平均能量损失

Question

我想编写一个background接受 2 个参数的宏，每个参数可以包含一个以 分隔的数字列表,，以便下面的代码绘制两个带有边框的框。

\usepackage{tikz}
\begin{document}
\begin{center}
  \begin{tikzpicture}[]
    % a box has 3 rows and 4 columns, 
    % the heights of the rows are respectively 1, 2 and 1;
    % the widths of the columns are respectively 1, 2, 2 and 1: 
    \background{1,2,1}{1,2,2,1} 
  \end{tikzpicture}
\end{center}
\begin{center}
  \begin{tikzpicture}[]
    % a box has 4 rows and 3 columns, 
    % the heights of the rows are respectively 1, 2, 3 and 1;
    % the widths of the columns are respectively 1, 2 and 1:
    \background{1,2,3,1}{1,2,1}
  \end{tikzpicture}
\end{center}
\end{document}

绘制边界不是问题，困难的是如何遍历各个参数中的数字background，它们的数量是多种多样的。

有谁知道这是怎么做到的吗？

编辑1：预期第一个框：

预期的第二个框：

Answer 1

你可以使用它\foreach来完成这项工作。下面我修改了@percusse的代码这个答案调整单元格尺寸。

平均能量损失

\documentclass{article}
\usepackage{tikz,etoolbox}
\usetikzlibrary{matrix}

\newcommand\background[2]{
  \let\mymatrixcontent\empty
  \newcommand{\row}{%
    \foreach \j in {#1}{
      \foreach \i in {#2} {%
        \begingroup\edef\x{\endgroup
           \noexpand\gappto\noexpand\mymatrixcontent{|[minimum height=\j cm,minimum width=\i cm,draw]| \&}}\x
        }%
      \gappto\mymatrixcontent{\\}%
    }
  }
  \row
  \matrix[matrix of nodes,ampersand replacement=\&,row sep=-\pgflinewidth,column sep=-\pgflinewidth]{
    \mymatrixcontent
  };
}

\begin{document}
\begin{center}
  \begin{tikzpicture}[]
    % a box has 3 rows and 4 columns, 
    % the heights of the rows are respectively 1, 2 and 1;
    % the widths of the columns are respectively 1, 2, 2 and 1: 
    \background{1,2,1}{1,2,2,1} 
  \end{tikzpicture}
  \begin{tikzpicture}[]
    % a box has 4 rows and 3 columns, 
    % the heights of the rows are respectively 1, 2, 3 and 1;
    % the widths of the columns are respectively 1, 2 and 1:
    \background{1,2,3,1}{1,2,1}
  \end{tikzpicture}
\end{center}
\end{document}

输出