使用 tikz 绘制曲线

Question

考虑：

\documentclass[a4paper, 11pt]{article}

\usepackage[protrusion=true,expansion=true]{microtype} % Better typography
\usepackage{graphicx} % Required for including pictures
\usepackage{wrapfig} % Allows in-line images
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,positioning}
\usetikzlibrary{calc,decorations.markings}
\usepackage{mathpazo} % Use the Palatino font
\usepackage[T1]{fontenc}

\tikzstyle{error} = [circle, draw, fill=red!20,
text width=4.0em, text badly centered, node distance=3cm, inner sep=0pt]
\tikzstyle{block} = [rectangle, draw, fill=blue!20,
text width=5em, text centered, rounded corners, minimum height=4em]
\tikzstyle{line} = [draw, -latex']
\tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=3cm,
minimum height=2em]

\begin{document}

\begin{tikzpicture}[node distance = 2cm, auto]
% Place nodes

\node [block] (X1) {X1};
\node [block, below of=X1, node distance=3cm] (X2) {X2};
\node [block, below right = .25cm and 1.5cm of X1] (Y) {Y};
\node [error, right of = X1, node distance=3.7cm] (error) {error};
% Draw edges

\path [line] (X1) -- (X2);
%\path [line] (error) -- node {1}(X1);

\end{tikzpicture}
\end{document}

我正在寻找一种方法在 X1 和 X2 之间绘制一条弯曲的双头箭头，如下所示：

有什么建议么？

Answer 1

我做了以下事情：

• 通过删除所有未使用的库和包，将您的代码示例精简为最小工作示例 (MWE)。
• 在使用样式的定义中使用最新的语法（\tikzstyle已弃用）。
• 对于图片元素的定位，使用由库确定的语法positioning（观察...=of ...和之间的区别...=of ...）。

• 对于块之间的箭头我使用选项bend right：

  \documentclass[tikz, margin=3mm]{standalone}
  \usetikzlibrary{arrows.meta, calc, positioning}
  
  \tikzset{
  error/.style = {circle, draw, fill=red, align=center,
                  inner sep=0pt},
  block/.style = {rectangle, draw, fill=blue!20, rounded corners,
                  text width=5em, minimum height=4em, align=center},
          }
  
  \begin{document}
      \begin{tikzpicture}[
  node distance = 8mm and 12mm
                          ]
  % Place nodes
  \node [block] (X1) {X1};
  \node [block, below=of X1] (X2) {X2};
  \node [block, below right=of X1] (Y) {Y};
  \node [error, right=of X1] (error) {error};
  % Draw edges
  \draw [Latex-Latex] (X1.west) to[bend right=45] (X2.west);
  \end{tikzpicture}
  \end{document}
  

注意：我没有费心精确复制您的节点的位置。

Answer 2

这是你想要的吗？

\documentclass[a4paper, 11pt]{article} 

\usepackage[protrusion=true,expansion=true]{microtype} % Better typography
\usepackage{graphicx} % Required for including pictures
\usepackage{wrapfig} % Allows in-line images
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,positioning}
\usetikzlibrary{calc,decorations.markings} 
\usepackage{mathpazo} % Use the Palatino font
\usepackage[T1]{fontenc}

\tikzstyle{error} = [circle, draw, fill=red!20, 
text width=4.0em, text badly centered, node distance=3cm, inner sep=0pt]
\tikzstyle{block} = [rectangle, draw, fill=blue!20, 
text width=5em, text centered, rounded corners, minimum height=4em]
\tikzstyle{line} = [draw, -latex']
\tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=3cm,
minimum height=2em]

\begin{document}

\begin{tikzpicture}[node distance = 2cm, auto]
% Place nodes

\node [block] (X1) {X1};
\node [block, below of=X1, node distance=3cm] (X2) {X2};
\node [block, below right = .25cm and 1.5cm of X1] (Y) {Y};
\node [error, right of = X1, node distance=3.7cm] (error) {error};
% Draw edges

\path [<->] (X1) edge[bend right=90] (X2);
%\path [line] (error) -- node {1}(X1);

\end{tikzpicture} 
\end{document}

Answer 3

in您可以使用和控制“撞击角度” out。

\documentclass[a4paper, 11pt]{article} 

\usepackage[protrusion=true,expansion=true]{microtype} % Better typography
\usepackage{graphicx} % Required for including pictures
\usepackage{wrapfig} % Allows in-line images
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,positioning}
\usetikzlibrary{calc,decorations.markings} 
\usepackage{mathpazo} % Use the Palatino font
\usepackage[T1]{fontenc}

\tikzstyle{error} = [circle, draw, fill=red!20, 
text width=4.0em, text badly centered, node distance=3cm, inner sep=0pt]
\tikzstyle{block} = [rectangle, draw, fill=blue!20, 
text width=5em, text centered, rounded corners, minimum height=4em]
\tikzstyle{line} = [draw, -latex']
\tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=3cm,
minimum height=2em]

\begin{document}

\begin{tikzpicture}[node distance = 2cm, auto]
% Place nodes

\node [block] (X1) {X1};
\node [block, below of=X1, node distance=3cm] (X2) {X2};
\node [block, below right = .25cm and 1.5cm of X1] (Y) {Y};
\node [error, right of = X1, node distance=3.7cm] (error) {error};
% Draw edges

\draw [latex-latex,in=135,out=225] (X1.west) to (X2.west);
%\path [line] (error) -- node {1}(X1);

\end{tikzpicture} 
\end{document}