投影仪中的水平阴影标题

Question

如何在投影仪演示文稿中获得水平阴影标题？

有几个帖子可以做到这一点块标题或者框架标题但我没有找到任何与标题页的标题有关的内容。

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编辑：我正在使用马德里主题，这是我当前配置的 MWE：

\documentclass[xcolor={dvipsnames,svgnames,table},10pt]{beamer}

\usepackage[T1]{fontenc}

\colorlet{titleleft}{Red}
\colorlet{titleright}{Green}

\setbeamercolor*{frametitle}{fg=white}

\makeatletter
\pgfdeclarehorizontalshading[titleleft,titleright]{beamer@frametitleshade}{0.7\paperheight}{%
  color(50pt)=(titleleft);
  color(0.85\paperwidth)=(titleright)}

\defbeamertemplate*{frametitle}{horizontal shading}
{%
  \nointerlineskip%
  \vskip+3pt%
  \hbox{\leavevmode
    \advance\beamer@leftmargin by -12bp%
    \advance\beamer@rightmargin by -12bp%
    \beamer@tempdim=\textwidth%
    \advance\beamer@tempdim by \beamer@leftmargin%
    \advance\beamer@tempdim by \beamer@rightmargin%
    \hskip-\Gm@lmargin\hbox{%
      \setbox\beamer@tempbox=\hbox{\begin{minipage}[b]{\paperwidth}%
          \vbox{}\vskip-.75ex%
          \leftskip0.3cm%
          \rightskip0.3cm plus1fil\leavevmode
          \insertframetitle%
          \ifx\insertframesubtitle\@empty%
            \strut\par%
          \else
            \par{\usebeamerfont*{framesubtitle}{\usebeamercolor[fg]{framesubtitle}\insertframesubtitle}\strut\par}%
          \fi%
          \nointerlineskip
          \vbox{}%
          \end{minipage}}%
      \beamer@tempdim=\ht\beamer@tempbox%
      \advance\beamer@tempdim by 2pt%
      \begin{pgfpicture}{0pt}{0pt}{\paperwidth}{\beamer@tempdim}
        \usebeamercolor{frametitle right}
        \pgfpathrectangle{\pgfpointorigin}{\pgfpoint{\paperwidth}{\beamer@tempdim}}
        \pgfusepath{clip}
        \pgftext[left,base]{\pgfuseshading{beamer@frametitleshade}}
      \end{pgfpicture}
      \hskip-\paperwidth%
      \box\beamer@tempbox%
    }%
    \hskip-\Gm@rmargin%
  }%
    \vskip-2pt
}
\makeatother

\setbeamertemplate{frametitle}[rounded corners]

\title{TEST}

\begin{document}

\begin{frame}
    \titlepage
\end{frame}

\begin{frame}{$\hspace{5em}$\textbf{Test}}
 a Test frame
\end{frame}

\end{document}

我们可以清楚地看到，与框架标题不同，标题没有阴影。

Answer 1

就是这样：

\documentclass[xcolor={dvipsnames,svgnames,table},10pt]{beamer}

\usepackage[T1]{fontenc}

\colorlet{titleleft}{Red}
\colorlet{titleright}{Green}

\setbeamercolor*{frametitle}{fg=white}

\makeatletter
\pgfdeclarehorizontalshading[titleleft,titleright]{beamer@frametitleshade}{0.7\paperheight}{%
  color(50pt)=(titleleft);
  color(0.85\paperwidth)=(titleright)}

\defbeamertemplate*{frametitle}{horizontal shading}
{%
  \nointerlineskip%
  \vskip+3pt%
  \hbox{\leavevmode
    \advance\beamer@leftmargin by -12bp%
    \advance\beamer@rightmargin by -12bp%
    \beamer@tempdim=\textwidth%
    \advance\beamer@tempdim by \beamer@leftmargin%
    \advance\beamer@tempdim by \beamer@rightmargin%
    \hskip-\Gm@lmargin\hbox{%
      \setbox\beamer@tempbox=\hbox{\begin{minipage}[b]{\paperwidth}%
          \vbox{}\vskip-.75ex%
          \leftskip0.3cm%
          \hskip5em
          \rightskip0.3cm plus1fil\leavevmode
          \insertframetitle%
          \ifx\insertframesubtitle\@empty%
            \strut\par%
          \else
            \par{\usebeamerfont*{framesubtitle}{\usebeamercolor[fg]{framesubtitle}\insertframesubtitle}\strut\par}%
          \fi%
          \nointerlineskip
          \vbox{}%
          \end{minipage}}%
      \beamer@tempdim=\ht\beamer@tempbox%
      \advance\beamer@tempdim by 2pt%
      \begin{pgfpicture}{0pt}{0pt}{\paperwidth}{\beamer@tempdim}
        \usebeamercolor{frametitle right}
        \pgfpathrectangle{\pgfpointorigin}{\pgfpoint{\paperwidth}{\beamer@tempdim}}
        \pgfusepath{clip}
        \pgftext[left,base]{\pgfuseshading{beamer@frametitleshade}}
      \end{pgfpicture}
      \hskip-\paperwidth%
      \box\beamer@tempbox%
    }%
    \hskip-\Gm@rmargin%
  }%
    \vskip-2pt
}

\setbeamertemplate{title page}
{
    \vbox{}
    \vfill
    \begingroup
    \centering
  \hbox{\leavevmode
    \advance\beamer@leftmargin by -12bp%
    \advance\beamer@rightmargin by -12bp%
    \beamer@tempdim=\textwidth%
    \advance\beamer@tempdim by \beamer@leftmargin%
    \advance\beamer@tempdim by \beamer@rightmargin%
    \hskip-\Gm@lmargin\hbox{%
        \setbox\beamer@tempbox=\hbox{%
            \hskip24bp              
                \begin{beamercolorbox}[sep=8pt,center,colsep=-4bp,rounded=true,shadow=\beamer@themerounded@shadow]{title}
                \usebeamerfont{title}\inserttitle\par%
                \ifx\insertsubtitle\@empty%
                \else%
                \vskip0.25em%
                {\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
                \fi%     
            \end{beamercolorbox}%
                }
            \beamer@tempdim=\ht\beamer@tempbox%
            \advance\beamer@tempdim by 2pt%
            \begin{pgfpicture}{0pt}{0pt}{\paperwidth}{\beamer@tempdim}
                \usebeamercolor{frametitle right}
                \pgfpathrectangle{\pgfpointorigin}{\pgfpoint{\paperwidth}{\beamer@tempdim}}
                \pgfusepath{clip}
                \pgftext[left,base]{\pgfuseshading{beamer@frametitleshade}}
            \end{pgfpicture}
      \hskip-\paperwidth%
      \box\beamer@tempbox%
    }%
    \hskip-\Gm@rmargin%
  }%
  \vskip-2pt    
    \vskip1em\par
    \begin{beamercolorbox}[sep=8pt,center,colsep=-4bp,rounded=true,shadow=\beamer@themerounded@shadow]{author}
        \usebeamerfont{author}\insertauthor
    \end{beamercolorbox}
    \begin{beamercolorbox}[sep=8pt,center,colsep=-4bp,rounded=true,shadow=\beamer@themerounded@shadow]{institute}
        \usebeamerfont{institute}\insertinstitute
    \end{beamercolorbox}
    \begin{beamercolorbox}[sep=8pt,center,colsep=-4bp,rounded=true,shadow=\beamer@themerounded@shadow]{date}
        \usebeamerfont{date}\insertdate
    \end{beamercolorbox}\vskip0.5em
    {\usebeamercolor[fg]{titlegraphic}\inserttitlegraphic\par}
    \endgroup
    \vfill
}
\makeatother

\setbeamerfont{frametitle}{series=\bfseries}
\setbeamerfont{title}{series=\bfseries}
\setbeamercolor{title}{fg=white}

\title{TEST}

\begin{document}

\begin{frame}[plain]
    \titlepage
\end{frame}

\begin{frame}{Test}
 a Test frame
\end{frame}

\end{document}