强制将 \subfloat 标签置于 \textwidth 的中心

Question

tikzpicture您可以使用手动设置 s 的边界框\useasboundingbox。要查看边界框当前的样子，您可以添加

\draw (current bounding box.north west) rectangle (current bounding box.south east);

就在之前\end{tikzpicture}。

借助该工具和一些反复试验，您可以找到边界框的合适坐标。例如

\useasboundingbox (0,-3) rectangle (15.9cm,2.8);

对于第一个，

\useasboundingbox (0,-2) rectangle (15.35cm,2.8);

第二个。

在添加\centering之后\begin{figure}（并将序言精简为更简洁的内容），我得到了

（如上所述，框架显示边界框。）

完整代码：

\PassOptionsToPackage{table,dvipsnames,svgnames}{xcolor}
\documentclass[11pt, twoside, a4paper]{report}
\usepackage[inner = 30mm, outer = 20mm,  top = 30mm, bottom = 20mm,     headheight = 13.6pt]{geometry}
\usepackage{xifthen}
\usepackage{tikz}
\usetikzlibrary{calc,fit}
\usepackage[caption=false]{subfig}

\colorlet{A}{gray}
\colorlet{B}{lightgray}
\colorlet{C}{white}

\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}


%https://tex.stackexchange.com/a/349215
\tikzset{
    timeline/.style={arrows={}}%
    ,timeline style/.style={timeline/.append style={#1}}%
    ,year label/.style={font=\small\bfseries,below}%                  <-         removed \sffamily
    ,year label style/.style={year label/.append style={#1}}%
    ,year tick/.style={tick size=0pt}%
    ,year tick style/.style={year tick/.append style={#1}}%
    ,minor tick/.style={tick size=0pt, very thin}%
    ,minor tick style/.style={minor tick/.append style={#1}}%
    ,period/.style={solid,line width=\timelinewidth,line cap=square}%
    ,periodbox/.style={font=\small\bfseries,text=black}%              <-     removed \sffamily
    ,eventline/.style={draw,red,thick,line cap=round,line join=round}%
    ,eventbox/.style={rectangle,rounded corners=3pt,inner     sep=3pt,fill=red!25!white,text     width=3cm,anchor=west,text=black,align=left,font=\small}%
    ,tick size/.code={\def\ticksize{#1}}%
    ,labeled years step/.code={\def\yearlabelstep{#1}}%
    ,minor tick step/.code={\def\minortickstep{#1}}%
    ,year tick step/.code={\def\yeartickstep{#1}}%
    ,enlarge timeline/.code={\def\enlarge{#1}}%
    ,eventboxa/.style={eventbox,text width=#1,draw=A,fill=white}%
    ,eventboxb/.style={eventbox,text width=#1,draw=A,fill=none}%
}

% Still from %https://tex.stackexchange.com/a/349215
\newcommand*{\drawtimeline}[5][]{%
\def\fromyear{#2}%
\def\toyear{#3}%
\def\timelinesize{#4}%
\def\timelinewidth{#5}%
\pgfmathsetmacro{\timelinesizept}{\timelinesize}%
\pgfmathsetmacro{\timelinewidthpt}{\timelinewidth}%
\pgfmathsetmacro{\timelineoffset}{\timelinewidth/2}
\pgfmathsetmacro{\timelineoffsetpt}{\timelineoffset}
%
\begin{scope}[x=1pt, y=1pt, % Change main units to pt
    labeled years step=1,% Set some defaults
    minor tick step=0.25,%
    enlarge timeline=0cm,%
    year tick step=1,#1]
    \pgfmathsetmacro{\enlargept}{\enlarge}
    \pgfmathsetmacro{\yearticksep}{\timelinesize/((\toyear-    \fromyear)/\yeartickstep)}
    \pgfmathsetmacro{\minorticksep}{\timelinesize/((\toyear-\fromyear)/\minortickstep)}
    \pgfmathsetmacro{\minorticklast}{\minorticksep/\minortickstep}
    \foreach \y[remember=\y as \lasty (initially 0), count=\i from \fromyear] in {0,\yearticksep,...,\timelinesizept}{
        \coordinate (Y-\i) at (\y,0);
        \draw[year tick] (\y,-\ticksize/2) --  ++(0,\ticksize);
        \ifnum\i=\toyear\breakforeach\else
        \foreach \q[count=\j from 0] in {0,\minorticksep,...,\minorticklast}
        {
            \coordinate (Y-\i-\j) at (\q+\y,0);
            \draw[minor tick] (\q+\y,-\ticksize/2) -- ++(0,\ticksize);
        };\fi};%
    \pgfmathsetmacro{\nextyear}{int(\fromyear+\yearlabelstep)}
    \draw[timeline] (0,0) -- ++(-\enlargept,0) (0,0) -- ++    (\timelinesizept,0) coordinate (end) -- ++(\enlargept,0);% Timeline
    %    \foreach \y in {\fromyear,\nextyear,...,\toyear} \node[year label] at (Y-\y) {\y};
\end{scope}%

}
% Put a period identifier midway between the start and end of the period

% 1 = color of timeline segment
% 2 = period start
% 3 = period end
% 4 = period text

\newcommand{\period}[5]{\draw[period,#1] (Y-#2) -- (Y-#3)     node[periodbox,#5,midway,text=white] {#4};}


%This somewhat follows @cfr's Chronos. It was certainly inspired by Chronos.
%https://tex.stackexchange.com/a/349236
% 1 = format of line and box
% 2 = year 
% 3 = month
% 4 = day in month
% 5 = pin associated with starting coordinate (well suited to using polar     coordinate)
% 6 = branch at top of pin (well suited to using polar coordinate)
% 7 = Any extra formatting of node
% 8 = Name of node
% 9 = Node content

\newcommand{\vevent}[9]{
\pgfmathtruncatemacro{\syr}{#2}
\pgfmathtruncatemacro{\smth}{#3-1}
\pgfmathsetmacro{\dim}{#4/31}
\ifthenelse{#3=12}{%
    \pgfmathtruncatemacro{\fyr}{#2+1}
    \pgfmathtruncatemacro{\fmth}{0}
}{%
    \pgfmathtruncatemacro{\fyr}{#2}
    \pgfmathtruncatemacro{\fmth}{#3}
}
\draw[eventline,#1]($(Y-\syr-\smth)!\dim!(Y-\fyr-\fmth)$) -- ++(#5) -- ++(#6) node[#7] (#8) {#9};
}

% https://tex.stackexchange.com/questions/255298/draw-rectangular-nodes-defined-by-opposing-corner-coordinates-with-vertically-ce
\tikzset{
block/.style 2 args = {text = white,
    draw=none, inner sep=0, outer sep=0,
    rounded corners=3pt,
    fit=(#1) (#2)}
}

\newcommand{\fnode}[4][]{
\coordinate (bottom left) at (#2);
\coordinate (top right) at (#3);
\node[block={bottom left}{top right}, #1, label=center:#4] {};
}

\begin{document}

\begin{figure}[h]
\centering % <-- added
\subfloat[Subcaption 1]{%
\begin{tikzpicture}
\useasboundingbox (0,-3) rectangle (15.9cm,2.8);
\drawtimeline[
labeled years step=1,
minor tick step=0.083333,
timeline style={draw=gray,line width=\timelinewidthpt},
minor tick style={-,lightgray,tick size=0pt,line width=0pt,yshift=-\timelineoffsetpt},
]%
{2017}{2019}{19cm}{0.5cm};
%
\period{A}{2017-0}{2017-1}{'17}{}
\period{B}{2017-1}{2017-2}{F}{}
\period{A}{2017-2}{2017-3}{M}{}
\period{B}{2017-3}{2017-4}{A}{}
\period{A}{2017-4}{2017-5}{M}{}
\period{B}{2017-5}{2017-6}{J}{}
\period{A}{2017-6}{2017-7}{J}{}
\period{B}{2017-7}{2017-8}{A}{}
\period{A}{2017-8}{2017-9}{S}{}
\period{B}{2017-9}{2017-10}{O}{}
\period{A}{2017-10}{2017-11}{N}{}
\period{B}{2017-11}{2017-12}{D}{}
\period{A}{2018-0}{2018-1}{'18}{}
\period{B}{2018-1}{2018-2}{F}{}
\period{A}{2018-2}{2018-3}{M}{}
\period{B}{2018-3}{2018-4}{A}{}
\period{A}{2018-4}{2018-5}{M}{}
\period{B}{2018-5}{2018-6}{J}{}
\period{A}{2018-6}{2018-7}{J}{}
\period{B}{2018-7}{2018-8}{A}{}
\period{C}{2018-8}{2018-12}{empty}{}
%
\begin{pgfonlayer}{background}
\vevent{A}{2017}{1}{10}{90:1cm}{45:0.5cm}{eventboxa=4cm,anchor=west}{H}{Start of ZoW consortium\\ \footnotesize 10-01-'17}
\vevent{A}{2017}{6}{8}{-90:2cm}{45:-0.5cm}{eventboxa=3cm,anchor=east}{H}{1\textsuperscript{st} Symposium\\ \footnotesize 8 Jun '17}
\vevent{A}{2017}{7}{20}{90:1cm}{45:0.5cm}{eventboxa=2.5cm,anchor=west}{H}{Completion of \\FPV systems\\ \footnotesize 20 Jul '17}
\vevent{A}{2017}{12}{14}{-90:2cm}{45:-0.5cm}{eventboxa=3cm,anchor=east}{H}{2\textsuperscript{nd} Symposium\\ \footnotesize 14 Dec '17}
\vevent{A}{2018}{1}{3}{90:2cm}{45:0.5cm}{eventboxa=2cm,anchor=west}{H}{Storm\\ \footnotesize 3 Jan '18}
\vevent{A}{2018}{1}{18}{90:1cm}{45:0.5cm}{eventboxa=2cm,anchor=west}{H}{Storm\\ \footnotesize 18 Jan '18}
\vevent{A}{2018}{6}{14}{-90:2cm}{45:-0.5cm}{eventboxa=3cm,anchor=east}{H}{3\textsuperscript{rd} Symposium\\ \footnotesize 14 Jun '18}
\end{pgfonlayer}
%
\coordinate (AA) at ([yshift=-1.6cm]$(Y-2018-1)!0.43!(Y-2018-2)$); % Bottom left
\coordinate (BB) at ([yshift=-0.6cm]$(Y-2018-7)!0.32!(Y-2018-8)$); % Top right
\fnode[text = white, fill=blue!50!white]{AA}{BB}{Internship}

\draw (current bounding box.north west) rectangle (current bounding box.south east);
\end{tikzpicture}
}

\subfloat[Internship period]{%
\begin{tikzpicture}
\useasboundingbox (0,-2) rectangle (15.35cm,2.8);
\drawtimeline[
labeled years step=1,
minor tick step=0.083333,
timeline style={draw=gray,line width=\timelinewidthpt},
minor tick style={-,lightgray,tick size=0pt,line width=0pt,yshift=-\timelineoffsetpt},
]%
{2018}{2019}{23cm}{0.5cm};
%
\period{A}{2018-0}{2018-1}{'18}{}
\period{B}{2018-1}{2018-2}{February}{}
\period{A}{2018-2}{2018-3}{March}{}
\period{B}{2018-3}{2018-4}{April}{}
\period{A}{2018-4}{2018-5}{May}{}
\period{B}{2018-5}{2018-6}{June}{}
\period{A}{2018-6}{2018-7}{July}{}
\period{B}{2018-7}{2018-8}{August}{}
\period{C}{2018-8}{2018-12}{empty}{}
%
\begin{pgfonlayer}{background}
\vevent{A}{2018}{3}{14}{90:1cm}{135:0.5cm}{eventboxa=3cm,anchor=east}{H}{AC box installed\\14  Mar '18}
\vevent{A}{2018}{3}{14}{-90:1cm}{45:-0.5cm}{eventboxa=3cm,anchor=east}{H}{New T4T ref. \\14  Mar '18}   
\vevent{A}{2018}{4}{20}{90:2cm}{135:0.5cm}{eventboxa=3cm,anchor=east}{H}{SP box installed\\14 Jun '18}
\vevent{A}{2018}{5}{15}{90:1cm}{135:0.5cm}{eventboxa=3cm,anchor=east}{H}{SP DC connected\\15 May '18}
\vevent{A}{2018}{6}{29}{90:2cm}{135:0.5cm}{eventboxa=3cm,anchor=east}{H}{T4T box installed\\29 Jun '18}
\vevent{A}{2018}{7}{9}{90:1cm}{135:0.5cm}{eventboxa=3cm,anchor=east}{H}{T4T DC connected\\9 Jul '18}        
\vevent{A}{2018}{6}{14}{-90:1cm}{45:-0.5cm}{eventboxa=3cm,anchor=east}{H}{3\textsuperscript{rd} Symposium\\14 Jun '18}

\end{pgfonlayer}
\draw (current bounding box.north west) rectangle (current bounding box.south east);
\end{tikzpicture}
}
\caption{Timelines}
\label{fig:timeline}
\end{figure}
\end{document}

Answer 1