当节点有多行文本时突出显示 tikZ 矩阵中的特定节点（beamer）

Question

我有一张幻灯片，其中有一个节点矩阵，每次只显示一个节点。每个节点都有多行文本和数学运算（下面显示的示例代码删除了一些数学运算，以抽象出细节）。我希望在其中一个节点出现后突出显示它，方法是以某种方式自定义其外观（例如，更改框架颜色或背景颜色等）。具体来说，在下面的示例中，我想在第六张幻灯片之后更改最右下角节点（其中包含“stuff 4”的节点）的这些功能。

\documentclass{beamer}
\mode<presentation>
{
  \setbeamertemplate{navigation symbols}{}
  \setbeamertemplate{caption}[numbered]
}

\usepackage{tcolorbox}
\usepackage{tikz}
\usetikzlibrary{matrix,overlay-beamer-styles}

%%%%%%%%%
\usetikzlibrary{calc}
%%%%%%%%
\tcbuselibrary{theorems}


\newtcbtheorem[]{mylemmma}{Lemma}{colframe=green,colback=white, width=\textwidth}{lem}
\tcbset{colframe=green, colback=white}  
\resetcounteronoverlays{tcb@cnt@mylemmma}

\begin{document}
\section{Proofs}
\newtcbtheorem[]{mydef}{Problem Statement}{colframe=white, colback=white}{ps}
\tcbset{colframe=black, colback=white}              

\resetcounteronoverlays{tcb@cnt@mydef}
\begin{frame}[fragile]

\centering
\begin{tikzpicture}[optimization problem/.style = {%
            rounded corners, 
            draw = green,
            thick,
            fill = white,
            inner ysep = 5pt,
            inner xsep = 1pt,
            align = center},
            myplainbox/.style = {%
            rounded corners, 
            draw = green,
            thick,
            fill= white,
            inner ysep=5pt,
            inner xsep=1pt,
            align = center},
            ]

\matrix[matrix of nodes,row sep=1em,column sep=1.6em,
    nodes={anchor=west,
    visible on=<\the\numexpr\pgfmatrixcurrentcolumn+2*\pgfmatrixcurrentrow-2\relax->,},
    row 1/.style={nodes={optimization problem,
                 text width=12.8em, 
                 text depth = 3.5 em, 
                 text height = 1 em, 
    }}, 
    column 1/.style={nodes={myplainbox,
            text width=12.8em, 
%            text depth = 3.5 em, 
%            text height = 1 em, 
    }}, 
    column 2/.style={nodes={myplainbox,
            text width=12.8em, 
%            text depth = 3.5 em, 
%            text height = 1 em, 
    }}, 
    ](M){
     {some words here\\ $\scriptstyle f(x) - g(x)$ \\ $\scriptstyle \leq  p(x) + q(x) + r(x)$.} &    {some words here\\ $\scriptstyle f(x) - g(x)$ \\ $\scriptstyle \leq  p(x) + q(x) + r(x)$.}\\
     {stuff \\ more stuff} & {stuff 2 \\ more stuff 2}\\
     {stuff \\ more stuff} & {stuff 4 \\ more stuff 4}\\
};          

    \draw[->, thick, visible on = <2->] (M-1-1)--(M-1-2) node[midway, above] {\checkmark}; 
\end{tikzpicture}
\end{frame}
\end{document}

Answer 1

这很简单：向相应的矩阵元素添加一些本地键。如 pgfmanual v3.1.5 第 710 页所述，通过|[<style>]|向矩阵元素添加一些适当的样式，即可实现此目的。我刚刚添加了

|[alt=<7>{draw=red,thick,fill=red!20}{}]|

要得到

\documentclass{beamer}
\mode<presentation>
{
  \setbeamertemplate{navigation symbols}{}
  \setbeamertemplate{caption}[numbered]
}

\usepackage{tcolorbox}
\usepackage{tikz}
\usetikzlibrary{matrix,overlay-beamer-styles}

%%%%%%%%%
\usetikzlibrary{calc}
%%%%%%%%
\tcbuselibrary{theorems}


\newtcbtheorem[]{mylemmma}{Lemma}{colframe=green,colback=white, width=\textwidth}{lem}
\tcbset{colframe=green, colback=white}  
\resetcounteronoverlays{tcb@cnt@mylemmma}

\begin{document}
\section{Proofs}
\newtcbtheorem[]{mydef}{Problem Statement}{colframe=white, colback=white}{ps}
\tcbset{colframe=black, colback=white}              

\resetcounteronoverlays{tcb@cnt@mydef}
\begin{frame}[fragile]

\centering
\begin{tikzpicture}[optimization problem/.style = {%
            rounded corners, 
            draw = green,
            thick,
            fill = white,
            inner ysep = 5pt,
            inner xsep = 1pt,
            align = center},
            myplainbox/.style = {%
            rounded corners, 
            draw = green,
            thick,
            fill= white,
            inner ysep=5pt,
            inner xsep=1pt,
            align = center},
            ]

\matrix[matrix of nodes,row sep=1em,column sep=1.6em,
    nodes={anchor=west,
    visible on=<\the\numexpr\pgfmatrixcurrentcolumn+2*\pgfmatrixcurrentrow-2\relax->,},
    row 1/.style={nodes={optimization problem,
                 text width=12.8em, 
                 text depth = 3.5 em, 
                 text height = 1 em, 
    }}, 
    column 1/.style={nodes={myplainbox,
            text width=12.8em, 
%            text depth = 3.5 em, 
%            text height = 1 em, 
    }}, 
    column 2/.style={nodes={myplainbox,
            text width=12.8em, 
%            text depth = 3.5 em, 
%            text height = 1 em, 
    }}, 
    ](M){
     {some words here\\ $\scriptstyle f(x) - g(x)$ \\ $\scriptstyle \leq  p(x) + q(x) + r(x)$.} &    {some words here\\ $\scriptstyle f(x) - g(x)$ \\ $\scriptstyle \leq  p(x) + q(x) + r(x)$.}\\
     {stuff \\ more stuff} & {stuff 2 \\ more stuff 2}\\
     {stuff \\ more stuff} & |[alt=<7>{draw=red,thick,fill=red!20}{}]|{stuff 4 \\ more stuff 4}\\
};          

    \draw[->, thick, visible on = <2->] (M-1-1)--(M-1-2) node[midway, above] {\checkmark}; 
\end{tikzpicture}
\end{frame}
\end{document}