tikzpicture 前的距离

Question

我想在胶片上画一条任意粗细的水平线，为此我使用了 tikz。一切都很好，只是 LaTeX 在线的开头插入了一个间隙，这让一切看起来不对称。

\documentclass{beamer}

\usepackage{tikz}

\setlength{\parindent}{0pt}
\newcommand{\fhline}[1]{%
    \begin{tikzpicture}[scale=\textwidth/1cm,outer sep=-5mm] 
    \draw[line width=#1pt] (0,0) -- (1,0);
    \end{tikzpicture}}

\title{There Is No Largest Prime Number}
\subtitle{Testttl}
\date[ISPN ’80]{27th International Symposium of Prime Numbers}
\author[Euclid]{Euclid of Alexandria \texttt{[email protected]}}
\setbeamertemplate{title page}
{%
    \fhline{3}  
    \vskip0.2em
    \begin{minipage}{\textwidth}
        \ifx\insertsubtitle\empty
        \usebeamerfont{title}\inserttitle
        \else
        \usebeamerfont{title}\inserttitle\par
        \vskip0.5em
        \usebeamerfont{subtitle}\insertsubtitle
        \fi
    \end{minipage}

    \vskip0.3em

    %greenline
    \fhline{1}

    \vskip3.0cm
    \begin{minipage}{\textwidth}
        \ifx\insertauthor\empty
        \else
        \usebeamerfont{author}\insertauthor\par
        \fi
        \ifx\insertdate\empty
        \else
        \usebeamerfont{author}\insertdate\\
        \fi
    \end{minipage}
    \vskip1.0cm
}

\begin{document}

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

\end{document}

好像：

Answer 1

原则上我同意 @samcarter 的观点，tikz对于绘制水平线来说，这有点过头了，但一旦创建了更多花哨的功能，问题就会变得更加严重。根据我的发现，\centerline这确实有效。在某种程度上，这个“技巧”已经被使用过了这里，在那里人们可以找到这些奇特的线条。

\documentclass{beamer}

\usepackage{tikz}
\usepackage{lipsum}

\setlength{\parindent}{0pt}
\newcommand{\fhline}[1]{%
\centerline{\tikz[scale=\textwidth/1cm,outer sep=-5mm]{% 
\draw[-,line width=#1pt] (0,0) -- (1,0);}}}
\date[$\pi$ day]{27th International Symposium of Prime Numbers}
\title{There Is No Largest Prime Number}
\subtitle{Testttl}

\author[Euclid]{Euclid of Alexandria \texttt{[email protected]}}

\setbeamertemplate{title page}
{%
\fhline{3}  
    \vskip0.2em
    \begin{minipage}{\textwidth}
        \ifx\insertsubtitle\empty
        \usebeamerfont{title}\inserttitle
        \else
        \usebeamerfont{title}\inserttitle\par
        \vskip0.5em
        \usebeamerfont{subtitle}\insertsubtitle
        \fi
    \end{minipage}

    \vskip0.3em

    %greenline
\fhline{1}

    \vskip3.0cm
    \begin{minipage}{\textwidth}
        \ifx\insertauthor\empty
        \else
        \usebeamerfont{author}\insertauthor\par
        \fi
        \ifx\insertdate\empty
        \else
        \usebeamerfont{author}\insertdate\\
        \fi
    \end{minipage}
    \vskip1.0cm
}
\begin{document}

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

\begin{frame}
\frametitle{A somewhat more serious test}
\begin{overlayarea}{\textwidth}{\textheight}
\fhline{3}  
\lipsum[1]
\fhline{2}  
\end{overlayarea}
\end{frame}
\end{document}

请注意，我在尝试复制原始代码时遇到了困难，因为后面的方括号中似乎有一些奇怪的字符\date。

Answer 2

我个人的看法是：tikz画一条简单的线是有点小题大做。

\documentclass{beamer}

\newcommand{\fhline}[1]{%
    \rule{\textwidth}{#1pt}%
}

\title{There Is No Largest Prime Number}
\subtitle{Testttl}
\date[ISPN ’80]{27th International Symposium of Prime Numbers}
\author[Euclid]{Euclid of Alexandria \texttt{[email protected]}}

\setbeamertemplate{title page}{%
        \fhline{3}
    \vskip0.2em
    \begin{minipage}{\textwidth}
        \ifx\insertsubtitle\empty
        \usebeamerfont{title}\inserttitle
        \else
        \usebeamerfont{title}\inserttitle\par
        \vskip0.5em
        \usebeamerfont{subtitle}\insertsubtitle
        \fi
    \end{minipage}
    \vskip0.3em
        \fhline{1}
    \vskip3.0cm
    \begin{minipage}{\textwidth}
        \ifx\insertauthor\empty
        \else
        \usebeamerfont{author}\insertauthor\par
        \fi
        \ifx\insertdate\empty
        \else
        \usebeamerfont{author}\insertdate\\
        \fi
    \end{minipage}
    \vskip1.0cm
}

\begin{document}

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

\end{document}