☰

beamercolorbox 的透明度及其文本的不透明度

tag-icon • tag-icon beamer transparency
beamercolorbox 的透明度及其文本的不透明度

这是一个后续问题如何制作部分透明的 beamercolorbox

问题是我想要一个透明的 beamercolorbox，但文本不透明。我该怎么办？我也不喜欢 beamercolorbox 顶部的深色线条。我也愿意接受其他可能性。以下是有问题的幻灯片的一个最小示例：

\documentclass[xcolor=usenames,dvipsnames]{beamer}

\colorlet{color1}{PineGreen}

 \mode<presentation>
{
\usetheme{default}
\usecolortheme{lily}
\usefonttheme{professionalfonts}
\setbeamercolor{alert}{fg=red!80!black}
\setbeamercolor{text1}{fg=color1!80!black}
\setbeamercolor{text2}{fg=black}
\setbeamercolor{structure}{fg=color1!80!black}
\setbeamercolor{frametitle}{fg=red!80!black}
\setbeamercolor{box1}{fg=black,bg=Dandelion}
\setbeamercolor{box2}{fg=black,bg=SeaGreen}
\setbeamercolor{box3}{fg=black,bg=Aquamarine}

\setbeamerfont{frametitle}{series=\bfseries}
\setbeamertemplate{frametitle}
{
  \begin{flushright}
    \insertframetitle\par
  \end{flushright}
}
\usebackgroundtemplate{\includegraphics[width=\paperwidth]{figures/PNG/ripple.png}}
\setbeamercovered{transparent}
\setbeamerfont{title}{size=\Large,series=\bfseries,shape=\itshape,family=  \rmfamily}
\setbeamercolor{title}{fg=red!80!black}
}

\usepackage[english]{babel}
\usepackage{aas_macros}
\usepackage[latin1]{inputenc}
\usepackage{times}
\usepackage[T1]{fontenc}


\begin{document}

\begin{frame}
\frametitle{slide title}
\pgfsetfillopacity{0.35}
\begin{columns}
\column{0.5\textwidth}
\pgfsetfillopacity{0.35}
  \begin{beamercolorbox}[shadow=false,rounded=true]{box2}
    {\usebeamercolor[fg]{text2} \bf T1}
    \begin{itemize}
    \item element
    \item element
    \item element
    \item element
    \item element
    \end{itemize}
  \end{beamercolorbox}
\column{0.5\textwidth}
  \begin{beamercolorbox}[shadow=false,rounded=true]{box3}
    {\usebeamercolor[fg]{text2} \bf T2}
    \begin{itemize}
    \item element
    \item element
    \item element
    \item element
    \end{itemize}
  \end{beamercolorbox}
\end{columns}  
\begin{beamercolorbox}[shadow=false,rounded=true]{box1}
  \begin{itemize}
  \item element
  \item element
  \end{itemize}
\end{beamercolorbox}
\end{frame}

\end{document}

答案1

考虑到颜色框的构建方式，目前我发现的唯一方法是重新定义\beamerboxesrounded，如在中实现的，并beamerbaseboxes.sty使用\pgfsetfillopacity控制所需的值\opacitylevel；下面的代码显示了这种重新定义（有变化的行用信号表示%NEW）：

\documentclass[xcolor=usenames,dvipsnames]{beamer}

\colorlet{color1}{PineGreen}

 \mode<presentation>
{
\usetheme{default}
\usecolortheme{lily}
\usefonttheme{professionalfonts}
\setbeamercolor{alert}{fg=red!80!black}
\setbeamercolor{text1}{fg=color1!80!black}
\setbeamercolor{text2}{fg=black}
\setbeamercolor{structure}{fg=color1!80!black}
\setbeamercolor{frametitle}{fg=red!80!black}
\setbeamercolor{box1}{fg=black,bg=Dandelion}
\setbeamercolor{box2}{fg=black,bg=SeaGreen}
\setbeamercolor{box3}{fg=black,bg=Aquamarine}

\setbeamerfont{frametitle}{series=\bfseries}
\setbeamertemplate{frametitle}
{
  \begin{flushright}
    \insertframetitle\par
  \end{flushright}
}
\usebackgroundtemplate{\includegraphics[width=\paperwidth,height=\paperheight]{b}}
\setbeamercovered{transparent}
\setbeamerfont{title}{size=\Large,series=\bfseries,shape=\itshape,family=  \rmfamily}
\setbeamercolor{title}{fg=red!80!black}
}

\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{times}
\usepackage[T1]{fontenc}

\newcommand\opacitylevel{0.35}% change here the opacity level

\makeatletter
\renewcommand\beamerboxesrounded[2][]{%
  \global\let\beamer@firstlineitemizeunskip=\relax%
  \vbox\bgroup%
  \setkeys{beamerboxes}{upper=block title,lower=block body,width=\textwidth,shadow=false}%
  \setkeys{beamerboxes}{#1}%
  {%
    \usebeamercolor{\bmb@lower}%
    \globalcolorstrue%
    \colorlet{lower.bg}{bg}%
  }%
  {%
    \usebeamercolor{\bmb@upper}%
    \globalcolorstrue%
    \colorlet{upper.bg}{bg}%
  }%
  %
  % Typeset head
  %
  \vskip4bp
  \setbox\bmb@box=\hbox{%
    \begin{minipage}[b]{\bmb@width}%
      \usebeamercolor[fg]{\bmb@upper}%
      #2%
    \end{minipage}}%
  \ifdim\wd\bmb@box=0pt%
    \setbox\bmb@box=\hbox{}%
    \ht\bmb@box=1.5pt%
    \bmb@prevheight=-4.5pt%
  \else%
    \wd\bmb@box=\bmb@width%
    \bmb@temp=\dp\bmb@box%
    \ifdim\bmb@temp<1.5pt%
      \bmb@temp=1.5pt%
    \fi%
    \setbox\bmb@box=\hbox{\raise\bmb@temp\hbox{\box\bmb@box}}%
    \dp\bmb@box=0pt%
    \bmb@prevheight=\ht\bmb@box%
  \fi%
  \bmb@temp=\bmb@width%
  \bmb@dima=\bmb@temp\advance\bmb@dima by2.2bp%
  \bmb@dimb=\bmb@temp\advance\bmb@dimb by4bp%
  \hbox{%
    \begin{pgfpicture}{0bp}{+-\ht\bmb@box}{0bp}{+-\ht\bmb@box}
      \ifdim\wd\bmb@box=0pt%
        \color{lower.bg}%
      \else%
        \color{upper.bg}%
      \fi%
      \pgfsetfillopacity{\opacitylevel}%NEW
      \pgfpathqmoveto{-4bp}{-1bp}
      \pgfpathqcurveto{-4bp}{1.2bp}{-2.2bp}{3bp}{0bp}{3bp}
      \pgfpathlineto{\pgfpoint{\bmb@temp}{3bp}}
      \pgfpathcurveto%
      {\pgfpoint{\bmb@dima}{3bp}}%
      {\pgfpoint{\bmb@dimb}{1.2bp}}%
      {\pgfpoint{\bmb@dimb}{-1bp}}%
      \bmb@dima=-\ht\bmb@box%
      \advance\bmb@dima by1pt%NEW
      \pgfpathlineto{\pgfpoint{\bmb@dimb}{\bmb@dima}}
      \pgfpathlineto{\pgfpoint{-4bp}{\bmb@dima}}
      \pgfusepath{fill}
    \end{pgfpicture}%
    \copy\bmb@box%
  }%
  \nointerlineskip%
  \vskip-1pt%
  \ifdim\wd\bmb@box=0pt%
  \else%
  \hbox{%
    \begin{pgfpicture}{0pt}{0pt}{\bmb@width}{6pt}
      \bmb@dima=\bmb@width%
      \advance\bmb@dima by8bp%
      \pgfpathrectangle{\pgfpoint{-4bp}{-1bp}}{\pgfpoint{\bmb@dima}{8bp}}
      \pgfusepath{clip}
      {\pgftransformshift{\pgfpoint{-4bp}{0bp}}\pgftext[left,base]{\pgfuseshading{bmb@transition}}}%
    \end{pgfpicture}%
  }%
  \nointerlineskip%
  \vskip-0.5pt%
  \fi%
  \ifbmb@shadow%
    \setbox\bmb@boxshadow=\hbox{\pgfuseshading{bmb@shadow}}%
    \setbox\bmb@boxshadowball=\hbox{\pgfuseshading{bmb@shadowball}}%
    \setbox\bmb@boxshadowballlarge=\hbox{\pgfuseshading{bmb@shadowballlarge}}%
  \fi%
  \setbox\bmb@colorbox=\hbox{{\pgfpicturetrue\pgfsetfillopacity{\opacitylevel}\pgfsetcolor{lower.bg}}}%NEW
  \setbox\bmb@box=\hbox\bgroup\begin{minipage}[b]{\bmb@width}%
    \vskip2pt%
    \usebeamercolor[fg]{\bmb@lower}%
    \colorlet{beamerstructure}{upper.bg}%
    \colorlet{structure}{upper.bg}%
    %\color{.}%
  }

\makeatother

\begin{document}

\begin{frame}
\frametitle{slide title}
\begin{columns}
\column{0.5\textwidth}
  \begin{beamercolorbox}[shadow=false,rounded=true]{box2}
    {\usebeamercolor[fg]{text2} \bf T1}
    \begin{itemize}
    \item element
    \item element
    \item element
    \item element
    \item element
    \end{itemize}
  \end{beamercolorbox}
\column{0.5\textwidth}
  \begin{beamercolorbox}[shadow=false,rounded=true]{box3}
    {\usebeamercolor[fg]{text2} \bf T2}
    \begin{itemize}
    \item element
    \item element
    \item element
    \item element
    \end{itemize}
  \end{beamercolorbox}
\end{columns}  
\begin{beamercolorbox}[shadow=false,rounded=true]{box1}
  \begin{itemize}
  \item element
  \item element
  \end{itemize}
\end{beamercolorbox}
\end{frame}

\end{document}

在此处输入图片描述

作为background模板，我使用了 Duane Bibby 的 CTAN 狮子。

答案2

您可以使用tcolorbox内部 beamer 主题。这样您就可以用 替换正常的beamercolorboxe，tcolorboxes并且可以轻松调整背景不透明度：

\documentclass[xcolor={dvipsnames}]{beamer}

\setbeamercolor{text2}{fg=black}
\setbeamercolor{box2}{fg=black,bg=SeaGreen}
\usebackgroundtemplate{\includegraphics[width=\paperwidth]{example-grid-100x100bp}}

\useinnertheme[rounded]{tcolorbox}
\makeatletter
\beamer@tcb@patchcolorbox
\makeatother
\tcbset{
  opacityback=0.6, 
}

\begin{document}

\begin{frame}
  \begin{beamercolorbox}[shadow=false,rounded=true]{box2}
    {\usebeamercolor[fg]{text2} \bfseries Title}
    
    content
  \end{beamercolorbox}
\end{frame}

\end{document}

在此处输入图片描述

相关内容