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Tikz：如何更好地区分箭头与一个坐标？

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Tikz：如何更好地区分箭头与一个坐标？

我的 tikz 图片中有几个箭头指向同一个坐标。箭头看起来很丑。我想分别看到每个箭头。我该如何改善我的图片？

截屏

在此处输入图片描述

代码

\documentclass{article}    

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[scale=\linewidth/10cm]
% Help Lines
\draw[step=1,help lines,black!20] (-4.95,-2.95) grid (4.95,3.95);
% Ellipse
\draw[thick] (-2.5,0) ellipse [x radius=1.75, y radius=3];
\draw[thick] (2.5,0) ellipse [x radius=1.75, y radius=3];
% Text
\draw (-2.5,2) node (a) {-4};
\draw (-2.5,1) node (b) {-1,5};
\draw (-2.5,0) node (c) {0};
\draw (-2.5,-1) node (d) {3};
\draw (-2.5,-2) node (e) {7,25};
\draw (2.5,0) node (f) {3};
% Arrow
\draw[thick,->] (a) -- (f);
\draw[thick,->] (b) -- (f);
\draw[thick,->] (c) -- (f);
\draw[thick,->] (d) -- (f);
\draw[thick,->] (e) -- (f);
\end{tikzpicture}

\end{document}

答案1

三种不同的建议。i）缩短箭头，ii）改变端点，iii）弯曲箭头。

\documentclass{article}    

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[
  scale=\linewidth/10cm,
  myArrow/.style={thick,->,shorten >=10pt}]
% Help Lines
\draw[step=1,help lines,black!20] (-4.95,-2.95) grid (4.95,3.95);
% Ellipse
\draw[thick] (-2.5,0) ellipse [x radius=1.75, y radius=3];
\draw[thick] (2.5,0) ellipse [x radius=1.75, y radius=3];
% Text
\draw (-2.5,2) node (a) {-4};
\draw (-2.5,1) node (b) {-1,5};
\draw (-2.5,0) node (c) {0};
\draw (-2.5,-1) node (d) {3};
\draw (-2.5,-2) node (e) {7,25};
\draw (2.5,0) node (f) {3};
% Arrow
\draw[myArrow] (a) -- (f);
\draw[myArrow] (b) -- (f);
\draw[myArrow] (c) -- (f);
\draw[myArrow] (d) -- (f);
\draw[myArrow] (e) -- (f);
\end{tikzpicture}


\begin{tikzpicture}[
  scale=\linewidth/10cm,
  myArrow/.style={thick,->}]
% Help Lines
\draw[step=1,help lines,black!20] (-4.95,-2.95) grid (4.95,3.95);
% Ellipse
\draw[thick] (-2.5,0) ellipse [x radius=1.75, y radius=3];
\draw[thick] (2.5,0) ellipse [x radius=1.75, y radius=3];
% Text
\draw (-2.5,2) node (a) {-4};
\draw (-2.5,1) node (b) {-1,5};
\draw (-2.5,0) node (c) {0};
\draw (-2.5,-1) node (d) {3};
\draw (-2.5,-2) node (e) {7,25};
\draw (2.5,0) node (f) {3};
% Arrow
\draw[myArrow] (a) -- ([yshift=5pt]f.west);
\draw[myArrow] (b) -- ([yshift=2.4pt]f.west);
\draw[myArrow] (c) -- (f.west);
\draw[myArrow] (d) -- ([yshift=-2.5pt]f.west);
\draw[myArrow] (e) -- ([yshift=-5pt]f.west);
\end{tikzpicture}

\begin{tikzpicture}[
  scale=\linewidth/10cm,
  myArrow/.style={thick,->}]
% Help Lines
\draw[step=1,help lines,black!20] (-4.95,-2.95) grid (4.95,3.95);
% Ellipse
\draw[thick] (-2.5,0) ellipse [x radius=1.75, y radius=3];
\draw[thick] (2.5,0) ellipse [x radius=1.75, y radius=3];
% Text
\draw (-2.5,2) node (a) {-4};
\draw (-2.5,1) node (b) {-1,5};
\draw (-2.5,0) node (c) {0};
\draw (-2.5,-1) node (d) {3};
\draw (-2.5,-2) node (e) {7,25};
\draw (2.5,0) node (f) {3};
% Arrow
\draw[myArrow] (a) to[out=0,in=125] (f);
\draw[myArrow] (b) to[out=0,in=150] (f);
\draw[myArrow] (c) -- (f);
\draw[myArrow] (d) to[out=0,in=210] (f);
\draw[myArrow] (e) to[out=0,in=245] (f);
\end{tikzpicture}

\end{document}

答案2

这很容易，只需进行简单的计算。要执行此操作，我们需要库calc，我们还将利用锚点系统来确定箭头的终点。

您的箭头是有序的，并且都指向同一个节点，因此我们可以\foreach先用 a 来简化这一点，然后用它来计算终点坐标。如果您不理解某些内容，请随时发表评论。

输出

在此处输入图片描述

代码

\documentclass[margin=10pt]{standalone}
\usepackage{tikz}

\usetikzlibrary{calc}

\begin{document}
\begin{tikzpicture}%[scale=\linewidth/10cm]
% Help Lines
\draw[step=1,help lines,black!20] (-4.95,-2.95) grid (4.95,3.95);
% Ellipse
\draw[thick] (-2.5,0) ellipse [x radius=1.75, y radius=3];
\draw[thick] (2.5,0) ellipse [x radius=1.75, y radius=3];
% Text
\node (a) at (-2.5,2)  {-4};
\node (b) at (-2.5,1)  {-1,5};
\node (c) at (-2.5,0)  {0};
\node (d) at (-2.5,-1) {3};
\node (e) at (-2.5,-2) {7,25};
\node (f) at (2.5,0)   {3};

\foreach \lett [
    count=\x starting from 0, 
    evaluate=\x as \xx using ((\x*25)/100),
    ] in {a,b,c,d,e}{
    \draw[thick,->] (\lett) -- ($(f.north west)!\xx!(f.south west)$);
}
\end{tikzpicture}
\end{document}

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