头部阴影

Question

我目前正在尝试在 Beamer 中编写以下图像。到目前为止，我得到了这三张图像beamercolorbox，但我无法获得阴影背景。

这是我想要的方面：

\documentclass[xcolor=dvipsnames,14pt]{beamer}
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes}
\usetikzlibrary{calc}
\setlength\fboxsep{0pt}
\setlength\fboxrule{0.5pt}
\setlength\parskip{0.75em}
\setlength\parindent{0pt}
\setbeamersize{text margin left=3mm,text margin right=3mm}{}
\setbeamerfont{section in head/foot}{size=\scriptsize}
\setbeamerfont{subsection in head/foot}{size=\scriptsize}
\setbeamerfont{date in head/foot}{size=\scriptsize}
\setbeamercolor{section in head/foot}{fg=black,bg=gray}
\setbeamercolor{subsection in head/foot}{fg=black,bg=gray}
\setbeamercolor{date in head/foot}{fg=black,bg=gray}
\setbeamertemplate{headline}{
\leavevmode\hbox{%
\begin{beamercolorbox}[wd=54mm,ht=3ex,dp=1ex,right]{section in head/foot}%
\usebeamerfont{section in head/foot}\insertsectionhead\hspace*{2ex}%
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=65mm,ht=3ex,dp=1ex,right]{subsection in head/foot}%
\usebeamerfont{subsection in head/foot}\insertsubsectionhead\hspace*{2ex}%
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=9mm,ht=3ex,dp=1ex,right]{date in head/foot}%
\usebeamerfont{date in head/foot}\insertframenumber{}\hspace*{2ex}%
\end{beamercolorbox}%
}\vskip0pt}

\begin{document}
\section{Section title}
\subsection{Subsection title}
\begin{frame}
\frametitle{Frame title}
some text
\end{frame}
\end{document}

解决方案：实际上，我只需将阴影放在 hbox 中并使用\hskip和\vskip。以下是解决方案：

\setbeamertemplate{headline}{
\leavevmode%
\hskip-1mm\hbox{%
\pgfdeclarehorizontalshading{beamer@topshade}{4ex}{
color(0mm)=(headsectionback1); 
color(54mm)=(headsectionback2);
color(54.001mm)=(headsubsectionback1); 
color(119mm)=(headsubsectionback2);
color(119.001mm)=(headpageback); 
color(128mm)=(headpageback)}
\pgfuseshading{beamer@topshade}
}\hskip-128mm\vskip-4ex%
\hbox{%
\begin{beamercolorbox}[wd=54mm,ht=3ex,dp=1ex,right]{section in head/foot}%
\usebeamerfont{section in head/foot}\insertsectionhead\hspace*{2ex}
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=65mm,ht=3ex,dp=1ex,right]{subsection in head/foot}%
\usebeamerfont{subsection in head/foot}\insertsubsectionhead\hspace*{2ex}
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=9mm,ht=3ex,dp=1ex,right]{date in head/foot}%
\usebeamerfont{date in head/foot}\insertframenumber{}\hspace*{2ex}
\end{beamercolorbox}%
}\vskip0pt%
}

Answer 1

让我们假设所谓的阴影背景放置在headline模板中。

在这种情况下，答案提供了一种插入垂直阴影背景或简单背景的方法。

简单背景

\documentclass[xcolor=dvipsnames,14pt]{beamer}
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes}
\usetikzlibrary{calc}
\setlength\fboxsep{0pt}
\setlength\fboxrule{0.5pt}
\setlength\parskip{0.75em}
\setlength\parindent{0pt}
\setbeamersize{text margin left=3mm,text margin right=3mm}{}
\setbeamerfont{section in head/foot}{size=\scriptsize}
\setbeamerfont{subsection in head/foot}{size=\scriptsize}
\setbeamerfont{date in head/foot}{size=\scriptsize}
\setbeamercolor{section in head/foot}{fg=black,bg=gray}
\setbeamercolor{subsection in head/foot}{fg=black,bg=gray}
\setbeamercolor{date in head/foot}{fg=black,bg=gray}

% uniform color
\setbeamercolor{shadedhead}{bg=blue}

\setbeamertemplate{headline}{
\leavevmode\hbox{%
\begin{beamercolorbox}[wd=54mm,ht=3ex,dp=1ex,right]{section in head/foot}%
\usebeamerfont{section in head/foot}\insertsectionhead\hspace*{2ex}%
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=65mm,ht=3ex,dp=1ex,right]{subsection in head/foot}%
\usebeamerfont{subsection in head/foot}\insertsubsectionhead\hspace*{2ex}%
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=9mm,ht=3ex,dp=1ex,right]{date in head/foot}%
\usebeamerfont{date in head/foot}\insertframenumber{}\hspace*{2ex}%
\end{beamercolorbox}%
}\vskip0pt
\leavevmode\hbox{%
% uniform
\begin{beamercolorbox}[wd=\textwidth,ht=3ex,dp=2ex]{shadedhead}%
\end{beamercolorbox}%

}\vskip0pt
}

\begin{document}
\section{Section title}
\subsection{Subsection title}
\begin{frame}
\frametitle{Frame title}
some text
\end{frame}

\begin{frame}
\frametitle{Frame title 2}
some text
\end{frame}

\subsection{Subsection second title}
\begin{frame}
\frametitle{Frame title}
some text
\end{frame}

\begin{frame}
\frametitle{Frame title 2}
some text
\end{frame}
\end{document}

背景已通过以下方式插入：

\leavevmode\hbox{%
% uniform
\begin{beamercolorbox}[wd=\textwidth,ht=3ex,dp=2ex]{shadedhead}%
\end{beamercolorbox}%
}

并且可以通过改变以下内容来修改颜色定义：

\setbeamercolor{shadedhead}{bg=blue}

您可以在环境选项中调整尺寸beamercolorbox。

结果的两帧：

带垂直阴影的背景

我们首先定义阴影：

% Shade definition
\pgfdeclareverticalshading{mytopshade}{\paperwidth}{%
    color(0pt)=(gray!40);
    color(10pt)=(gray)}

您可以在 pgfmanual（也相关）中找到有关可能的阴影的更多信息如何创建球形阴影并手动自定义 3D 照明？）。

现在我们在模板中应用此阴影headline：

\leavevmode\hbox{%
\begin{beamercolorbox}[wd=\textwidth,ht=3ex,dp=2ex]{}%
\begin{pgfpicture}{0pt}{0pt}{\paperwidth}{3ex}
    \pgfpathrectangle{\pgfpointorigin}{\pgfpoint{\paperwidth}{3ex}}
    \pgfusepath{clip}
    \pgftext[left,base]{\pgfuseshading{mytopshade}}
  \end{pgfpicture}
\end{beamercolorbox}%
}

整个代码：

\documentclass[xcolor=dvipsnames,14pt]{beamer}
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes}
\usetikzlibrary{calc}
\setlength\fboxsep{0pt}
\setlength\fboxrule{0.5pt}
\setlength\parskip{0.75em}
\setlength\parindent{0pt}
\setbeamersize{text margin left=3mm,text margin right=3mm}{}
\setbeamerfont{section in head/foot}{size=\scriptsize}
\setbeamerfont{subsection in head/foot}{size=\scriptsize}
\setbeamerfont{date in head/foot}{size=\scriptsize}
\setbeamercolor{section in head/foot}{fg=black,bg=gray}
\setbeamercolor{subsection in head/foot}{fg=black,bg=gray}
\setbeamercolor{date in head/foot}{fg=black,bg=gray}

% Shade definition
\pgfdeclareverticalshading{mytopshade}{\paperwidth}{%
    color(0pt)=(gray!40);
    color(10pt)=(gray)}

\setbeamertemplate{headline}{
\leavevmode\hbox{%
\begin{beamercolorbox}[wd=54mm,ht=3ex,dp=1ex,right]{section in head/foot}%
\usebeamerfont{section in head/foot}\insertsectionhead\hspace*{2ex}%
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=65mm,ht=3ex,dp=1ex,right]{subsection in head/foot}%
\usebeamerfont{subsection in head/foot}\insertsubsectionhead\hspace*{2ex}%
\end{beamercolorbox}%
\begin{beamercolorbox}[wd=9mm,ht=3ex,dp=1ex,right]{date in head/foot}%
\usebeamerfont{date in head/foot}\insertframenumber{}\hspace*{2ex}%
\end{beamercolorbox}%
}\vskip0pt
\leavevmode\hbox{%
\begin{beamercolorbox}[wd=\textwidth,ht=3ex,dp=2ex]{}%
\begin{pgfpicture}{0pt}{0pt}{\paperwidth}{3ex}
    \pgfpathrectangle{\pgfpointorigin}{\pgfpoint{\paperwidth}{3ex}}
    \pgfusepath{clip}
    \pgftext[left,base]{\pgfuseshading{mytopshade}}
  \end{pgfpicture}
\end{beamercolorbox}%
}\vskip0pt
}

\begin{document}
\section{Section title}
\subsection{Subsection title}
\begin{frame}
\frametitle{Frame title}
some text
\end{frame}

\begin{frame}
\frametitle{Frame title 2}
some text
\end{frame}

\subsection{Subsection second title}
\begin{frame}
\frametitle{Frame title}
some text
\end{frame}

\begin{frame}
\frametitle{Frame title 2}
some text
\end{frame}
\end{document}

现在，上一个示例的相同帧显示如下：