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创建“缓冲区”符号 TikZ

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创建“缓冲区”符号 TikZ

我正在尝试为我的任务图（嵌入式编程）创建一个缓冲区符号，但我在符号顶部看到一个箭头，它应该是一条线，就像框中文本下方的线一样。本质上我只想要一个垂直线不可见的矩形。我的代码如下：

\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[danish]{babel}
\usepackage{tikz}
\usetikzlibrary{automata,arrows}
\usetikzlibrary{shapes,snakes}
\tikzset{
    data/.style={
        draw,
        rectangle split,
        rectangle split parts=4,
        text centered,
    },
    data+/.style={
        data,
        rectangle split every empty part={},% resets empty-part macro (explanation below)
        rectangle split empty part width=\widthof{#1},
        rectangle split empty part height=\heightof{#1},
        rectangle split empty part depth=\depthof{#1},
    },
}
\makeatletter
\pgfdeclareshape{datastore}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{base}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{north east}
  \inheritanchor[from=rectangle]{east}
  \inheritanchor[from=rectangle]{south east}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{south west}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{north west}
  \backgroundpath{
    %  store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y
    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@yb}}
 }
}
\makeatother
\begin{document}
\begin{tikzpicture}[
scale=0.8,
->,>=stealth',
shorten >=1pt,
auto,
node distance=3.5cm,
transform shape,
every node/.style={font=\sffamily\scriptsize},
buffer/.style={rectangle,draw,minimum width=1.5cm,minimum height=1.1cm,align=center},
interrupt/.style={diamond,draw,minimum width=1.5cm,minimum height=1.5cm,align=center},
datastore/.style={draw,shape=datastore,inner sep=.3cm}
]
\node[state,minimum width=1.5cm] (1) {Task};
\node[interrupt] (2) [right of=1 ]{Interrupt};
\node[buffer] (3) [right of=2] {Buffer};
\node[datastore] (4) [right of=3] {Buffer};
\end{tikzpicture}
\end{document}

输出结果如下： 在此处输入图片描述

正如你所看到的，最后一个数字并不漂亮:) 如有任何帮助我们将不胜感激，提前谢谢！

答案1

在此处输入图片描述

\documentclass[11pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[danish]{babel}
\usepackage{tikz}
\usetikzlibrary{automata,arrows}
\usetikzlibrary{shapes,snakes}
\tikzset{
    data/.style={
        draw,
        rectangle split,
        rectangle split parts=4,
        text centered,
    },
    data+/.style={
        data,
        rectangle split every empty part={},% resets empty-part macro (explanation below)
        rectangle split empty part width=\widthof{#1},
        rectangle split empty part height=\heightof{#1},
        rectangle split empty part depth=\depthof{#1},
    },
}
\makeatletter
\pgfdeclareshape{datastore}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{base}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{north east}
  \inheritanchor[from=rectangle]{east}
  \inheritanchor[from=rectangle]{south east}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{south west}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{north west}
  \backgroundpath{
    %  store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y
    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@yb}}
 }
}
\makeatother
\begin{document}
\begin{tikzpicture}[
scale=0.8,
->,>=stealth',
shorten >=1pt,
auto,
node distance=3.5cm,
transform shape,
every node/.style={font=\sffamily\scriptsize},-,% <- protect node from arrow setttings
buffer/.style={rectangle,draw,minimum width=1.5cm,minimum height=1.1cm,align=center},
interrupt/.style={diamond,draw,minimum width=1.5cm,minimum height=1.5cm,align=center},
datastore/.style={draw,shape=datastore,inner sep=.3cm}
]
\node[state,minimum width=1.5cm] (1) {Task};
\node[interrupt] (2) [right of=1 ]{Interrupt};
\node[buffer] (3) [right of=2] {Buffer};
\node[datastore] (4) [right of=3] {Buffer};
\end{tikzpicture}
\end{document}

答案2

问题是，当您定义\backgroundpath新的节点形状时，您只声明了路径，但没有声明如何绘制它（线宽、线条颜色、箭头提示等），这些都是从范围继承的。

由于您的图片使用了选项->，因此默认情况下所有路径的末尾都会有一个箭头（除非使用[-]特定路径的选项覆盖此选项）。

如果您想创建一个样式不依赖于环境选项的形状（例如，边框必须始终为红色，或始终为粗体等），您可以在 而不是 中绘制它\behindbackgroundpath。使用这种方法，您的代码不仅可以包含等，还\backgroundpath可以包含，例如，以及在描边之前设置图形选项的代码。\pgfmoveto{}\pgfusepath{stroke}

例如：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning,arrows}
\makeatletter
\pgfdeclareshape{datastore}{
  \inheritsavedanchors[from=rectangle]
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{base}
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{north east}
  \inheritanchor[from=rectangle]{east}
  \inheritanchor[from=rectangle]{south east}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{south west}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{north west}
  \behindbackgroundpath{
    %  store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y
    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathmoveto{\pgfpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathlineto{\pgfpoint{\pgf@xb}{\pgf@yb}}

    % Draw it, always blue, arrowless and .8mm width
    \pgfsetlinewidth{.8mm}\pgfsetarrows{-}\pgfsetstrokecolor{blue}\pgfusepath{stroke}
 }
}
\makeatother

\begin{document}
\begin{tikzpicture}[->, >=stealth']
  \node[datastore, red]                        (1) {Buffer};
  \node[datastore, black, right=of 1]          (2) {Buffer};
  \node[datastore, black!40!green, right=of 2] (3) {Buffer};
  \draw (1) edge (2) (2) edge (3);
\end{tikzpicture}    
\end{document}

请注意，传递的颜色选项node不会影响背景路径（但会影响文本）。

结果

答案3

正如@Tarass所建议的，代码中的第三行应该省略，我应该使用另一种符号来绘制箭头。这是工作代码：

\begin{tikzpicture}[
scale=0.5,
%->,>=stealth',
shorten >=1pt,
auto,
node distance=3.5cm,
transform shape,
every node/.style={font=\sffamily\scriptsize},
buffer/.style={rectangle,draw,minimum width=1.5cm,minimum height=1.1cm,align=center},
interrupt/.style={diamond,draw,minimum width=1.5cm,minimum height=1.5cm,align=center,text width = 1.5cm, text centered},
datastore/.style={draw,shape=datastore,inner sep=.2cm,text width = 1.5cm, text centered}
]

\node[state,minimum width=1.5cm] (1) {Main Task};

% LCD
\node[buffer] (2) at(4,2) {LCD Buffer};
\node[state,minimum width=1.5cm] (3) at(7.5,2) {LCD task};

% UART
\node[datastore] (4) at(4,0) {Transmit Queue};
\node[datastore] (5) at(4,-1.5) {Receive Queue};
\node[state] (6) at(7.5,-0.75) {Uart task};

% Fan
\node[datastore] (7) at(4,-3.5) {Pump Queue};
\node[datastore] (8) at(4,-5) {Expected Liter Fuel};
\node[state] (9) at(7.5,-4.25) {Pump task};

% Fan
\node[datastore] (10) at(4,-7) {Liter Fuel};
\node[state] (11) at(7.5,-7) {Encoder task};
\node[interrupt] (12) at(11,-7) {Encoder interrupt};

\draw[->,>=stealth'] (1) -- (2) node[above] { };
\draw[->,>=stealth'] (1) -- (4) node[above] { };
\draw[->,>=stealth'] (1) -- (5) node[above] { };
\draw[->,>=stealth'] (1) -- (7) node[above] { };
\draw[->,>=stealth'] (1) -- (8) node[above] { };
\draw[->,>=stealth'] (1) -- (10) node[above] { };

\end{tikzpicture}

输出如下： 在此处输入图片描述

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