Latex流程图线交叉线

Question

我正在构建一个看起来几乎如我想要的流程图。我想修改的最后一个细节涉及两条相互交叉的线。

这是我的代码：

\tikzstyle{block1}    = [rectangle, rounded corners,  minimum width=3cm, minimum height=1cm, text centered, draw, fill=blue!20, text width=6cm]
\tikzstyle{block2}    = [rectangle, rounded corners,  minimum width=3cm, minimum height=1cm, text centered, draw, fill=blue!20, text width=3cm]
\tikzstyle{decision}  = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw, fill=blue!20, text width=2cm] % node distance=3cm, inner sep=0pt
\tikzstyle{line}      = [draw, -latex']

\begin{figure}[ht]
    \begin{center}
        \begin{tikzpicture}[node distance = 2cm, auto]
        % Place nodes
            \node [block1] (1) {\textbf{\small Study of basic factors}\\    \footnotesize Plant characteristics, mechanisms of nuclide production and waste streams};
            \node [block1, below of=1, node distance=1.8cm]  (2)  {\textbf{\small Development of sampling plan}};
            \node [block1, below of=2, node distance=1.7cm]  (3)  {\textbf{\small Sampling and analysis}};
            \node [block1, below of=3, node distance=2cm]  (4)  {\textbf{\small Observation and evaluation of nuclide activity database}\\  \footnotesize Selecting key nuclide and verifying correlation between DTM nuclides and KN};
            \node [decision, below of=4, node distance=3.2cm]  (5)  {\textbf{\small Applicability of SF method}};
            \node [block2, right of=5, node distance=4cm] (6)  {\textbf{\small Other methods}\\ \footnotesize Mean activity, ...};
            \node [block2, left of=5, node distance=4cm]  (7)  {\textbf{\small Applying statistics}};
            \node [block2, below of=5, node distance=3.5cm] (8) {\textbf{\small SF classifications}\\ \footnotesize Unification and classification of groups};
            \node [block2, left of=8, node distance=4cm] (9) {\textbf{\small Reference}};
            \node [block2, below of=8, node distance=2cm] (10) {\textbf{Determination of SF}};
            \node [block2, left of=10, node distance=4cm] (11) {\textbf{Applying statistics}};
            \node [block2, right of=10, node distance=4cm] (12) {\textbf{Assess KN activity}\\ Dose rate and $\gamma$-spectra};
            \node [decision, below of=10, node distance=2.5cm] (13) {\textbf{Calculation}};
            \node [block1, below of=13, node distance=2.5cm] (14) {\textbf{Determining the activity of DTM}};

        % Draw edges
            \path [line] (1) -- (2);
            \path [line] (2) -- (3);
            \path [line] (3) -- (4);
            \path [line] (4) -- (5);
            \path [line] (4) -| ([xshift=1cm, yshift=0cm]6.east) |- (12);
            \path [line] (7) -- (5);
            \path [line] (5) -- (6);
            \path [line] (6) -| ([xshift=2cm, yshift=0cm]6.east) |-(14);
            \path [line] (5) -- (8);
            \path [line] (9) -- (8);
            \path [line] (8) -- (10);
            \path [line] (11) -- (10);
            \path [line] (10) -- (13);
            \path [line] (12) |- (13);
            \path [line] (13) -- (14);
        \end{tikzpicture}
        \caption{Complete characterization process \cite{iso21238}.}
        \label{fig_1.1}
    \end{center}
\end{figure}

在这里你可以找到它的样子：

我想要的是添加一个圆弧以避免两条线相互交叉；特别是，我希望从“其他方法”块到“确定 DTM 的活动”块之间有一条弧线。

非常感谢你的帮助。

干杯，

比亚焦

Answer 1

诀窍是（1）计算路径1和路径2的交点S，（2）围绕它定义一个圆，然后在其上放置圆弧，（3）正常绘制路径2，除了落在其中的部分(4) 绘制圆弧。

您将需要两个 tikz 库：calc和junctions。

\tikzstyle{block1}    = [rectangle, rounded corners,  minimum width=3cm, minimum height=1cm, text centered, draw, fill=blue!20, text width=6cm]
\tikzstyle{block2}    = [rectangle, rounded corners,  minimum width=3cm, minimum height=1cm, text centered, draw, fill=blue!20, text width=3cm]
\tikzstyle{decision}  = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw, fill=blue!20, text width=2cm]
\tikzstyle{line}      = [draw, -latex']

\begin{tikzpicture}[node distance = 2cm, auto]
    % Place nodes
    \node [block1] (1) {\textbf{\small Study of basic factors}\\    \footnotesize Plant characteristics, mechanisms of nuclide production and waste streams};
    \node [block1, below of=1, node distance=1.8cm]  (2)  {\textbf{\small Development of sampling plan}};
    \node [block1, below of=2, node distance=1.7cm]  (3)  {\textbf{\small Sampling and analysis}};
    \node [block1, below of=3, node distance=2cm]  (4)  {\textbf{\small Observation and evaluation of nuclide activity database}\\  \footnotesize Selecting key nuclide and verifying correlation between DTM nuclides and KN};
    \node [decision, below of=4, node distance=3.2cm]  (5)  {\textbf{\small Applicability of SF method}};
    \node [block2, right of=5, node distance=4cm] (6)  {\textbf{\small Other methods}\\ \footnotesize Mean activity, ...};
    \node [block2, left of=5, node distance=4cm]  (7)  {\textbf{\small Applying statistics}};
    \node [block2, below of=5, node distance=3.5cm] (8) {\textbf{\small SF classifications}\\ \footnotesize Unification and classification of groups};
    \node [block2, left of=8, node distance=4cm] (9) {\textbf{\small Reference}};
    \node [block2, below of=8, node distance=2cm] (10) {\textbf{Determination of SF}};
    \node [block2, left of=10, node distance=4cm] (11) {\textbf{Applying statistics}};
    \node [block2, right of=10, node distance=4cm] (12) {\textbf{Assess KN activity}\\ Dose rate and $\gamma$-spectra};
    \node [decision, below of=10, node distance=2.5cm] (13) {\textbf{Calculation}};
    \node [block1, below of=13, node distance=2.5cm] (14) {\textbf{Determining the activity of DTM}};

    % Draw edges
    \path [line] (1) -- (2);
    \path [line] (2) -- (3);
    \path [line] (3) -- (4);
    \path [line] (4) -- (5);
    \path [line,name path=4to12] (4) -| ([xshift=1cm, yshift=0cm]6.east) |- (12);
    \path [line] (7) -- (5);
    \path [line] (5) -- (6);
    % Define the path but without drawing.
    \path [name path=6to14] (6) -| ([xshift=2cm, yshift=0cm]6.east) |-(14);
    \path [line] (5) -- (8);
    \path [line] (9) -- (8);
    \path [line] (8) -- (10);
    \path [line] (11) -- (10);
    \path [line] (10) -- (13);
    \path [line] (12) |- (13);
    \path [line] (13) -- (14);

    % Find the intersection of the two paths.
    \path [name intersections={of=4to12 and 6to14}];
    \coordinate (S)  at (intersection-1);

    % Define a circle around this intersection for the arc.
    \path[name path=circle] (S) circle(2mm);

    % Find the intersections of second line and circle.
    \path [name intersections={of=circle and 6to14}];
    \coordinate (I1)  at (intersection-1);
    \coordinate (I2)  at (intersection-2);

    % Draw normal line segments, except for portion within circle.
    \draw (6) -- (I2);
    \draw[->] (I1)  -| ([xshift=2cm, yshift=0cm]6.east) |- (14);

    % Draw arc at intersection
    \draw (I2) arc (180:0:2mm);
\end{tikzpicture}