Descriptive label for gantttitle

Question

I'm using pgfgantt within MikTeX (both latest version) running fine.
In my gantt diagramm I have three title-lines: First year, than month and beneath the project month.
I'd like to place the text project month in the last title line just aligned like the titles produced by ganttbar.

For better understanding here is a mwe (okay, the progress issues could further be removed)

\documentclass{standalone}
\usepackage{pgfgantt}
\begin{document}
\begin{ganttchart}[vgrid={draw=none,dotted,draw=none},%
                today=15,%
                today offset=.5,%
                today label=Heute,%
                progress=today,%
                bar incomplete/.append style={fill=red},%
                progress label text={\quad\pgfmathprintnumber[precision=0,verbatim]{#1}\%}%
                ]{1}{36}
\gantttitlecalendar*[compress calendar,time slot format=isodate]{2012-5-1}{2015-4-30}{year, month} \\
\gantttitlelist{1,...,36}{1}\\
\ganttbar{Arbeitspaket 1}{1}{4}\\
\ganttbar{Arbeitspaket 2}{3}{24}\\
\ganttbar{Arbeitspaket 3}{17}{36}\\
\end{ganttchart}
\end{document}

and the corresponding result:

Answer 1

Strange that this hasn't been answered before. I suppose you're done with that project by now, but perhaps you, or someone else, is interested in a solution anyways.

I'm not very familiar with pgfgantt, so this solution, while it does work, is not very elegant. Three modifications has been made to your code:

• Add a tikzpicture environment around the pgfgantt environment.
• Give the canvas a node name with canvas/.append style={name=mycanvas} added to the chart options.
• Place a new node with the text project month relative to the top left corner of the canvas node. This requires some trial and error to find an appropriate value.

\documentclass{standalone}
\usepackage{pgfgantt}
\begin{document}
\begin{tikzpicture}
\begin{ganttchart}[vgrid={draw=none,dotted,draw=none},%
                today=15,%
                today offset=.5,%
                today label=Heute,%
                progress=today,%
                bar incomplete/.append style={fill=red},%
                progress label text={\quad\pgfmathprintnumber[precision=0,verbatim]{#1}\%},
                canvas/.append style={name=mycanvas}
                ]{1}{36}
\gantttitlecalendar*[compress calendar,time slot format=isodate]{2012-5-1}{2015-4-30}{year, month} \\
\gantttitlelist{1,...,36}{1}\\
\ganttbar{Arbeitspaket 1}{1}{4}\\
\ganttbar{Arbeitspaket 2}{3}{24}\\
\ganttbar{Arbeitspaket 3}{17}{36}\\
\end{ganttchart}
\node [left] at ([yshift=-2.3cm]mycanvas.north west) {Project month};
\end{tikzpicture}
\end{document}