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从节点/决策框的不同边缘绘制箭头

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从节点/决策框的不同边缘绘制箭头

我是 tikz 的新手，不明白如何绘制从决策框的所有边缘到其他节点的线。

在下图中流程图，我如何指定箭头的起点？例如，我想从 Decision1 的底部向 Decision2 的左边缘画一个箭头，但就是不知道该怎么做。

我的代码：

\documentclass{article}
\usepackage{tikz}
\usepackage{fixltx2e}
\usetikzlibrary{shapes,arrows}
\usetikzlibrary{positioning}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>
\begin{document}
\pagestyle{empty}

% Define block styles
\tikzstyle{decision} = [diamond, draw, fill=blue!20, 
    text width=6.5em, text badly centered, node distance=3cm, inner sep=0pt]
\tikzstyle{block} = [rectangle, draw, fill=blue!20, 
    text width=10em, text centered, rounded corners, minimum height=4em]
\tikzstyle{mycircle} = [circle, thick, draw=orange, minimum height=4mm]

\tikzstyle{line} = [draw, -latex']
\tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=3cm,
    minimum height=2em]

\begin{tikzpicture}[align=center,node distance = 2cm, auto]
    % Place nodes
    \node [block] (init) {Read system data};
    \node [block, right of=init, node distance=6cm] (trip) {Trip};

    \node [block, below of=init, node distance=2.7cm] (setloadavg)
             {Set average loading level to L\textsubscript{avg}=[0.8,0.9,1,1.1]};
    \node [decision, right of=setloadavg, node distance=6cm] (decision2) {Decision2};
    \node [block, right of=decision2, node distance=3cm] (stop1) {Stop};

    \node [block, below of=setloadavg, node distance=3cm] (setk) {Set K};
    \node [decision, right of=setk, node distance=6cm] (decision3) {Decision3};
    \node [mycircle, right of=decision3, node distance=4cm] (circle1) {1};

    \node [block, below of=setk, node distance=2cm] (startsim)
        {Start simulation (run 1) to generate cascade data, K=0};
    \node [block, right of=startsim, node distance=6cm] (increment) {Increment};
    \node [mycircle, left of=startsim, node distance=4cm] (circle2) {2};

    \node [block, below of=startsim, node distance=3cm] (setloadlevel) {Set Load level};
    \node [decision, right of=setloadlevel, node distance=6cm] (decision4) {Decision4};
    \node [mycircle, right of=decision4, node distance=4cm] (circle3) {2};

    \node [block, below of=setloadlevel, node distance=3cm] (runloadflow) {Run load flow};
    \node [block, right of=runloadflow, node distance=6cm] (stop2) {stop};

    \node [decision, below of=runloadflow, node distance=3cm] (decision1) {Decision1};
    \node [mycircle, left of=decision1, node distance=4cm] (circle2) {1};


    % Draw edges
    \path [line] (init) -- (setloadavg);
    \path [line] (setloadavg) -- (setk);
    \path [line] (setk) -- (startsim);
    \path [line] (startsim) -- (setloadlevel);
    %\path [line] (startsim) -- (circle2);
    \path [line] (setloadlevel) -- (runloadflow);
    \path [line] (runloadflow) -- (decision1);
    \path [line] (decision1) -- node [near start] {Yes} +(3,0) |-  (trip);


\end{tikzpicture}
\end{document}

如果可能的话，我将非常感激对解决方案的一些解释和文档的指向。

谢谢

答案1

一种可能性是：

\documentclass{article}
\usepackage{tikz}
\usepackage{fixltx2e}
\usetikzlibrary{shapes,arrows}
\usetikzlibrary{positioning}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>
\begin{document}
\pagestyle{empty}

% Define block styles
\tikzstyle{decision} = [diamond, draw, fill=blue!20,
    text width=6.5em, text badly centered, node distance=3cm, inner sep=0pt]
\tikzstyle{block} = [rectangle, draw, fill=blue!20,
    text width=10em, text centered, rounded corners, minimum height=4em]
\tikzstyle{mycircle} = [circle, thick, draw=orange, minimum height=4mm]

\tikzstyle{line} = [draw, -latex']
\tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=3cm,
    minimum height=2em]

\begin{tikzpicture}[align=center,node distance = 2cm, auto]
    % Place nodes
    \node [block] (init) {Read system data};
    \node [block, right of=init, node distance=6cm] (trip) {Trip};

    \node [block, below of=init, node distance=2.7cm] (setloadavg)
             {Set average loading level to L\textsubscript{avg}=[0.8,0.9,1,1.1]};
    \node [decision, right of=setloadavg, node distance=6cm] (decision2) {Decision2};
    \node [block, right of=decision2, node distance=3cm] (stop1) {Stop};

    \node [block, below of=setloadavg, node distance=3cm] (setk) {Set K};
    \node [decision, right of=setk, node distance=6cm] (decision3) {Decision3};
    \node [mycircle, right of=decision3, node distance=4cm] (circle1) {1};

    \node [block, below of=setk, node distance=2cm] (startsim)
        {Start simulation (run 1) to generate cascade data, K=0};
    \node [block, right of=startsim, node distance=6cm] (increment) {Increment};
    \node [mycircle, left of=startsim, node distance=4cm] (circle2) {2};

    \node [block, below of=startsim, node distance=3cm] (setloadlevel) {Set Load level};
    \node [decision, right of=setloadlevel, node distance=6cm] (decision4) {Decision4};
    \node [mycircle, right of=decision4, node distance=4cm] (circle3) {2};

    \node [block, below of=setloadlevel, node distance=3cm] (runloadflow) {Run load flow};
    \node [block, right of=runloadflow, node distance=6cm] (stop2) {stop};

    \node [decision, below of=runloadflow, node distance=3cm] (decision1) {Decision1};
    \node [mycircle, left of=decision1, node distance=4cm] (circle2) {1};


    % Draw edges
    \path [line] (init) -- (setloadavg);
    \path [line] (setloadavg) -- (setk);
    \path [line] (setk) -- (startsim);
    \path [line] (startsim) -- (setloadlevel);
    %\path [line] (startsim) -- (circle2);
    \path [line] (setloadlevel) -- (runloadflow);
    \path [line] (runloadflow) -- (decision1);
    \path [line] (decision1) -- node [near start] {Yes} +(3,0) coordinate (my coord) |-  (trip);
    \path [line] (decision1.south) -- +(0,-20pt) -| ([xshift=5pt, yshift=-5pt]my coord) |- (decision2.west);


\end{tikzpicture}
\end{document}

通过在前一条线上放置一个坐标，我们可以在放置新箭头的路径时绕过它。.south和.west是节点和的锚点decision1，decision2对应于您想要的出口和入口点。使用xshift...,yshift...可确保该线靠近前一条线，而不是正位于其上方。

请注意，您的某些语法已过时。例如，您应该使用\tikzset而不是\tikzstyle。

附加箭头

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