我这个例子：
\documentclass[border=2mm]{standalone}
\usepackage {tikz}
\usepackage {siunitx}
\usetikzlibrary{3d}
\usetikzlibrary{babel}
\usetikzlibrary{calc}
% \usepackage{enumitem,setspace,kantlipsum}
% isometric
\pgfmathsetmacro\xx{1/sqrt(2)}
\pgfmathsetmacro\xy{1/sqrt(6)}
\pgfmathsetmacro\zy{sqrt(2/3)}
\begin{document}
\begin{tikzpicture}[x={(\xx cm,-\xy cm)},y={(\xx cm,\xy cm)},z={(0 cm,\zy cm)},% vectores i,j,k
thick,line cap=round,line join=round, scale=0.7]
\def\br{1.5}
\def\be{4}
\def\we{17.6}
\def\ws{4}
\fill[canvas is yz plane at x=-\ws,gray!30] (-1.2*\ws,0) rectangle (1.2*\ws,\we+1);
\fill[canvas is xy plane at z=0 ,gray!15] (-\ws,-1.2*\ws) rectangle (7,1.2*\ws);
\draw[dashed] (0,0,\be) -- (0,0,0) -- (\ws,0,0) node[midway,sloped, above, xshift=-0.65cm] {\SI{40}{cm}};
\fill[canvas is xy plane at z=0,gray!80] (\ws,0) circle (0.25) node[black,xshift=1.25cm] {}; %
\draw[canvas is xy plane at z=0,cyan, dashed] (\ws,0) circle (2.25) node[black,xshift=0.85cm, align=left] {Boxing\\ Zone};
\draw[fill= red!20] ($(-135:\br)+(0,0,\be+9.6)$) --++ (0,0,-9.6)
{[canvas is xy plane at z=\be] arc (-135:45:\br)} -- ($(45:\br)+(0,0,\be+9.6)$);
\draw[canvas is xy plane at z=\be+9.6,fill=red!40] (0,0) circle (\br);
\foreach[count=\xi]\i in{1.5,4.2,6.9}
{% 1.5, 1.5+2.7, 1.5+2.7+2.7
\begin{scope}[canvas is xy plane at z=\be+\i]
\draw[orange] (0,0) circle (\br);
\fill[orange] (0,0,\be+\i) circle (1pt);
\coordinate (C\xi) at (225:\br+0.2);
%--
\foreach \k in {0,120,240}
{%
\begin{scope}[rotate=\k]
\draw[gray,dashed] (0,0) -- (\br,0);
\draw[red, opacity=0.85, fill=blue!75,fill opacity=0.6,] (0.75,-0.12) rectangle (1.1,0.12);
\end{scope}
}
%--
\end{scope}
}
\foreach\i in {0,90,180,270}
{%
\draw[line width=0.5mm] ($(\i:\br)+(0,0,\be+9.6)$) -- (0,0,\we-0.15);
}
\draw[line width=0.5mm] (0,-\br,\be+9.6) --++ (0,0,-0.5);
\draw[line width=0.5mm] (\br, 0,\be+9.6) --++ (0,0,-0.5);
% Wall structure
\begin{scope}[shift={(-\ws,0,\we)},line width=1.5mm]
\draw (0.5*\ws ,0,0) -- (0,0,-0.5*\ws) -- (0,0,-\ws);
\draw (0,-0.5*\ws,0) -- (0,0.5*\ws,0);
\draw (0,0,0) -- (1.25*\ws,0,0);
\end{scope}
\end{tikzpicture}
\end{document}
我想更改绘制的部分的角度 \k：
%--
\foreach \k in {0,120,240}
{%
\begin{scope}[rotate=\k]
\draw[gray,dashed] (0,0) -- (\br,0);
\draw[red, opacity=0.85, fill=blue!75,fill opacity=0.6,] (0.75,-0.12) rectangle (1.1,0.12);
\end{scope}
}
%--
作为索引为 \i 的 foreach 函数（\foreach[count=\xi]\i in{1.5,4.2,6.9}）例如，如果 \i 的值为 1.5（列表的第一个值），则不执行任何操作，但如果值为 4.2 或 6.9，则角度 \k 给出的旋转应变为 60 度、180 度和 300 度。
答案1
简而言之：
\foreach [evaluate={\kk={ifthenelse(\i<4, \k, \k+60)}}] \k in {0,120,240}
{
\begin{scope}[rotate=\kk]
evaluate让您根据循环变量计算新值。因此，我在这里使用ifthenelse检查 的值\i，并将新变量设置\kk为\k或\k+60。
\documentclass[border=2mm]{standalone}
\usepackage {tikz}
\usepackage {siunitx}
\usetikzlibrary{3d}
\usetikzlibrary{babel}
\usetikzlibrary{calc}
% \usepackage{enumitem,setspace,kantlipsum}
% isometric
\pgfmathsetmacro\xx{1/sqrt(2)}
\pgfmathsetmacro\xy{1/sqrt(6)}
\pgfmathsetmacro\zy{sqrt(2/3)}
\begin{document}
\begin{tikzpicture}[x={(\xx cm,-\xy cm)},y={(\xx cm,\xy cm)},z={(0 cm,\zy cm)},% vectores i,j,k
thick,line cap=round,line join=round, scale=0.7]
\def\br{1.5}
\def\be{4}
\def\we{17.6}
\def\ws{4}
\fill[canvas is yz plane at x=-\ws,gray!30] (-1.2*\ws,0) rectangle (1.2*\ws,\we+1);
\fill[canvas is xy plane at z=0 ,gray!15] (-\ws,-1.2*\ws) rectangle (7,1.2*\ws);
\draw[dashed] (0,0,\be) -- (0,0,0) -- (\ws,0,0) node[midway,sloped, above, xshift=-0.65cm] {\SI{40}{cm}};
\fill[canvas is xy plane at z=0,gray!80] (\ws,0) circle (0.25) node[black,xshift=1.25cm] {}; %
\draw[canvas is xy plane at z=0,cyan, dashed] (\ws,0) circle (2.25) node[black,xshift=0.85cm, align=left] {Boxing\\ Zone};
\draw[fill= red!20] ($(-135:\br)+(0,0,\be+9.6)$) --++ (0,0,-9.6)
{[canvas is xy plane at z=\be] arc (-135:45:\br)} -- ($(45:\br)+(0,0,\be+9.6)$);
\draw[canvas is xy plane at z=\be+9.6,fill=red!40] (0,0) circle (\br);
\foreach[count=\xi]\i in{1.5,4.2,6.9}
{% 1.5, 1.5+2.7, 1.5+2.7+2.7
\begin{scope}[canvas is xy plane at z=\be+\i]
\draw[orange] (0,0) circle (\br);
\fill[orange] (0,0,\be+\i) circle (1pt);
\coordinate (C\xi) at (225:\br+0.2);
%--
\foreach [evaluate={\kk={ifthenelse(\i<4, \k, \k+60)}}] \k in {0,120,240}
{
\begin{scope}[rotate=\kk]
\draw[gray,dashed] (0,0) -- (\br,0);
\draw[red, opacity=0.85, fill=blue!75,fill opacity=0.6,] (0.75,-0.12) rectangle (1.1,0.12);
\end{scope}
}
%--
\end{scope}
}
\foreach\i in {0,90,180,270}
{%
\draw[line width=0.5mm] ($(\i:\br)+(0,0,\be+9.6)$) -- (0,0,\we-0.15);
}
\draw[line width=0.5mm] (0,-\br,\be+9.6) --++ (0,0,-0.5);
\draw[line width=0.5mm] (\br, 0,\be+9.6) --++ (0,0,-0.5);
% Wall structure
\begin{scope}[shift={(-\ws,0,\we)},line width=1.5mm]
\draw (0.5*\ws ,0,0) -- (0,0,-0.5*\ws) -- (0,0,-\ws);
\draw (0,-0.5*\ws,0) -- (0,0.5*\ws,0);
\draw (0,0,0) -- (1.25*\ws,0,0);
\end{scope}
\end{tikzpicture}
\end{document}