用尾随零标记时间轴

Question

我正在制作一个时间轴（跨越小时，而不是天/年），并用数字时间标记（例如 1:15、5:45、3:00）。一切都以分钟为单位计算。我遇到的问题是整点时间，其中分钟显示为零，而不是双零：

有没有简单的方法可以做到这一点，或者最好对 if-then 进行硬编码？

这是 MWE（基于此站点某处的数字线代码，不记得在哪里了）：

\documentclass[10pt,oneside]{article}
\usepackage[margin=0.5in,a4paper,landscape]{geometry}
\usepackage{tikz}
\newcommand{\drawtimeline}[5]
{
\pgfmathsetmacro\starttime{#1*60+#2}
\pgfmathsetmacro\endtime{#3*60+#4}
\pgfmathsetmacro\timediff{\endtime-\starttime}
\pgfmathsetmacro\numticks{\timediff} 
\pgfmathsetmacro\numlabels{\timediff/15}
\pgfmathsetmacro\intervallabel{#5/\numlabels}
\pgfmathsetmacro\intervaltick{#5/\numticks}
\pgfmathsetmacro\extraticks{\numticks+2}
\begin{tikzpicture}
    %draw line
    \draw [thick](-2*\intervaltick pt,0) -- (#5+2*\intervaltick pt,0);
    %draw small ticks
    \foreach \y  in {-2,-1,..., \extraticks } {
        \draw[thin, yshift=0 cm, xshift= \intervaltick  * \y ] (0pt,+4pt) -- (0pt,-3pt);}
    %draw big ticks and labels
    \foreach \y  
    [evaluate=\y as \hrs using ({div(\y * 15 + \starttime,60)}] 
    [evaluate=\y as \mins using ({mod(\y * 15 +\starttime,60)}]
    in {0,1,...,\numlabels}
    { 
    \draw[yshift=-0.5 cm, xshift = \intervallabel * \y ] node[ below]{$\pgfmathprintnumber{\hrs}$:$\pgfmathprintnumber{\mins}$};
    \draw[thick, yshift=0 cm, xshift= \intervallabel  * \y ] (0pt,+8pt) -- (0pt,-8pt);}
\end{tikzpicture}

}

\begin{document}
\drawtimeline{5}{45}{6}{30}{25cm}

\end{document}

Answer 1

在我确定\mins输出字符串像15.0和之后0.0，我将\pgfmathprintnumber{\mins}输出替换为\twodigit{\mins}，其中\twodigit定义为

\newcommand\twodigit[1]{\expandafter\twodigitaux#1\relax}
\def\twodigitaux#1.#2\relax{\ifnum10>#1\relax0\fi\pgfmathprintnumber{#1.#2}}

这样，如果预点数\mins小于10，则在输出中添加一个额外的点0。例如，\twodigit{7.23}产生07.23。

\documentclass[10pt,oneside]{article}
\usepackage[margin=0.5in,a4paper,landscape]{geometry}
\usepackage{tikz}
\newcommand{\drawtimeline}[5]
{
\pgfmathsetmacro\starttime{#1*60+#2}
\pgfmathsetmacro\endtime{#3*60+#4}
\pgfmathsetmacro\timediff{\endtime-\starttime}
\pgfmathsetmacro\numticks{\timediff} 
\pgfmathsetmacro\numlabels{\timediff/15}
\pgfmathsetmacro\intervallabel{#5/\numlabels}
\pgfmathsetmacro\intervaltick{#5/\numticks}
\pgfmathsetmacro\extraticks{\numticks+2}
\begin{tikzpicture}
    %draw line
    \draw [thick](-2*\intervaltick pt,0) -- (#5+2*\intervaltick pt,0);
    %draw small ticks
    \foreach \y  in {-2,-1,..., \extraticks } {
        \draw[thin, yshift=0 cm, xshift= \intervaltick  * \y ] (0pt,+4pt) -- (0pt,-3pt);}
    %draw big ticks and labels
    \foreach \y  
    [evaluate=\y as \hrs using ({div(\y * 15 + \starttime,60)}] 
    [evaluate=\y as \mins using ({mod(\y * 15 +\starttime,60)}]
    in {0,1,...,\numlabels}
    { 
    \draw[yshift=-0.5 cm, xshift = \intervallabel * \y ] node[ below]{%
      $\pgfmathprintnumber{\hrs}$:%
      $\twodigit{\mins}$};
    \draw[thick, yshift=0 cm, xshift= \intervallabel  * \y ] (0pt,+8pt) -- (0pt,-8pt);}
\end{tikzpicture}
}
\newcommand\twodigit[1]{\expandafter\twodigitaux#1\relax}
\def\twodigitaux#1.#2\relax{\ifnum10>#1\relax0\fi\pgfmathprintnumber{#1.#2}}
\begin{document}
\drawtimeline{5}{45}{6}{30}{25cm}
\end{document}