Vertically center tikz-timing label of custom size

Question

Question

Once I re-size the text of my timing labels, the midpoint of the label seems to shift as indicated by the arrows from the code/image below. It aligns to the bottom of the text instead of the middle. Is there a way to center the tikz-timing label vertically? Related question: LaTeX tikz-timing - adjust fontsize independently for each row label

\vspace does not seem like a good option

Code

    \documentclass[border=4pt]{standalone}
    \usepackage{tikz-timing}
    \newcommand{\arr}[1]{#1 $\Longrightarrow$}
    %
    \begin{document}
    \begin{tikztimingtable}
      \arr                              & 4D{normal} \\
      \arr{\tiny\color{red}}            & 4D{tiny} \\
      \arr{\scriptsize\color{orange}}   & 4D{script} \\
      \arr{\footnotesize\color{yellow}} & 4D{footnote} \\
      \arr{\small\color{green}}         & 4D{small} \\
      \arr{\normalsize\color{blue}}     & 4D{normal} \\
      \arr{\large\color{purple}}        & 4D{large} \\
      \extracode
        \tablegrid
    \end{tikztimingtable}
    \end{document}

Resulting Image

Why would you want to move a label around?

When using tikz-timing along with PGF syntax you might get yourself into a tight-spot where you want to move around tikz-timing labels (which are by default anchored to the bottom of the bounding box).

In the example below, vertical lines, nodes, and line labels are automatically expanded using a \foreach loop all relatively referenced to make expanding the timing diagram easier. In addition, I am taking advantage of the tikz-timing macros inside of my "analog" waveforms as well; see analog_sig1 where I wanted to illustrate an unknown analog output.

I would want to move the "critical_point" label up a little so that I could align to the staggered t0...t15 line labels/nodes.

Problem Illustration

Below is an example waveform I put together with "debug" grids, markings, and vertical lines.

Solution

    {\tiny\color{blue}\raisebox{1mm}{critical\_point$\Longrightarrow$}} &

Answer 1

As you only want to change the label of one row I added a timing/name <row>/.try style to the timing/name style. The .try handler makes it possible to not having to define a timing/name <row> style for every possible <row>.

I have used these name <row> styles twice:

1. The timing/name 1 style sets up the label node so that the baseline is on the same height as the middle of the distance of a D slope.

The .6pt has been found empirical and covers the additional height introduced by the actual D lines.

1. The timing/name 2 style makes use of the append after command key to actually draw that arrow with TikZ.

Code

\documentclass[border=4pt,convert={true,density=600}]{standalone}
\usepackage{tikz-timing}
\usetikzlibrary{arrows}
\newcommand{\arr}[1]{#1 $\Longrightarrow$}
\makeatletter
\tikzset{timing/name/.append style={timing/name \the\c@tikztiming@nrows/.try}}
\makeatother
\begin{document}
    \begin{tikztimingtable}[
        timing/name 1/.append style={
            anchor=east,
            yshift=\timingdslope cm/2+.6pt,
            minimum height=\timingdslope cm,
        },
        timing/name 2/.append style={
            anchor=east,
            yshift=\timingdslope cm/2+.6pt,
            minimum height=\timingdslope cm,
            font=\tiny,
            append after command={
                \pgfextra
                \pgfsetinnerlinewidth{.7pt}
                \pgfsetbuttcap
                \draw [line width=1.3pt,implies-] (\tikzlastnode.east) -- ++(-.25cm,0);
                \endpgfextra
            }
        }
        ]
        \arr                              & 4D{normal} \\
        critical\_point\hspace{.3cm}       & 4D{normal} \\
        \extracode
        \tablegrid
    \end{tikztimingtable}
\end{document}

Output