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从贝塞尔曲线转移控制点

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从贝塞尔曲线转移控制点

是否可以向贝塞尔曲线的控制点添加偏移量，以使我的红线穿过点云的中心？这是我的 mwe：

\documentclass{article}
\usepackage{xcolor}
\usepackage{tikz} 
    \usetikzlibrary{chains}
    \usetikzlibrary{positioning}
    \usetikzlibrary{backgrounds}
    \usetikzlibrary{trees}

\usetikzlibrary{arrows,automata}
\usepackage{epstopdf}
\definecolor{mycolor}{RGB}{8,108,131}
\usepackage{array}
\usepackage{adjustbox}      
\usetikzlibrary{shapes}

\begin{document}
    \begin{tikzpicture}[
        scale=0.8,
        transform shape,
        show background rectangle,
        background rectangle/.style={fill=gray!10},
        box/.style={draw, font=\itshape}
          ]
        \coordinate (b) at (current page.center);
        \node [
            label=right:XXX, 
        ] (firewall)at(b) {\includegraphics[width=9mm]{example-image-a}};
        \node [
            label=above:XXX
        ] (client) at ([yshift=2cm]firewall){\includegraphics[width=9mm]{example-image-a}};
        \node [
            label=XXX
        ] (dnsServer)  at([xshift=-5cm]firewall){\includegraphics[width=9mm]{example-image-a}};
       \node [
            label=center:XXX,
        ] (cloud) at ([yshift=-2cm]firewall){\includegraphics[width=9mm]{example-image-b}};
        \node [
            label=below:XXX
        ] (server1) at([xshift=5cm]cloud){\includegraphics[width=9mm]{example-image-a}};
        \node [
            label=right:XXX
        ] (server2) at([xshift=5cm]server1){\includegraphics[width=9mm]{example-image-a}};
       \draw [thick,mycolor,->](client) .. controls  (firewall) .. (dnsServer)node[very near start, left]{1};
        \draw [thick,mycolor,->](dnsServer) .. controls (firewall)and (cloud) .. (server1)node[very near end, left]{2};
        \draw [thick,mycolor,<->](server1)--(server2)node[midway,above]{3 et 4};
        \draw [thick,mycolor,->](server1) .. controls  (cloud) and (firewall)..  (client)node[very near start, right]{5};
        \draw [thick,red,->](client) .. controls  (firewall) and (cloud)..  (server1)node[]{};
        \path[mycolor,->] (client) edge  [loop right] node {6} ();
    \end{tikzpicture}
\end{document}

输出如下： 输出

答案1

这是否接近您的要求：

在此处输入图片描述

\documentclass{article}
\usepackage{xcolor}
\usepackage{tikz} 
    \usetikzlibrary{chains}
    \usetikzlibrary{positioning}
    \usetikzlibrary{backgrounds}
    \usetikzlibrary{trees}

\usetikzlibrary{arrows,automata}
\usepackage{epstopdf}
\definecolor{mycolor}{RGB}{8,108,131}
\usepackage{array}
\usepackage{adjustbox}      
\usetikzlibrary{shapes}

\begin{document}
    \begin{tikzpicture}[
        scale=0.8,
        transform shape,
        show background rectangle,
        background rectangle/.style={fill=gray!10},
        box/.style={draw, font=\itshape}
          ]
        \coordinate (b) at (current page.center);
        \node [
            label=right:XXX, 
        ] (firewall)at(b) {\includegraphics[width=9mm]{example-image-a}};
        \node [
            label=above:XXX
        ] (client) at ([yshift=2cm]firewall){\includegraphics[width=9mm]{example-image-a}};
        \node [
            label=XXX
        ] (dnsServer)  at([xshift=-5cm]firewall){\includegraphics[width=9mm]{example-image-a}};
       \node [
            %label=center:XXX,
        ] (cloud) at ([yshift=-2cm]firewall){\includegraphics[width=9mm]{example-image-b}};
        \node [
            label=below:XXX
        ] (server1) at([xshift=5cm]cloud){\includegraphics[width=9mm]{example-image-a}};
        \node [
            label=right:XXX
        ] (server2) at([xshift=5cm]server1){\includegraphics[width=9mm]{example-image-a}};
       \draw [thick,mycolor,->](client) .. controls  (firewall) .. (dnsServer)node[very near start, left]{1};
        \draw [thick,mycolor,->](dnsServer) .. controls (firewall)and (cloud) .. (server1)node[very near end, left]{2};
        \draw [thick,mycolor,<->](server1)--(server2)node[midway,above]{3 et 4};
        \draw [thick,mycolor,->](server1) .. controls  (cloud) and (firewall)..  (client)node[very near start, right]{5};
        \draw [thick,red,->](client) .. controls  ([yshift=-2.5cm]firewall) and ([xshift=-1cm]cloud)..  (server1)node[]{};
        \path[mycolor,->] (client) edge  [loop right] node {6} ();
    \end{tikzpicture}
\end{document}

答案2

而@Hafid Boukhoulda 给出了灵活，通用方法进行偏移，将两个控制点设置为同一点(cloud)使得 Beizer 曲线看起来流畅、简洁、美观——因此如果它满足您的要求，那么可能是另一个值得考虑的选择。

在此处输入图片描述

...我使用的代码是：

\documentclass{article}
\usepackage{xcolor}
\usepackage{tikz} 
  \usetikzlibrary{chains}
  \usetikzlibrary{positioning}
  \usetikzlibrary{backgrounds}
  \usetikzlibrary{trees}

\usetikzlibrary{arrows,automata}
\usepackage{epstopdf}
\definecolor{mycolor}{RGB}{8,108,131}
\usepackage{array}
\usepackage{adjustbox}    
\usetikzlibrary{shapes}

\begin{document}
  \begin{tikzpicture}[
    scale=0.8,
    transform shape,
    show background rectangle,
    background rectangle/.style={fill=gray!10},
    box/.style={draw, font=\itshape}
    ]
    \coordinate (b) at (current page.center);
    \node [label=right:XXX] 
       (firewall)at(b) {\includegraphics[width=9mm]{example-image-a}};
    \node [label=above:XXX] 
       (client) at ([yshift=2cm]firewall){\includegraphics[width=9mm]{example-image-a}};
    \node [label=XXX]
       (dnsServer)  at([xshift=-5cm]firewall){\includegraphics[width=9mm]{example-image-a}};
    \node [label=center:{}]
       (cloud) at ([yshift=-2cm]firewall){\includegraphics[width=9mm]{example-image-b}};
    \node [label=below:XXX]
       (server1) at([xshift=5cm]cloud){\includegraphics[width=9mm]{example-image-a}};
    \node [label=right:XXX]
       (server2) at([xshift=5cm]server1){\includegraphics[width=9mm]{example-image-a}};
    \draw [thick,mycolor,->](client) .. controls  (firewall) .. (dnsServer)node[very near start, left]{1};
    \draw [thick,mycolor,->](dnsServer) .. controls (firewall)and (cloud) .. (server1)node[very near end, left]{2};
    \draw [thick,mycolor,<->](server1)--(server2)node[midway,above]{3 et 4};
    \draw [thick,mycolor,->](server1) .. controls  (cloud) and (firewall)..  (client)node[very near start, right]{5};
    \draw [thick,red,->](client) .. controls (cloud) ..  (server1)node[]{};
                        % only one control (cloud) instead of two
    \path[mycolor,->] (client) edge  [loop right] node {6} ();
  \end{tikzpicture}
\end{document}

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