge] ({\Lx},0,0) -- ({\Lx},0,{-\h}) -- ({\Lx},{\Ly},{-\h}) -- ({\Lx},{\Ly},0) -- cycle;
% Wavemaker Paddle
\addplot3[surf,fssurf,domain y=0:{\Ly},domain={-\h+\d}:0,shader=flat]
({f(x,y)},y,x);
\addplot3[surf,shader=interp,opacity=0.8,
colormap={blueblack}{color=(blue) color=(blue!60)},
domain y=0:{\Ly},domain=0:\Lx,samples=51,samples y=51]
({g(x,y,\hw+\aw)},y,{\hw+w(x)});
\fill[blue,opacity=0.8] plot[variable=\x,domain=0:\Lx,samples=51]
({g(\x,0,\hw+\aw)},0,{\hw+w(\x)}) -- ({\Lx},0,-\h)--
(0,0,-\h) -- (0,0,-\h+\d) -- cycle
({g(\Lx,0,\hw+\aw)},0,{\hw+w(\Lx)}) --
({g(\Lx,\Ly,\hw+\aw)},\Ly,{\hw+w(\Lx)}) --(\Lx,\Ly,-\h)
--(\Lx,0,-\h) -- cycle;
\draw[tankedge,line cap=round] (0,0,0) -- ({\Lx},0,0)
edge ({\Lx},0,-\h) -- ({\Lx},{\Ly},0)
-- ({\Lx},{\Ly},-\h) -- ({\Lx},0,-\h) -- (0,0,-\h) -- cycle;
\end{axis}
\end{tikzpicture}
\end{document}
