Gantt chart - set width of descriptions to be the same across charts

Question

Hello and thank you for taking the time to look at my question.

I have a \pgfgantt chart that I need to split into a couple as it's too long (I'm using the latest version of \pgfgantt installed yesterday). I'd like to align the charts by their border; I thought maybe inserting 'dummy text' would work but I don't know how to do that. Do you have any suggestions? And if anything jumps out at you in the code (apart from August hanging out on its lonesome for a day) please let me know, I'm still very much learning.

Thanks again.

\documentclass[12pt, a4paper]{article} 
\usepackage[utf8]{inputenc} 
\usepackage{tikz}
\usetikzlibrary{shapes}
\usepackage{pgfgantt}
    \usepackage{lscape}
\begin{document}
    \begin{landscape}

        \centering
    %%%%%%%%%%%%%%%%            Gantt 1             %%%%%%%%%%%%%%%
    \begin{ganttchart}%
        [time slot format = {isodate},% Specify the date format (yyyy-mm-dd)
        x unit = 2.1 mm,
        y unit title = 10 mm,
        y unit chart = 4 mm
        ]%
        {2021-03-01}% Specify start date
        {2021-05-16} % Specify end date 1
        \gantttitlecalendar{month=name, week}%\\
        \ganttnewline
        \ganttbar{Something quite long that's going on}{2021-03-08}{2021-03-14}\\
        \ganttnewline
        \ganttmilestone{Do another relatively wordy thing}{2021-03-08}\\
    \end{ganttchart}

    \vfill

    %%%%%%%%%%%%%%%%            Gantt 2             %%%%%%%%%%%%%%%
    \begin{ganttchart}%
        [time slot format = {isodate},% Specify the date format (yyyy-mm-dd)
        x unit = 2.1 mm,
        y unit title = 10 mm,
        y unit chart = 4 mm
        ]%
        {2021-05-17}% Specify start date
        %       {2021-05-16} % Specify end date 1
        {2021-08-01} % End date 2
        %   {2021-11-26}% Specify end date
        \gantttitlecalendar{month=name, week}%\\
        \ganttnewline
        \ganttbar{Thing 3}  {2021-05-17}{2021-07-11}
    \end{ganttchart}

\end{landscape}

\end{document}

Answer 1

• I do not have a solution: Maybe somebody else can build on top of it.
• I tried to combine the following posts.
• Subcaption vertical alignment
• Rotate Gantt Chart Figure
• Subcaption: Vertical alignment of two images of different vertical size
• Figures: What is the difference between using subfig or subfigure
• But I was not successful. It seems like the size of the ganttchart is not known to the LaTeX system.

---

\documentclass{article} 
\usepackage{pgfgantt}
\usepackage{rotating}
\newsavebox{\myLargestImage}
% https://tex.stackexchange.com/questions/204299
% https://tex.stackexchange.com/questions/106353
% https://tex.stackexchange.com/questions/239128
% https://tex.stackexchange.com/questions/122314
\begin{document}
\begin{figure}
\centering
    % Step 1
    \savebox{\myLargestImage}{%
    \begin{rotate}{90}
    \begin{ganttchart}%
        [time slot format = {isodate},
        x unit = 2.1 mm,
        y unit title = 10 mm,
        y unit chart = 4 mm
        ]%
        {2021-03-01}
        {2021-05-16}
        \gantttitlecalendar{month=name, week}%\
        \ganttnewline
        \ganttbar{Something quite long that's going on}{2021-03-08}{2021-03-14}\
        \ganttnewline
        \ganttmilestone{Do another relatively wordy thing}{2021-03-08}\
    \end{ganttchart}
    \end{rotate}
    }
    % Step 2
    \usebox{\myLargestImage}
\hspace{25mm}
\raisebox{\dimexpr\ht\myLargestImage-\height}{%
    %
    \begin{rotate}{90}
    \begin{ganttchart}%
        [time slot format = {isodate},
        x unit = 2.1 mm,
        y unit title = 10 mm,
        y unit chart = 4 mm
        ]%
        {2021-05-17}
        {2021-08-01}
        \gantttitlecalendar{month=name, week}%\
        \ganttnewline
        \ganttbar{Thing 3}  {2021-05-17}{2021-07-11}
    \end{ganttchart}
    \end{rotate}
    %
    }
\caption{Caption}
\end{figure}
\end{document}

Answer 2

• Alternative solution.
• Use \makebox to have an effective width of zero for the labels!
• I added showframe to show the page borders.
• If you manage to narrow down the chart then it may look good.

---

\documentclass{article} 
\usepackage{pgfgantt}
\usepackage{showframe}
\begin{document}
% http://www-hermes.desy.de/latex/ltx-262.html
% \makebox[width][position]{text}
\begin{figure}
\centering
% Chart 1
    \begin{ganttchart}%
        [time slot format = {isodate},
        x unit = 1.8mm,
        y unit title = 10mm,
        y unit chart = 4mm
        ]%
        {2021-03-01}
        {2021-05-16}
        \gantttitlecalendar{month=name, week}%\
        \ganttnewline
        \ganttbar{\makebox[0mm][r]{text text}}{2021-03-08}{2021-03-14}\
        \ganttnewline
        \ganttmilestone{\makebox[0mm][r]{text}}{2021-03-08}\
    \end{ganttchart}\
% Chart 2
    \begin{ganttchart}%
        [time slot format = {isodate},
        x unit = 1.8mm,
        y unit title = 10mm,
        y unit chart = 4mm
        ]%
        {2021-05-17}
        {2021-08-01}
        \gantttitlecalendar{month=name, week}%\
        \ganttnewline
        \ganttbar{\makebox[0mm][r]{text text text}}{2021-05-17}{2021-07-11}
    \end{ganttchart}
\caption{Caption}
\end{figure}
\end{document}