我的图表目前很大，我想缩小它。
\documentclass[a4paper,12p]{report}
\usepackage{tikz}
\usepackage{graphicx}
\begin{document}
\begin{figure}
\begin{center}
\begin{tikzpicture}[rounded corners,ultra thick]
circles
\shade[ball color=green] (0,0) circle (.5cm);
\shade[ball color=blue] (-4,4) circle (.5cm);
\shade[ball color=yellow] (0,4) circle (.5cm);
\shade[ball color=red] (4,4) circle (.5cm);
\shade[ball color=cyan] (-2,-4) circle (.5cm);
\shade[ball color=orange] (2,-4) circle (.5cm);
\draw (0,0) node[minimum size=2cm] {$A_e$};
\draw (0,4) node[minimum size=2cm] {$I_m$};
\draw (4,4) node[minimum size=2cm] {$I_s$};
\draw (-4,4) node[minimum size=2cm] {$S$};
\draw (-2,-4) node[minimum size=2cm] {$P_s$};
\draw (2,-4) node[minimum size=2cm] {$P_I$};
\draw[->] (-5.5,4) -- (-4.5,4);
\draw[->] (-3.5,4) -- (-0.5,4);
\draw[->] (0.5,4) -- (3.5,4);
\draw[->] (-4,4.5) -- (-4,5.5);
\draw[->] (0,4.5) -- (0,6);
\draw[->] (4.2,4.4) -- (4.8,5.5);
\draw[->] (4.5,4) -- (5.5,4);
\draw[->] (0.4,0) -- (1.3,0);
\draw[->] (1,-1.5) -- (0,-0.4);
\draw[->] (-3.5,-4) -- (-2.5,-4);
\draw[->] (-1.8,-4.4) -- (-3,-5);
\draw[->] (-1.5,-4) -- (1.5,-4);
\draw[->] (2.5,-4) -- (3.5,-4);
\draw[<-, dashed] (-3.8,3.5) -- (2,-3.5);
\draw[->, dashed] (-0.3,-0.4) -- (-1.8,-3.7);
\node at (-5,4.3) {$\pi$};
\node at (-4.1,6) {$\mu S$};
\node at (-2.5,4.3) {$\beta_h P_IS$};
\node at (5,5.8) {$\delta I_s$};
\node at (5.9,4) {$\mu I_s$};
\node at (1.8,0) {$\phi A_e$};
\node at (0,6.5) {$\mu I_m$};
\node at (2,4.3) {$\sigma I_m$};
\node at (1.5,-2) {$\epsilon P_I$};
\node at (-3,-3.6) {$\theta P_N$};
\node at (-3.5,-5.3) {$\theta Ps$};
\node at (-0.2,-3.6) {$\beta_p(P_I+\gamma A_e)P_s$};
\node at (2.9,-3.6) {$\theta P_I$};
\end{tikzpicture}
\caption{Model Diagram for HPAI dynamics}\label{fig:1}
\end{center}
\end{figure}
\end{document}
答案1
我会重绘图像 :)。在此我会改变：
- 球的定位（我会使用相对定位而不是绝对定位）
- 用球阴影定义节点
- 用于
quotes边缘标记 - 使用字体大小
\small
除此之外，代码更加简洁，现在可以通过改变字体大小来改变图像node distance大小（如果需要）：
\documentclass[a4paper,12p]{report}
\usepackage{tikz}
\usetikzlibrary{arrows.meta, positioning, quotes}
%-------------------------------------- only for show page layout
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.25pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[
node distance = 11mm and 33mm,
font = \small,
Ball/.style = {circle, shading=ball,
ball color=#1,
minimum size=7mm, inner sep=1pt},
LA/.style = {thick, -Straight Barb},
every edge quotes/.append style = {inner sep=1pt}
]
\node (n11) [Ball=blue] {$S$};
\node (n12) [Ball=yellow,right=of n11] {$I_m$};
\node (n13) [Ball=red,right=of n12] {$I_s$};
%
\node (n21) [Ball=green,below=of n12] {$A_e$};
%
\node (n31) [Ball=cyan,below left=of n21] {$P_s$};
\node (n32) [Ball=orange, right=of n31] {$P_I$};
%
\draw[LA]
([xshift=-13mm] n11.west) edge ["$\pi$"] (n11)
(n11) edge ["$\mu I_s$"] + (0,13mm)
(n11) edge ["$\beta_h P_IS$"] (n12)
(n12) edge ["$\delta I_s$"] (n13)
(n12) edge ["$\mu I_m$"] + (0,13mm)
(n13) edge ["$\mu I_s$"] + (45:13mm)
(n13) edge ["$\mu S$"] + (13mm,0)
%
(n21) edge ["$\phi A_e$"] + (13mm,0)
(n21) + (-45:13mm) edge ["$\epsilon P_I$"] (n21)
%
([xshift=-13mm] n31.west) edge ["$\theta P_N$"] (n31)
(n31) edge ["$\theta P_s$"] + (-45:13mm)
(n31) edge ["$\beta_p(P_I+\gamma A_e)P_s$"] (n32)
(n32) to ["$\theta P_I$"] + (13mm,0)
;
\draw[LA, dashed] (n11) edge (n32)
(n21) -- (n31);
\end{tikzpicture}
\caption{Model Diagram for HPAI dynamics}\label{fig:1}
\end{figure}
\end{document}
注意：红线表示文档文本宽度。
答案2
这最懒惰选项是使用\resizebox{\linewidth}{!}{<content>}。它很丑，而且会使字体变小，但却是获得结果的最快方法。