timeline.tex

\documentclass[tikz, border = 1 cm]{standalone}

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\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{positioning}
\usetikzlibrary{shapes}
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%%%%%%%%%%%%%%
\def\sc{0.85}
\def\papsize{0.176}
\def\linesize{1.5*\papsize}
\def\timelinelength{18}
\def\timelineheight{9*\linesize}
\def\yearlength{2.895}
\def\ctyearlength{3}
\def\yearheight{0.3}
\def\yearbandheight{0.1*\yearheight}

\tikzset{node distance=0.2cm and 0.1cm}

\tikzstyle{timeline}= 	[rectangle, draw=none, fill=black, opacity=0.2,
				text width=\timelinelength cm, minimum height=\timelineheight cm, text centered,
				inner sep=0pt, outer sep=0pt]
\tikzstyle{border}=	[very thick, draw=black, opacity=0.1]
\tikzstyle{year}=	[text width=\yearlength cm, minimum height=\yearheight cm, text centered, 
				inner sep=0pt, outer sep=0pt, font=\footnotesize]
\tikzstyle{yearband}=	[rectangle, minimum width=\yearlength cm, minimum height=\yearbandheight cm, 
				inner sep=0pt, outer sep=0pt, fill=black, opacity=0.5]
\tikzstyle{line}=		[yearband, minimum width=\timelinelength cm, opacity=0.2]
\tikzstyle{lr}=		[inner sep=0pt, outer sep=0pt]
\tikzstyle{paper}=	[circle, fill=black, draw=black, inner sep=0pt, minimum size=\papsize cm]
\tikzstyle{previous}=	[regular polygon, regular polygon sides=4, fill=black, draw=black, inner sep=0pt, 
				minimum size=1.1*\papsize cm]
\tikzstyle{drag}=	[paper, fill=cyan]
\tikzstyle{pdrag}=	[previous, fill=cyan]
\tikzstyle{heat}=	[paper, fill=red]
\tikzstyle{shapeopt}=	[paper, fill=violet]
\tikzstyle{exp}=		[paper, fill=magenta]
\tikzstyle{micro}=	[paper, fill=orange]
\tikzstyle{pmicro}=	[previous, fill=orange]
\tikzstyle{swimming}=	[paper, fill=green]
\tikzstyle{pswimming}=	[previous, fill=green]
\tikzstyle{review}=	[paper, fill=pink]
\tikzstyle{other}=	[paper, fill=teal]
\tikzstyle{pother}=	[previous, fill=teal]
\tikzstyle{legend}=	[font=\footnotesize]
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\begin{document}

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\begin{tikzpicture}[scale=\sc, every node/.style={scale=\sc}]

	%%% main timeline
	\node[timeline] 	(timeline) at (0.5*\timelinelength,0) {};
	\draw[border] 	($(timeline.north west) + (0pt,1pt)$) -- ($(timeline.north east) + (0pt,1pt)$);
	\draw[border] 	($(timeline.south west) + (0pt,-1pt)$) -- ($(timeline.south east) + (0pt,-1pt)$);

	%%% years
	\node[year, anchor=north west] (2016) at ($(timeline.south west) + (0pt,-5pt)$) {2016};
	\node[year, right=of 2016] (2017) {2017};
	\node[year, right=of 2017] (2018) {2018};
	\node[year, right=of 2018] (2019) {2019};
	\node[year, right=of 2019] (2020) {2020};
	\node[year, right=of 2020] (2021) {2021};
	
	%%% yearbands
	\node[yearband] at ($(2016.north) + (0pt,2pt)$) {};
	\node[yearband] at ($(2017.north) + (0pt,2pt)$) {};
	\node[yearband] at ($(2018.north) + (0pt,2pt)$) {};
	\node[yearband] at ($(2019.north) + (0pt,2pt)$) {};
	\node[yearband] at ($(2020.north) + (0pt,2pt)$) {};
	\node[yearband] at ($(2021.north) + (0pt,2pt)$) {};
	
	%%% horizontal lines
	\node[lr] (bot_left) at (timeline.west |- timeline.south) {};
	\node[lr] (l_l1) at ($(bot_left) + (0pt, 1*\linesize cm)$) {};
	\node[lr] (l_l2) at ($(bot_left) + (0pt, 2*\linesize cm)$) {};
	\node[lr] (l_l3) at ($(bot_left) + (0pt, 3*\linesize cm)$) {};
	\node[lr] (l_l4) at ($(bot_left) + (0pt, 4*\linesize cm)$) {};
	\node[lr] (l_l5) at ($(bot_left) + (0pt, 5*\linesize cm)$) {};
	\node[lr] (l_l6) at ($(bot_left) + (0pt, 6*\linesize cm)$) {};
	\node[lr] (l_l7) at ($(bot_left) + (0pt, 7*\linesize cm)$) {};
	\node[lr] (l_l8) at ($(bot_left) + (0pt, 8*\linesize cm)$) {};

	\node[lr] (bot_right) at (timeline.east |- timeline.south) {};
	\node[lr] (r_l1) at ($(bot_right) + (0pt, 1*\linesize cm)$) {};
	\node[lr] (r_l2) at ($(bot_right) + (0pt, 2*\linesize cm)$) {};
	\node[lr] (r_l3) at ($(bot_right) + (0pt, 3*\linesize cm)$) {};
	\node[lr] (r_l4) at ($(bot_right) + (0pt, 4*\linesize cm)$) {};
	\node[lr] (r_l5) at ($(bot_right) + (0pt, 5*\linesize cm)$) {};
	\node[lr] (r_l6) at ($(bot_right) + (0pt, 6*\linesize cm)$) {};
	\node[lr] (r_l7) at ($(bot_right) + (0pt, 7*\linesize cm)$) {};
	\node[lr] (r_l8) at ($(bot_right) + (0pt, 8*\linesize cm)$) {};
	
	\draw[line] (l_l1) -- (r_l1);
	\draw[line] (l_l2) -- (r_l2);
	\draw[line] (l_l3) -- (r_l3);
	\draw[line] (l_l4) -- (r_l4);
	\draw[line] (l_l5) -- (r_l5);
	\draw[line] (l_l6) -- (r_l6);
	\draw[line] (l_l7) -- (r_l7);
	\draw[line] (l_l8) -- (r_l8);
	
	%%% drag papers
	\node (p) at (2018.west |- l_l1) {};
	\node[drag] at ($(p) + (0.47*\yearlength,0 pt)$) {}; % Koizumi 2018
	\node[pdrag] at ($(p) + (0.64*\yearlength,0 pt)$) {}; % Rabault 2018
	\node (p) at (2019.west |- l_l1) {};
	\node[pdrag] at ($(p) + (0.48*\yearlength,0 pt)$) {}; % Rabault 2019
	\node (p) at (2020.west |- l_l1) {};
	\node[drag] at ($(p) + (0.31*\yearlength,0 pt)$) {}; % Tang 2020
	\node[drag] at ($(p) + (0.33*\yearlength,0 pt)$) {}; % Xu 2020
	\node[drag] at ($(p) + (0.35*\yearlength,0 pt)$) {}; % Holm 2020
	\node[drag] at ($(p) + (0.42*\yearlength,0 pt)$) {}; % Ghraieb 2020
	\node[drag] at ($(p) + (0.46*\yearlength,0 pt)$) {}; % Ren 2020
	\node[drag] at ($(p) + (0.48*\yearlength,0 pt)$) {}; % Paris 2020
	\node[drag] at ($(p) + (0.78*\yearlength,0 pt)$) {}; % Tokarev 2020
	\node[drag] at ($(p) + (0.95*\yearlength,0 pt)$) {}; % Elhawary 2020
	\node (p) at (2021.west |- l_l1) {};
	\node[drag] at ($(p) + (0.44*\yearlength,0 pt)$) {}; % Qin 2021
	
	%%% heat papers
	\node (p) at (2020.west |- l_l2) {};
	\node[heat] at ($(p) + (0.25*\yearlength,0 pt)$) {}; % Beintema 2020
	\node[heat] at ($(p) + (0.90*\yearlength,0 pt)$) {}; % Hachem 2020
		
	%%% exp papers
	\node (p) at (2020.west |- l_l3) {};
	\node[exp] at ($(p) + (0.18*\yearlength,0 pt)$) {}; % Fan 2020
	\node[exp] at ($(p) + (0.55*\yearlength,0 pt)$) {}; % Shimomura 2020
	
	%%% other papers
	\node (p) at (2018.west |- l_l4) {};
	\node[pother] at ($(p) + (0.49*\yearlength,0 pt)$) {}; % Ma 2018
	\node (p) at (2019.west |- l_l4) {};
	\node[other] at ($(p) + (0.79*\yearlength,0 pt)$) {}; % Belus 2019
	\node (p) at (2020.west |- l_l4) {};
	\node[other] at ($(p) + (0.38*\yearlength,0 pt)$) {}; % Novati 2020
	\node (p) at (2021.west |- l_l4) {};
	\node[other] at ($(p) + (0.06*\yearlength,0 pt)$) {}; % Xie 2021
	
	%%% microfluidics papers
	\node (p) at (2018.west |- l_l5) {};
	\node[pmicro] at ($(p) + (0.66*\yearlength,0 pt)$) {}; % Dressler 2018
	\node[micro] at ($(p) + (0.90*\yearlength,0 pt)$) {}; % Lee 2018
	
	%%% swimming papers
	\node (p) at (2016.west |- l_l6) {};
	\node[pswimming] at ($(p) + (0.78*\yearlength,0 pt)$) {}; % Novati 2016
	\node (p) at (2018.west |- l_l6) {};
	\node[pswimming] at ($(p) + (0.10*\yearlength,0 pt)$) {}; % Verma 2018
	\node (p) at (2021.west |- l_l6) {};
	\node[swimming] at ($(p) + (0.05*\yearlength,0 pt)$) {}; % Zhu 2021
	
	%%% shape papers
	\node (p) at (2019.west |- l_l7) {};
	\node[shapeopt] at ($(p) + (0.16*\yearlength,0 pt)$) {}; % Yan 2019
	\node[shapeopt] at ($(p) + (0.64*\yearlength,0 pt)$) {}; % Viquerat 2019
	\node (p) at (2019.west |- l_l7) {};
	\node[shapeopt] at ($(p) + (0.33*\yearlength,0 pt)$) {}; % Yonekura 2019
	\node (p) at (2020.west |- l_l7) {};
	\node[shapeopt] at ($(p) + (0.98*\yearlength,0 pt)$) {}; % Qin 2020
	
	%%% review papers
	\node (p) at (2019.west |- l_l8) {};
	\node[review] at ($(p) + (0.61*\yearlength,0 pt)$) {}; % Garnier 2021
	\node (p) at (2020.west |- l_l8) {};
	\node[review] at ($(p) + (0.02*\yearlength,0 pt)$) {}; % Rabault 2020
	
	%%% legend
	\node[drag] (drag_legend) at ($(timeline.north west) + (5pt, 10 pt)$) {};
	\node[heat, above=of drag_legend] (heat_legend) {};
	
	\node[legend, right=of drag_legend] (drag_legend_txt) {Drag reduction};
	\node[legend, right=of heat_legend] (heat_legend_txt) {Heat transfer};
	
	\node[exp, right=of heat_legend_txt, xshift=15pt] (exp_legend) {};
	\node[other, below=of exp_legend] (other_legend) {};
	
	\node[legend, right=of exp_legend] (exp_legend_txt) {Experimental};
	\node[legend, right=of other_legend] (other_legend_txt) {Others};
	
	\node[micro, right=of exp_legend_txt, xshift=15pt] (micro_legend) {};
	\node[swimming, below=of micro_legend] (swimming_legend) {};
	
	\node[legend, right=of micro_legend] (micro_legend_txt) {Microfluidics};
	\node[legend, right=of swimming_legend] (swimming_legend_txt) {Swimming};
	
	\node[review, right=of micro_legend_txt, xshift=15pt] (review_legend) {};
	\node[shapeopt, below=of review_legend] (shapeopt_legend) {};
	
	\node[legend, right=of review_legend] (review_legend_txt) {Review};
	\node[legend, right=of shapeopt_legend] (shapeopt_legend_txt) {Shape optimization};
	    
\end{tikzpicture}
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\end{document}