将 3D 图旋转至自上而下的视图

Question

我有一个具有 2 个参数的函数，当以 3D 形式绘制时，它会以某种方式旋转，从而隐藏部分表面：

\begin{tikzpicture}[
declare function={
    func(\x, \y) = ((\x<10) * (\x/10) + (\x>=10)) *
    ((\y<=30) * (\y/30) + (\y>30) * (1- (\y-30)/((\y-30)+3)));
}
]
\begin{axis}[
colormap name=whitered,
axis z line=middle,
xmin=0, xmax=50, xlabel=$d$,
ymin=0, ymax=30, ylabel=$v$,
zmin=0, zmax=1.1, zlabel=$\overline{f}$
]
\addplot3[domain=0:50, y domain=0:30, samples=50, surf] {func(\x, \y)};
\end{axis}
\end{tikzpicture}

为了防止这种情况，我想从“自上而下”的视图绘制它，然后仅依靠颜色来指示函数的值。如何做到这一点？

Answer 1

该选项/pgfplots/view={azimuth}{elevation}将帮助您

\documentclass[border = 5pt]{standalone}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}[
  declare function={
    func(\x, \y) = ((\x<10) * (\x/10) + (\x>=10)) *
    ((\y<=30) * (\y/30) + (\y>30) * (1- (\y-30)/((\y-30)+3)));
  }
  ]
  \begin{axis}[
    view={-70}{50},
    %axis z line=middle,
    xmin=0, xmax=50, xlabel=$d$,
    ymin=0, ymax=30, ylabel=$v$,
    zmin=0, zmax=1.1, zlabel=$\overline{f}$,
    ]
    \addplot3[domain=0:50, y domain=0:30, samples=50, surf] {func(\x, \y)};
  \end{axis}
\end{tikzpicture}

\end{document}