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流程图-决策形状-强制执行 pgf 菱形的方面

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流程图-决策形状-强制执行 pgf 菱形的方面

我正在使用 TikZ/PGF 来构建流程图。为了构建我需要的形状，我使用了flowchart包以及这个优秀的答案。我修改了决定形状的纵横比为 1.5，因为这是德国流程图标准 (DIN 66001) 所规定的。但实际形状的纵横比似乎不符合我的规范。

如何在不说明最小宽度的情况下强制执行该方面和高度？如果我的文本超出了规定的最小宽度，这也能起作用吗？

梅威瑟：

平均能量损失

\documentclass[a4paper]{scrartcl}

\usepackage{tikz}
\tikzset{every picture/.append style={font=\small}} 
\usetikzlibrary{shapes.geometric}


\begin{document}

\begin{tikzpicture}
\tikzset{decision/.style={ % requires library shapes.geometric
        draw,
        diamond,
        aspect=1.5
    }}
\def\minhg{2cm}
\def\minwd{3cm}

\node [decision,minimum width=\minwd,align=left] {\texttt{hh}$\,>1$};
\node [decision,minimum width=\minwd,minimum height=\minhg,red] {};

\end{tikzpicture}

\end{document}

答案1

问题在于，标准diamond形状首先设置其纵横比，然后检查是否满足最小宽度或高度要求，如果不满足，则粗暴地调整宽度或高度，而不考虑纵横比。解决这个问题需要在形状定义中插入额外的代码。下面我制作了一个fdiamond保留纵横比的新形状。这只是diamond代码的副本，添加了 8 行。

示例输出

\documentclass[a4paper]{scrartcl}

\usepackage{tikz}
\tikzset{every picture/.append style={font=\small}} 
\usetikzlibrary{shapes.geometric}

\makeatletter
\pgfdeclareshape{fdiamond}
{
  \savedanchor\outernortheast{%
    %
    % Calculate width and height of the inner rectangle
    %
    \pgf@xa=.5\wd\pgfnodeparttextbox%
    \pgfmathsetlength\pgf@xc{\pgfkeysvalueof{/pgf/inner xsep}}%
    \advance\pgf@xa by\pgf@xc%
    \pgf@ya=.5\ht\pgfnodeparttextbox%
    \advance\pgf@ya by.5\dp\pgfnodeparttextbox%
    \pgfmathsetlength\pgf@yc{\pgfkeysvalueof{/pgf/inner ysep}}%
    \advance\pgf@ya by\pgf@yc%
    %
    % Calculate width and height of diamond
    %
    \pgf@x=\pgf@xa%
    \advance\pgf@x by\pgfshapeaspect\pgf@ya%
    \pgf@y=\pgfshapeaspectinverse\pgf@xa%
    \advance\pgf@y by\pgf@ya%
    %
    % Check against minimum height/width
    %
    \pgfmathsetlength\pgf@xb{\pgfkeysvalueof{/pgf/minimum width}}%
    \pgf@xb=.5\pgf@xb%   
    \ifdim\pgf@x<\pgf@xb%
      % yes, too small. Enlarge...
      \pgf@x=\pgf@xb%
    \fi%
    \pgfmathsetlength\pgf@yb{\pgfkeysvalueof{/pgf/minimum height}}%
    \pgf@yb=.5\pgf@yb%   
    \ifdim\pgf@y<\pgf@yb%
      % yes, too small. Enlarge...
      \pgf@y=\pgf@yb%
    \fi%
    % Fix aspect ratio   %%%ADDED%%%%
    \pgf@xa=\pgfshapeaspect\pgf@y%
    \ifdim\pgf@xa>\pgf@x%
      \pgf@x=\pgf@xa%
    \fi%
    \pgf@ya=\pgfshapeaspectinverse\pgf@x%
    \ifdim\pgf@ya>\pgf@y%
      \pgf@y=\pgf@ya%
    \fi%
    %
    % Add outer border
    %
    \pgfmathsetlength\pgf@xa{\pgfkeysvalueof{/pgf/outer xsep}}%
    \advance\pgf@x by\pgf@xa%
    \pgfmathsetlength\pgf@ya{\pgfkeysvalueof{/pgf/outer ysep}}%
    \advance\pgf@y by\pgf@ya%
  }
  \savedanchor\text{%
    \pgf@x=-.5\wd\pgfnodeparttextbox%
    \pgf@y=-.5\ht\pgfnodeparttextbox%
    \advance\pgf@y by.5\dp\pgfnodeparttextbox%
  }

  %
  % Anchors
  %
  \anchor{text}{\text}%
  \anchor{center}{\pgfpointorigin}%
  \anchor{mid}{%
    \pgf@process{\text}%
    \pgf@x=0pt%
    \pgfmathsetlength\pgf@ya{.5ex}
    \advance\pgf@y by\pgf@ya%
  }
  \anchor{base}{\pgf@process{\text}\pgf@x=0pt  }
  \anchor{north}{\pgf@process{\outernortheast}\pgf@x=0pt}
  \anchor{south}{\pgf@process{\outernortheast}\pgf@x=0pt\pgf@y=-\pgf@y}
  \anchor{west}{\pgf@process{\outernortheast}\pgf@x=-\pgf@x\pgf@y=0pt}
  \anchor{north west}{\pgf@process{\outernortheast}\pgf@x=-.5\pgf@x\pgf@y=.5\pgf@y}
  \anchor{south west}{\pgf@process{\outernortheast}\pgf@x=-.5\pgf@x\pgf@y=-.5\pgf@y}
  \anchor{east}{\pgf@process{\outernortheast}\pgf@y=0pt}
  \anchor{north east}{\pgf@process{\outernortheast}\pgf@x=.5\pgf@x\pgf@y=.5\pgf@y}
  \anchor{south east}{\pgf@process{\outernortheast}\pgf@x=.5\pgf@x\pgf@y=-.5\pgf@y}
  \anchorborder{%
    \pgf@xa=\pgf@x%
    \pgf@ya=\pgf@y%
    \pgf@process{\outernortheast}%
    \ifdim\pgf@xa>0pt%
    \else%
      \pgf@x=-\pgf@x%
    \fi%
    \ifdim\pgf@ya>0pt%
    \else%
      \pgf@y=-\pgf@y%
    \fi%
    \edef\pgf@marshal{%
      \noexpand\pgfpointintersectionoflines
      {\noexpand\pgfpointorigin}
      {\noexpand\pgfqpoint{\the\pgf@xa}{\the\pgf@ya}}
      {\noexpand\pgfqpoint{\the\pgf@x}{0pt}}
      {\noexpand\pgfqpoint{0pt}{\the\pgf@y}}%
    }%
    \pgf@process{\pgf@marshal}%
  }

  %
  % Background path
  %
  \backgroundpath{
    \pgf@process{\outernortheast}%
    \pgf@xc=\pgf@x%
    \pgf@yc=\pgf@y%
    \pgfmathsetlength{\pgf@xa}{\pgfkeysvalueof{/pgf/outer xsep}}%
    \pgfmathsetlength{\pgf@ya}{\pgfkeysvalueof{/pgf/outer ysep}}%
    \advance\pgf@xc by-1.414213\pgf@xa%
    \advance\pgf@yc by-1.414213\pgf@ya%
    \pgfpathmoveto{\pgfqpoint{\pgf@xc}{0pt}}%
    \pgfpathlineto{\pgfqpoint{0pt}{\pgf@yc}}%
    \pgfpathlineto{\pgfqpoint{-\pgf@xc}{0pt}}%
    \pgfpathlineto{\pgfqpoint{0pt}{-\pgf@yc}}%
    \pgfpathclose%
  }
}
\makeatother


\begin{document}

\begin{tikzpicture}
\tikzset{decision/.style={ % requires library shapes.geometric
        draw,
        fdiamond,
        aspect=1.5
    }}
\def\minhg{2cm}
\def\minwd{3cm}

\node [decision,minimum width=\minwd,align=left] {\texttt{hh}$\,>1$};
\node [decision,minimum width=\minwd,minimum height=\minhg,red] {};

\end{tikzpicture}

\end{document}

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