Claim: ⚠这是一个相当邪修的做法...

我不太确定这是否会造成其他恶劣影响，建议不要使用。

来自我的这个提问。

\documentclass{article}
\usepackage[fontset=fandol]{ctex}
\usepackage{amsmath,amsfonts}
% https://ask.latexstudio.net/ask/question/17856.html
\begin{document}

    电磁学与电动力学的区别：
    \makeatletter
    \[
    \def\env@cases{%
      \let\@ifnextchar\new@ifnextchar
      \left\lbrace
      \def\arraystretch{0.5}%
      \array{@{}l@{\quad}l@{}}%
    }
    \makeatother
    \begin{cases}
        \text{电磁学：数学语言比较简单，通常只利用积分} 
        \vspace{10ex}\\
        \text{电动力学：大量使用矢量微分运算}
    \end{cases}
    \]

    \[
    y = \begin{cases}
        x+y+z \\
        x^2+y^2+z^2 
    \end{cases}
    \]
\end{document}

Notes: 永远不要在LaTeX里用$$...$$，使用\[...\]。详见这里。

Claim:以下只记录我的尝试过程，仅供参考

Step1

Step2

Step3

(这里我不太确定要不要重启，可以试试...)

Step4

\documentclass{standalone}
\usepackage[3d]{luadraw}
\usepackage[svgnames]{xcolor}
\begin{document}

    \pgfdeclareradialshading[]{sphereDay}{\pgfpoint{20 bp}{0 bp}}
    {color(0bp)=(orange!10); color(20bp)=(orange!50); color(38bp)=(orange)}% 
    \pgfdeclareradialshading[]{sphereNight}{\pgfpoint{50 bp}{0 bp}}
    {color(0bp)=(DarkBlue!10); color(15bp)=(DarkBlue!70); color(38bp)=(black)}% 

    \begin{luadraw}{name=earth_light_half}
        local g = graph3d:new{
            window3d={-5, 5, -5, 5, -5, 5},
            window={-5 , 10, -5 ,5},
            size={8, 8},viewdir={90, 80}
        }

        require "luadraw_spherical"
        local O, R = Origin, 4
        Hiddenlines = true
        Hiddenlinestyle = "dashed"
        g:Define_sphere({radius=R, show=false})
        local thetaA, thetaB = 22.5, 67.5
        -- plot the latitudes
        for _,i in ipairs({90-thetaA, 90-thetaB, 90+thetaA, 90+thetaB})do
            local lat = sM(0,i)
            g:DScircle({lat,vecK}, {color="magenta", width=4})
        end
        -- plot the equator
        g:DSbigcircle({vecI,vecJ},{style="dashed", color="teal", width=5})
        -- plot the axis
        g:DSseg({ M(0,0,-1.25*R), M(0,0,1.25*R) }, {width=10})
        -- two hemispheres outlines
        local A, B = Z(0,R), Z(0,-R)
        g:Dpath({ B, "m", 0, A, R, -1, "ca"}, "color=DarkGray, shading=sphereNight")
        g:Dpath({ B, "m", 0, A, R, 1, "ca"}, "color=DarkGray, shading=sphereDay")

        g:Rotate3d(-22.5, {Origin,vecJ})
        g:Dspherical()

        local dt = 25*deg
        for k = 0, 4 do
            local z = Zp(R+1,(k-2)*dt)
            g:Dpolyline({Z(10,z.im), z}, false, "-latex,thick,teal")
        end
        g:Show()
    \end{luadraw}
\end{document}

术业有专攻，应该找找建筑设计行业的「最佳实践」。

试了一下现有的宏包, 都相去甚远, 有没有什么好的宏包推荐一下呢?

从代码的注释里我只看到了纯AI的痕迹，没看到太多尝试。而且这个图从构图来看并不存在很大的技术难点，只是细节多，绘制繁琐。

说实话用TikZ画这种图的意义几乎为零。

其实我感觉语法没有比tikz-3d简单，反而求两个大圆交点(在luadraw-v2.6)需要花点心思...

% https://github.com/pfradin/luadraw/discussions/223#discussioncomment-16064759
\documentclass{standalone}
\usepackage[3d]{luadraw}
\usepackage[svgnames]{xcolor}
\usepackage{fourier}
\begin{document}
    \begin{luadraw}{name=spherical_geometry}
    local g = graph3d:new{window3d={-5, 5, -5, 5, -5, 5},window={-3,4.25,-3,4}, viewdir={30, 65}, size={12, 12}}
    require 'luadraw_spherical'

    local O,R = Origin,4
    g:Define_sphere({radius=R, show=false, opacity=1})
    local Pz, Px, Py = sM(0,0), sM(0,90), sM(90,90)
    local theta = 55
    local A, B = sM(theta, 90), Py
    local D = sM(90,65)
    local M = 0.7 * D
    local N = pxy(M)

    -- calculus of C and K
    -- The function plane(A,B,C) returns the plane passing through the three 3d points A, B, and C (if they are not aligned,otherwise the result is nil).
    local d = interPP( plane(O,Px,D), plane(O,A,Pz) )
    -- the intersection of two planes is line OC
    -- d[2] is a direction vector of the line d
    -- where d is the line in form {A,u}, the normalized direction vector
    local C = R*pt3d.normalize(d[2]) 
    local K = pxy(C) -- projection of C on the plane Oxy

    Hiddenlines = true;Hiddenlinestyle = "dashed"
    g:Linestyle("dashed")

    -- g:DSarc({Pz, Px}, 1)
    -- g:DSarc({Pz, Py}, 1)
    -- g:DSarc({Px, Py}, 1)
    -- g:DSarc({Px, D}, 1)
    -- g:DSarc({Pz, A}, 1)
    for _, arc in ipairs({{Pz, Px}, {Pz, Py}, {Px, Py}, {Px, D}, {Pz, A}}) do
        g:DSarc(arc, 1)
    end

    -- g:DSseg({O, Pz})    
    -- g:DSseg({O, Px})
    -- g:DSseg({O, Py})
    -- g:DSseg({N, K})
    -- g:DSseg({M, N})

    g:DSpolyline({{Px,O,Pz},{M,N,K},{O,B}})

    g:Linestyle("solid"); Hiddenlinestyle = "solid"
    g:DSseg({O, A})    
    g:DSseg({O, D})
    g:DSseg({O, C})
    g:DSseg({C, K})
    g:DSseg({C, M})
    g:DSarc({A, B}, 1)

    g:DSdots({O,A,D,M,N},{mark_options="teal"}) 
    g:DSstars({Pz, Px, Py}, {color="magenta",fill="magenta", scale=0.75}) 
    g:Dspherical()

    g:Dlabel3d(
        "$O$", O, {pos="W"}, 
        "$A$", A, {pos="S"}, 
        "$B$", B, {pos="E"}, 
        "$C$", C, {pos="NW"}, 
        "$D$", D, {pos="NE"}, 
        "$K$", K, {pos="W"}, 
        "$M$", M, {pos="N"}, 
        "$N$", N, {pos="NE"}
    )
    g:Show()
    \end{luadraw}
\end{document}

这个模板只有一些文件名不匹配的小问题，自行修改即可。

https://github.com/fylimas/nsfc/issues/73

也许是精度误差(?)

\documentclass[tikz]{standalone}
\begin{document}
    \begin{tikzpicture}
        \node {\fpeval{tand(45)} v.s. \pgfmathparse{tan(45)}\pgfmathresult};
    \end{tikzpicture}
\end{document}        

By @u115385

• https://mp.weixin.qq.com/s/cJUOepb3A-2e2wIL_gPH4w
• https://mp.weixin.qq.com/s/_QOs_Uqb9U_6yXpnGdme0w
• https://mp.weixin.qq.com/s/vJ2I6t7kGt4OHG1nfQ5U0w
• https://mp.weixin.qq.com/s/lgYl2D8X_DxDnEQRgRW1Nw
• https://mp.weixin.qq.com/s/zL1O9aj8HyyBknpq2N6l5g
• https://mp.weixin.qq.com/s/MXzWZjPrhTwYx85yD3HEDQ
• https://mp.weixin.qq.com/s/pQgbjlqTRRzKxdGtFH2OgQ
• https://mp.weixin.qq.com/s/WjlmVK5uaQ3FKJfwkX1vyg
• https://mp.weixin.qq.com/s/Gh2BAzfa90VlsqN2JI7HNw
• https://mp.weixin.qq.com/s/shHMw17-IXxbsjhXvpoe6w
• https://mp.weixin.qq.com/s/XtqSJh3oLxfFjFp76kBUpQ
• https://mp.weixin.qq.com/s/S4LoAUkeGTHjKIhPBTzOtw
• https://mp.weixin.qq.com/s/_Kk6w9jgP6ubM7spUy6itg
• https://mp.weixin.qq.com/s/1zUbW8ZGQOQvum72il_0tg
• https://mp.weixin.qq.com/s/eNVgfPYmyo4aFDDbS-xdew
• https://mp.weixin.qq.com/s/Dcd5u77OmUWEX8PyB9ltpA
• https://mp.weixin.qq.com/s/wk0NGWDux8ecoLuSPxJMRw
• https://mp.weixin.qq.com/s/CSkh8qzAF7n5OjF28fhTmg
• https://mp.weixin.qq.com/s/PPUMF43HB7GEI1QKdVo-_A
• https://mp.weixin.qq.com/s/cjLZLAo2n0L9lIzShkGHYg
• 合集：https://mp.weixin.qq.com/s/2OjV27AQhQ4__RfyJLcKVQ
• 3d：https://mp.weixin.qq.com/s/a3Mg0L-n95ymAyuOHkicWQ
• 流程图：https://mp.weixin.qq.com/s/ydTVyygOiWX1Mhvm03qHAA
• 绝对位置：https://mp.weixin.qq.com/s/EACqvfYyY4GNqujTfqJ1CQ
• beamer：https://mp.weixin.qq.com/s/xkoroBmEYpLgJvtZtU_IPA

希望在书签里能显示出subsubsection

默认情况下就能显示出subsubsection...请展示你「不能体现出subsubsection书签」的具体截图。

\documentclass[fontset=fandol]{ctexart}
\usepackage{hyperref}
\begin{document}
\section{单词}
\subsection{词汇}
\subsubsection{二级词汇}
\end{document}

并且把\words{...}中的单词放入书签显示，与subsection或subsubsection同一层次.

我没有这个字体，字体问题显然与是不是在书签显示，是不是同一层次无关。

加上hyperref提供的\pdfbookmark命令即可。其中level的含义是自解释的。

\documentclass[fontset=fandol]{ctexart}
\usepackage{hyperref}
\usepackage{xcolor}
\newcommand{\words}[1]{\pdfbookmark[2]{#1}{word:#1}\noindent{\huge\textbf{\textcolor{red}{#1}}~~}} 
% \newcommand{\words}[1]{\pdfbookmark[2]{#1}{work:#1}\noindent{\huge\textbf{\textcolor{red}{\fontspec{Avenir}#1}}~~}} 
\begin{document}
\section{单词}
\subsection{词汇}
\subsubsection{二级词汇}
\words{chenchen}
\words{辰辰}
\words{你好}
\end{document}

另外，我不觉得单词应该与\subsection或者\subsubsection同level.

与原文的最大差异是12pt的字体相对于版面太大了，改用默认的10pt并微调\item[]的定义即可：

\algnewcommand\algorithmicinput{\textbf{Input:}}
\algnewcommand\Input[1]{\item[\,\algorithmicinput]\ #1}
\algnewcommand\algorithmicoutput{\noindent\textbf{Output:}}
\algnewcommand\Output[1]{\item[\,\algorithmicoutput]\ #1}

完整代码：

\documentclass[a4paper]{article}
\usepackage[margin=1cm]{geometry}
\usepackage{libertine}
\usepackage[libertine]{newtxmath}
\usepackage{lipsum}
\usepackage{xcolor}
\usepackage{algorithm}
\usepackage{algpseudocode}
\algnewcommand\algorithmicinput{\textbf{Input:}}
\algnewcommand\Input[1]{\item[\,\algorithmicinput]\ #1}
\algnewcommand\algorithmicoutput{\noindent\textbf{Output:}}
\algnewcommand\Output[1]{\item[\,\algorithmicoutput]\ #1}
\pagestyle{empty}
\begin{document}
\lipsum[1]

\medskip
\noindent\begin{minipage}{.49\textwidth}%
    \begin{algorithm}[H]
        \centering
        \caption{SSM(S4)}
        \begin{algorithmic}[1]
            \Input{$x:(B,L,D)$}
            \Output{$y:(B,L,D)$}
            \State $A:(D,N) \leftarrow \text{Parameter}$ \par \Comment{$\text {Represents structured}\ \ N \times N\ \ \text{martix}$}
            \State $B:(D,N) \leftarrow \text{Parameter}$ 
            \State $C:(D,N) \leftarrow \text{Parameter}$
            \State $\Delta:(D) \leftarrow \tau_\Delta(\text{Parameter})$
            \State $\bar{A},\bar{B}:(D,N) \leftarrow \text{discretize}(\Delta,A,B)$
            \State $y \leftarrow \text{SSM}(\bar{A},\bar{B},C)(x)$ \par
            \Comment{Time-invariant: recurrence or convolution}
            \State \textbf{return} y
        \end{algorithmic}
    \end{algorithm}%
\end{minipage}\hfill%
\begin{minipage}{.49\textwidth}%
    \begin{algorithm}[H]%
        \centering
        \caption{SSM+Selection(S6)}
        \begin{algorithmic}[1]
            \Input{$x:(B,L,D)}$
            \Output{$y:(B,L,D)$}
            \State $A:(D,N) \leftarrow \text{Parameter}$ \par \Comment{$\text{Represents structured}\ \ N \times N\ \ \text{martix}$}
            \State $B:\textcolor{red!90!black}{(B,L,N)} \leftarrow \textcolor{red!90!black}{s_B(x)}$ 
            \State $C:\textcolor{red!90!black}{(B,L,N)} \leftarrow \textcolor{red!90!black}{s_C(x)}$
            \State $\Delta:\textcolor{red!90!black}{(B,L,D)} \leftarrow \tau_\Delta(\text{Parameter}+\textcolor{red!90!black}{s_\Delta(x)})$
            \State $\bar{A},\bar{B}:(B,L,D,N) \leftarrow \text{discretize}(\Delta,A,B)$
            \State $y \leftarrow \text{SSM}(\bar{A},\bar{B},C)(x)$ \par
            \Comment{\textcolor{red!90!black}{Time-varying}: recurrence (\textcolor{red!90!black}{scan}) only}
            \State \textbf{return} y
        \end{algorithmic}
    \end{algorithm}
\end{minipage}%
\medskip

\lipsum[2]
\end{document}

基于schemata宏包不做任何微调的话：

\documentclass[border=5pt]{standalone}
\usepackage[fontset=fandol]{ctex}
\usepackage{schemata}
\begin{document}
\schema
{
    \schemabox{1 一级标题}
}
{ 
    \schema
    {
        \schemabox{1.1 二级标题} 
    }
    {
        \schema
        {
            \schemabox{1.1.1 三级标题}
        }
        {
            \schemabox{1.1.1.1 四级标题}
            \schemabox{1.1.1.2 四级标题}
        }
        \schema
        {
            \schemabox{1.1.2 三级标题}
        }
        {
            \schemabox{1.1.2.1 四级标题}
            \schemabox{1.1.2.2 四级标题}
        }
    }
    \schema
    {
        \schemabox{1.2 二级标题} 
    }
    {
        \schema
        {
            \schemabox{1.1.1 三级标题}
        }
        {
            \schemabox{1.1.1.1 四级标题}
            \schemabox{1.1.1.2 四级标题}
        }
        \schema
        {
            \schemabox{1.1.2 三级标题}
        }
        {
            \schemabox{1.1.2.1 四级标题}\smallskip
            \schemabox{\parbox{8em}{\linespread{1.0}\selectfont 文字文字文字文字文字文字文字文字文字文字文字文字}}
        }
    }
}
\end{document}

Edit微调

修改\Schema[⟨type⟩]{⟨adjust⟩}{⟨size⟩}调整brace的位置：

\documentclass[border=5pt]{standalone}
\usepackage[fontset=fandol]{ctex}
\usepackage{schemata}
\begin{document}
\Schema{-2ex}{8ex}
{
    \schemabox{1 一级标题}
}
{ 
    \Schema{0ex}{4.5ex}
    {
        \schemabox{1.1 二级标题} 
    }
    {
        \schema
        {
            \schemabox{1.1.1 三级标题}
        }
        {
            \schemabox{1.1.1.1 四级标题}
            \schemabox{1.1.1.2 四级标题}
        }
        \schema
        {
            \schemabox{1.1.2 三级标题}
        }
        {
            \schemabox{1.1.2.1 四级标题}
            \schemabox{1.1.2.2 四级标题}
        }
    }
    \Schema{-1.5ex}{5.5ex}
    {
        \schemabox{1.2 二级标题} 
    }
    {
        \schema
        {
            \schemabox{1.1.1 三级标题}
        }
        {
            \schemabox{1.1.1.1 四级标题}
            \schemabox{1.1.1.2 四级标题}
        }
        \schema
        {
            \schemabox{1.1.2 三级标题}
        }
        {
            \schemabox{1.1.2.1 四级标题}\smallskip
            \schemabox{\parbox{8em}{\linespread{1.1}\selectfont 文字文字文字文字文字文字文字文字文字文字文字文字}}
        }
    }
}
\end{document}

(OS.其实我感觉这个语法也并不优雅...不如forest...难用，不够自动化...)

可以试试这个...手动计算一下...不过是不是「最佳实践」呢🤔

\documentclass[border=5pt]{standalone}
\usepackage[fontset=fandol]{ctex}
\usepackage[edges]{forest}
\usetikzlibrary{decorations.pathreplacing}

\begin{document}
\begin{forest}
    for tree={
        grow'=east,
        anchor=west,
        inner sep=0pt,
        outer sep=0pt,
        fit=band,
        align=left,
        if n=1{edge path'={(!ul.south west)-- (!u1.north west)}}{no edge},
        edge={decorate, decoration={brace,amplitude=1.5mm,raise=2mm}},
    },
    before drawing tree={
        for tree={
            if n children=0{}{
                y/.pgfmath={(y("!1")+max_y("!1")+y("!l")+min_y("!l"))/2}
            }
        }
    }
    [1 一级标题
        [1.1 二级标题
            [1.1.1 三级标题
                [1.1.1.1 四级标题]
                [1.1.1.2 四级标题]
                [1.1.1.3 四级标题]
            ]
            [1.1.2 三级标题
                [1.1.2.1 四级标题]
                [1.1.2.2 四级标题]
                [1.1.2.3 四级标题[\parbox{5em}{文字文字文字文字文字文字文字文字文字文字文字文字}]]
                [1.1.2.4 四级标题]
            ]
        ]
        [1.2 二级标题
            [1.2.1 三级标题
                [1.2.1.1 四级标题]
                [1.2.1.2 四级标题]
            ]
            [1.2.2 三级标题
                [1.2.2.1 四级标题]
                [\parbox{8em}{文字文字文字文字文字文字文字文字文字文字文字文字}]
            ]
        ]
    ]
\end{forest}

\end{document}

Related:

• https://tex.stackexchange.com/questions/44673/sieve-of-eratosthenes-in-tikz
• https://tex.stackexchange.com/questions/758314/primes-in-latex
• https://tex.stackexchange.com/questions/134305/how-to-produce-a-list-of-prime-numbers-in-latex

拒绝重复造轮子😡

基于tabularray的一个自动化方案...

\documentclass{article}
\usepackage{fourier}
\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{functional}
\IgnoreSpacesOn
\prgNewFunction \makeHundredCells { } {
  \tlSet \lTmpaTl { } 
  \intStepOneInline {1} {100} {
    \intCaseF { ##1 } {
        { 2 } {  }
        { 3 } {  }
        { 5 } {  }
        { 7 } {  }
    } {
        \intCompareTF { \intMathMod{##1}{2}  } = { 0 } {
          \tlPutRight \lTmpaTl { \SetCell{bg=magenta!50} } 
        }{
            \intCompareTF { \intMathMod{##1}{3} } = { 0 } {
              \tlPutRight \lTmpaTl { \SetCell{bg=cyan!50} } 
            }
            {
                \intCompareTF { \intMathMod{##1}{5} } = { 0 } {
                  \tlPutRight \lTmpaTl { \SetCell{bg=violet!50} } 
                }
                {
                    \intCompareT { \intMathMod{##1}{7} } = { 0 } {
                      \tlPutRight \lTmpaTl { \SetCell{bg=orange!50} } 
                    }
                }
            }
        }
      }
     \intCompareTF { ##1 } = { 1 } {
        \tlPutRight \lTmpaTl { } 
      }{
        \tlPutRight \lTmpaTl { ##1 }
      }
    \intCompareTF { \intMathMod{##1}{10} } = { 0 } {
      \tlPutRight \lTmpaTl { \\ } 
    }{
      \tlPutRight \lTmpaTl { & }
    }
  }
  \prgReturn { \expValue \lTmpaTl }
}
\IgnoreSpacesOff

\begin{document}

\begin{tblr}[evaluate=\makeHundredCells]{
        colspec = {*{10}{X[c]}},
        hlines, vlines,
        rows = {m, ht=3em},
    }
    \makeHundredCells 
\end{tblr}

\end{document}

或者等价的，用逻辑划分更清晰的evaluate = \makeTableBody和process = \myTblrProcessor分别控制内容和样式

\documentclass{article}
\usepackage{fourier}
\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{functional}
\IgnoreSpacesOn
\tlNew \lBodyTl
\tlNew \lCellValueTl
\prgNewFunction \makeTableBody { } {
  \tlClear \lBodyTl
  \intStepOneInline {1} {100} {
    \tlPutRight \lBodyTl { ##1 }
    \intCompareTF { \intMathMod{##1}{10} } = { 0 } {
      \tlPutRight \lBodyTl { \\ }
    }{
      \tlPutRight \lBodyTl { & }
    }
  }
  \prgReturn { \expValue \lBodyTl }
}
\prgNewFunction \myTblrProcessor { } {
  \intStepOneInline {1} {\arabic{rowcount}} {
    \intStepOneInline {1} {\arabic{colcount}} {
      \tlSet \lCellValueTl { \cellGetText {##1} {####1} }
        \intCompareT { \lCellValueTl } = { 1 } {
          \cellSetText {##1} {####1} { }
        }
        \intCaseF { \lCellValueTl } {
            { 2 } { } { 3 } { } { 5 } { } { 7 } { }
        } {
            \intCompareTF { \intMathMod{\lCellValueTl}{2} } = { 0 } {
              \cellSetStyle {##1} {####1} { bg=magenta!50 }
            }{
              \intCompareTF { \intMathMod{\lCellValueTl}{3} } = { 0 } {
                \cellSetStyle {##1} {####1} { bg=cyan!50 }
              }{
                \intCompareTF { \intMathMod{\lCellValueTl}{5} } = { 0 } {
                  \cellSetStyle {##1} {####1} { bg=violet!50 }
                }{
                  \intCompareT { \intMathMod{\lCellValueTl}{7} } = { 0 } {
                    \cellSetStyle {##1} {####1} { bg=orange!50 }
                  }
                }
              }
            }
        }
    }
  }
}
\IgnoreSpacesOff

\begin{document}

\begin{tblr}[
    evaluate = \makeTableBody
]{
  colspec = {*{10}{X[c]}},
  hlines, vlines,
  rows = {m, ht=3em},
  process = \myTblrProcessor
}
  \makeTableBody
\end{tblr}

\end{document}

问题0：

直接编译你的代码会得到一长串的警告：

Missing character: There is no T ("54) in font nullfont!
Missing character: There is no h ("68) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no m ("6D) in font nullfont!
Missing character: There is no 1 ("31) in font nullfont!
Missing character: There is no . ("2E) in font nullfont!
Missing character: There is no 0 ("30) in font nullfont!
Missing character: There is no . ("2E) in font nullfont!
Missing character: There is no 1 ("31) in font nullfont!
Missing character: There is no . ("2E) in font nullfont!
Missing character: There is no ( ("28) in font nullfont!
Missing character: There is no S ("53) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no m ("6D) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no d ("64) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no f ("66) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no t ("74) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no v ("76) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no s ("73) in font nullfont!
Missing character: There is no h ("68) in font nullfont!
Missing character: There is no i ("69) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no g ("67) in font nullfont!
Missing character: There is no t ("74) in font nullfont!
Missing character: There is no h ("68) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no m ("6D) in font nullfont!
Missing character: There is no f ("66) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no v ("76) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no c ("63) in font nullfont!
Missing character: There is no t ("74) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no b ("62) in font nullfont!
Missing character: There is no u ("75) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no d ("64) in font nullfont!
Missing character: There is no l ("6C) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no o ("6F) in font nullfont!
Missing character: There is no f ("66) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no k ("6B) in font nullfont!
Missing character: There is no ( ("28) in font nullfont!
Missing character: There is no G ("47) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no n ("6E) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no r ("72) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no l ("6C) in font nullfont!
Missing character: There is no C ("43) in font nullfont!
Missing character: There is no a ("61) in font nullfont!
Missing character: There is no s ("73) in font nullfont!
Missing character: There is no e ("65) in font nullfont!
Missing character: There is no ) ("29) in font nullfont!
Missing character: There is no ) ("29) in font nullfont!

这不是可忽视的警告！

出现问题的语句是要传给overlay unbroken中的\settowidth：

\newcommand{\my@lemma@overlay@unbroken}[2]{
   %%============== First ==============%%
   \def\rad{7pt}%
   \settowidth{\thmtcbtextlen}{\hspace*{10pt}#1.\ \ifdefvoid{\tcbtitletext}{}{(\itshape\tcbtitletext)}} %<-

这个问题的一个等价的MWE如下：

\documentclass{article}
\usepackage[most]{tcolorbox}
\newlength{\mylength}
\newcommand\mycmd[1]{%
    \settowidth{\mylength}{abcdefg}
    \node at (frame.south west) {\the\mylength};
    \draw[ultra thick,magenta] 
        (frame.north west) 
        -- 
        ([xshift=\mylength]frame.north west)
        node[right,font=\ttfamily] {#1:\the\mylength}
    ;
}
\begin{document}
\begin{tcolorbox}[
        title=A Simple Box,enhanced,
        overlay={\mycmd{A Simple Box}}
    ]
    This is a simple tcolorbox.
\end{tcolorbox}

\newlength{\anotherlength}
\settowidth{\anotherlength}{abcdefg}
\texttt{\the\anotherlength}

\end{document}

这个MWE编译会得到如下警告：

Missing character: There is no a in font nullfont!
Missing character: There is no b in font nullfont!
Missing character: There is no c in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no f in font nullfont!
Missing character: There is no g in font nullfont!

且对宽度的测量是不准确的。

该问题又可以进一步简化为「在tikz环境内不能直接使用\settowidth」:

\documentclass[tikz,border=5pt]{standalone}
\newlength{\mylength}
\begin{document}
\begin{tikzpicture}
    \settowidth{\mylength}{abcde}
    % \settowidth{\mylength}{\pgfinterruptpicture abcde\endpgfinterruptpicture}
    \draw (0,0) -- (\mylength,0) node[above right] {\the\mylength};
\end{tikzpicture}

\end{document}

会出现警告：

Missing character: There is no a in font nullfont!
Missing character: There is no b in font nullfont!
Missing character: There is no c in font nullfont!
Missing character: There is no d in font nullfont!
Missing character: There is no e in font nullfont!

解决方法和解释在这里。

不知道是不是：

我想要根据标题长度切换不同的装饰样式，目前无论长度如何都没法切换成功

的一个体现。