Cryptocode：删除数字周围烦人的边距

Question

我想用这个cryptocode包把一些盒子连接起来。但我找不到如何有效地做到这一点。我试图改变风格，看看代码……但我找不到这个间距的来源。目前我有一个基于负间距的肮脏解决方案，但问题是间距有时会无缘无故地改变，而且往往会破坏我的绘图。有没有更好的解决方案？

谢谢！

梅威瑟：

\documentclass{article}
\input{include}

\begin{document}
What I have:
\begin{figure}[h]
  \centering%
  \begin{bbrenv}{ctpi2}%
    \begin{bbrbox}[name=$\pi_A$,minheight=15mm]%
      \pseudocode{%
        a \gets 3%
      }%
    \end{bbrbox}%
    \bbrmsgspace{4mm}%
    \bbrmsgfrom{top={$a$}}%
    \bbrqryspace{4mm}%
    \bbrqryto{top={$2a$}}%
  \end{bbrenv}%
  % \hspace*{-2.9mm}%
  \begin{bbrenv}{ctpi2}%
    \begin{bbrbox}[name=$\pi_B$,minheight=15mm]%
    \end{bbrbox}%
    \bbrqryspace{1mm}%
    \bbrqryto{top=,edgestyle={<->}}%
    \bbrqryspace{4mm}%
    \bbrqryto{top={\raisebox{2.5mm}{\vdots}},edgestyle={<->}}%
  \end{bbrenv}%
  % \hspace*{-2.8mm}%
  \begin{bbrenv}{ctpi2}%
    \begin{bbrbox}[name=$\pi_C$,minheight=15mm]%
    \end{bbrbox}%
    \bbrqryspace{5mm}%
    \bbrqryto{top={$3a$}}%
  \end{bbrenv}%
  \caption{My figure}
\end{figure}

What I would like (without dirty space)
\begin{figure}[h]
  \centering%
  \begin{bbrenv}{ctpi2}%
    \begin{bbrbox}[name=$\pi_A$,minheight=15mm]%
      \pseudocode{%
        a \gets 3%
      }%
    \end{bbrbox}%
    \bbrmsgspace{4mm}%
    \bbrmsgfrom{top={$a$}}%
    \bbrqryspace{4mm}%
    \bbrqryto{top={$2a$}}%
  \end{bbrenv}%
  \hspace*{-2.9mm}%
  \begin{bbrenv}{ctpi2}%
    \begin{bbrbox}[name=$\pi_B$,minheight=15mm]%
    \end{bbrbox}%
    \bbrqryspace{1mm}%
    \bbrqryto{top=,edgestyle={<->}}%
    \bbrqryspace{4mm}%
    \bbrqryto{top={\raisebox{2.5mm}{\vdots}},edgestyle={<->}}%
  \end{bbrenv}%
  \hspace*{-2.8mm}%
  \begin{bbrenv}{ctpi2}%
    \begin{bbrbox}[name=$\pi_C$,minheight=15mm]%
    \end{bbrbox}%
    \bbrqryspace{5mm}%
    \bbrqryto{top={$3a$}}%
  \end{bbrenv}%
  \caption{My figure}
\end{figure}
\end{document}