docs: add pgfplots example (#998)

assets/energy-distrib.csv

@@ -0,0 +1,67 @@
+radial,energy
+0.181,6.6900E-03
+0.532,1.2004E-01
+0.865,6.2542E-01
+1.18,2.0861E+00
+1.48,5.5475E+00
+1.76,1.2735E+01
+2.02,2.6185E+01
+2.27,4.9240E+01
+2.51,8.5867E+01
+2.73,1.4031E+02
+2.94,2.1660E+02
+3.14,3.1815E+02
+3.33,4.4733E+02
+3.51,6.0533E+02
+3.68,7.9218E+02
+3.83,1.0069E+03
+3.98,1.2706E+03
+4.13,1.5886E+03
+4.26,1.9344E+03
+4.39,2.3028E+03
+4.51,2.6876E+03
+4.62,3.0824E+03
+4.73,3.4803E+03
+4.83,3.8730E+03
+4.92,4.2502E+03
+5.01,4.6567E+03
+5.10,5.1085E+03
+5.18,5.5620E+03
+5.25,6.0060E+03
+5.33,6.4320E+03
+5.39,6.8350E+03
+5.46,7.2112E+03
+5.52,7.5566E+03
+5.58,7.9015E+03
+5.63,8.2540E+03
+5.68,8.5858E+03
+5.73,8.8873E+03
+5.77,9.1404E+03
+5.82,9.3077E+03
+5.86,9.3189E+03
+5.90,9.0676E+03
+5.93,8.5082E+03
+5.97,7.5684E+03
+6.00,6.6227E+03
+6.03,5.7336E+03
+6.06,4.9303E+03
+6.09,4.2094E+03
+6.11,3.5665E+03
+6.14,2.9973E+03
+6.16,2.4969E+03
+6.18,2.0604E+03
+6.20,1.6826E+03
+6.22,1.3579E+03
+6.24,1.0813E+03
+6.26,8.4809E+02
+6.27,6.5369E+02
+6.29,4.9369E+02
+6.30,3.6385E+02
+6.32,2.6020E+02
+6.33,1.7908E+02
+6.34,1.1713E+02
+6.35,7.1338E+01
+6.37,3.9001E+01
+6.38,1.7739E+01
+6.39,5.4680E+00
+6.40,3.8068E-01

contents/floats.tex

@@ -15,19 +15,39 @@ \section{插图}
 \subsection{单个图形}
 
 图要有图题，研究生图题采用中英文对照，并置于图的编号之后，图的编号和图题应置于图
-下方的居中位置。引用图应在图题右上角标出文献来源。当插图中组成部件由数字或字母等
-编号表示时，可在插图下方添加图注进行说明，如图~\ref{fig:cn_100t} 所示。
+下方的居中位置。引用图应在图题右上角标出文献来源。文中必须有关于本插图的提示，如
+“见图~\ref{fig:energy-distrib}”、“如图~\ref{fig:energy-distrib} 所示”等。该页空
+白不够排写该图整体时，则可将其后文字部分提前排写，将图移到次页。
 
 \begin{figure}[!htp]
   \centering
-  \includegraphics[width=4cm]{cn_100t.png} \\
-    1.立柱 2.提升释放机构 3.标准冲击加速度计 \\
-    4.导轨 5.重锤 6.被校力传感器 7.底座 \\
-  \bicaption[出现在插图索引中]
-    {单个图形示例\cite{He1999}。如果表格的标题很长，那么在表格索引中就会很不美观。可
-      以在前面用中括号写一个简短的标题，这个标题会出现在索引中。}
-    {Stay hungry, stay foolish.}
-  \label{fig:cn_100t}
+  \begin{tikzpicture}
+    \begin{axis}[
+      width=12cm,
+      height=9cm,
+      xmin=0, xmax=7,
+      xlabel={$r$ (\unit{\milli\metre})},
+      ymin=-1000, ymax=11000,
+      ylabel={Energy (\unit[per-mode=symbol]{\watt\per\cubic\metre})},
+      scaled ticks=false,
+      tick label style={
+        /pgf/number format/1000 sep=,
+        font={\zihao{-5}},
+      },
+      minor tick num=1,
+      tick pos=left,
+      tick align=outside,
+      tick style={thin,black},
+    ]
+      \addplot [only marks,mark=square*] 
+        table [x={radial}, y={energy}, col sep=comma] 
+        {./assets/energy-distrib.csv};
+      \node at (2,6000) 
+        {$q_{v}=\dfrac{\sigma\omega^{2}|\mathbf{A}|^{2}}{2}$};
+    \end{axis}
+  \end{tikzpicture}
+  \bicaption{内热源沿径向的分布}{Energy distribution along radial}
+  \label{fig:energy-distrib}
 \end{figure}
 
 \subsection{多个图形}

refs.bib

@@ -193,13 +193,4 @@ @standard{GBT16159
   year      = {1996}
 }
 
-@article{He1999,
-  author  = {何闻},
-  title   = {标准动态力发生装置国内外研究现状},
-  journal = {机电工程},
-  year    = {1999},
-  number  = {2},
-  pages   = {47--49}
-}
-
 @Comment{jabref-meta: databaseType:biblatex;}

setup.tex

@@ -195,6 +195,10 @@
 \usepackage{tikz}
 \usetikzlibrary{arrows.meta, shapes.geometric}
 
+% 数据图表宏包
+\usepackage{pgfplots}
+\pgfplotsset{compat=newest}
+
 % 一些文档中用到的 logo
 \usepackage{hologo}
 \providecommand{\XeTeX}{\hologo{XeTeX}}