此图表示训练用的加速包和一些其他节点。但是，编译时生成的 PDF 底部有一个空白区域：
\documentclass[border=2mm]{standalone}
\usepackage {tikz}
\usepackage {siunitx} % SI units, \SI and \ang commands
\usetikzlibrary{3d}
\usetikzlibrary{babel} % There are issues with some babel packages
\usetikzlibrary{calc} % Computing some coordinates
\usepackage{xcolor}
\usetikzlibrary{patterns}
\usetikzlibrary{patterns.meta}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{decorations.pathreplacing}
\begin{document}
\begin{tikzpicture}[
pics/hook/.style={code={
\pgfgettransformentries{\tmpa}{\tmpb}{\tmpc}{\tmpd}{\tmp}{\tmp}%
\pgfmathsetmacro{\myJacobian}{sqrt(abs(\tmpa*\tmpd-\tmpb*\tmpc))}
\draw[line width=\myJacobian*12pt,line cap=round]
(0,-1) -- (0,-0.6) to[out=90,in=0] (-0.1,-0.5)
arc[start angle=250,end angle=0,radius=0.5cm];
}},
pics/bar/.style={code={\pgfgettransformentries{\tmpa}{\tmpb}{\tmpc}{\tmpd}{\tmp}{\tmp}%
\pgfmathsetmacro{\myJacobian}{sqrt(abs(\tmpa*\tmpd-\tmpb*\tmpc))}
\draw[top color=black!65,
bottom color=black!70,
middle color=cyan!30,
vertical custom shading=35, rounded corners=1pt, line width=\myJacobian*2pt]
(-0.25,-1.5) rectangle (0.25,1.5);
\draw [fill=black] (0,0) circle[radius=1mm];}},line cap=round,>=stealth,
declare function={alpha=15;}
]
\def\xR{20pt}; %x radius of ellipse
\def\yR{5pt}; %y radius of ellipse
\def\d0{4cm}; % initial distance
\newcommand*{\ArcAngle}{-160}%
\newcommand*{\ArcRadius}{0.7}%
\coordinate (Origin) at (0,-0.1);
% ceiling
\fill [
pattern={Lines[
distance=1.5mm,
angle=45,
line width=0.3mm
]},
pattern color=gray
] (-2.5,0) rectangle (2.5,.3);
\draw [very thick] (-2.5, 0) -- (2.5, 0);
% speedbag
\begin{scope}[shift={(0,-2.2)}]
% speedbag
\coordinate (a) at (0,2.); % Change 1.5 to change the shape of the droplet
\node [circle,draw,fill=blue!30!white, blue!30!white, opacity=1] (c) at (0,0) [minimum size=40pt] {};
\draw[blue!30!white,fill=blue!30!white, opacity=1] (a) -- (tangent cs:node=c,point={(a)},solution=1) --
(c.center) -- (tangent cs:node=c,point={(a)},solution=2) -- cycle;
\draw [dashed] (-\xR,0) arc[start angle=180,end angle=0,x radius=\xR,y radius=\yR]; %top half
\draw (-\xR,0) arc[start angle=180,end angle=360,x radius=\xR,y radius=\yR]; %bottom half
\draw[black, very thin] (0,0) --++ (\xR,0) node[pos=0.5, above] {\footnotesize h};
\draw[black, very thin] (0,0) --++ (0,2) node[pos=0.5, left] {\footnotesize l};
% TAG
\draw[line width=.7ex,red!70, {Butt Cap[red!70]}-{Butt Cap[red!70]}, xshift=(\xR+.15), align=left] (0,-0.15) -- (0,0.15)
node[right, pos=0.5, black] (TLAB) {};
\begin{scope}[rotate around={50:(a)}]
\coordinate (A) at (0,2.); % Change 1.5 to change the shape of the droplet
\node [circle,draw,fill=blue!10!white, blue!10!white, opacity=1] (C) at (0,0) [minimum size=40pt] {};
\draw[blue!10!white,fill=blue!10!white, opacity=1] (A) -- (tangent cs:node=C,point={(A)},solution=1) --
(C.center) -- (tangent cs:node=C,point={(A)},solution=2) -- cycle;
%ELIPSE
\draw [dashed,black!60!white] (-\xR,0) arc[start angle=180,end angle=0,x radius=\xR,y radius=\yR]; %top half
\draw [black!60!white] (-\xR,0) arc[start angle=180,end angle=360,x radius=\xR,y radius=\yR];
%TAG
\draw[line width=.7ex,red!50, {Butt Cap[red!50]}-{Butt Cap[red!50]}, xshift=(\xR+.15), align=left] (0,-0.15) -- (0,0.15);
\end{scope}
\begin{scope}[rotate around={-60:(a)}]
\coordinate (AA) at (0,2.); % Change 1.5 to change the shape of the droplet
\node [circle,draw,fill=blue!10!white, blue!10!white, opacity=1] (CC) at (0,0) [minimum size=40pt] {};
\draw[blue!10!white,fill=blue!10!white, opacity=1] (AA) -- (tangent cs:node=CC,point={(AA)},solution=1) --
(CC.center) -- (tangent cs:node=CC,point={(AA)},solution=2) -- cycle;
%ELIPSE
\draw [dashed, black!60!white] (-\xR,0) arc[start angle=180,end angle=0,x radius=\xR,y radius=\yR]; %top half
\draw [black!60!white] (-\xR,0) arc[start angle=180,end angle=360,x radius=\xR,y radius=\yR];
%TAG
\draw[line width=.7ex,red!50, {Butt Cap[red!50]}-{Butt Cap[red!50]}, xshift=(\xR+.15), align=left] (0,-0.15) -- (0,0.15);
\end{scope}
% hook
\path (0.7,0) ++ (alpha:0.7) -- ++ (alpha-90:2.5) coordinate (H1)
(0,2) pic[scale=0.2,gray,rotate=180]{hook};
\end{scope}
% ARC MOV
\draw [<->, dashed] ($(Origin)+(\ArcRadius,0)$) arc (0:\ArcAngle:\ArcRadius);
% INITIAL ANTENNa
\begin{scope}[shift={(0,-2.2)}] % Reader
\draw[line width=.85ex,red!70, {Butt Cap[red!70]}-{Butt Cap[red!70]}, xshift=(\d0), align=left] (0,-0.35) -- (0,0.35)
node[above, align=left, black] (READ) {}
node[pos=.5] (READ) {};
% WAVES
\draw[decoration={expanding waves,angle=25},decorate] ($(READ) + (0.1,0)$) --++ (-1.8,0);
\end{scope}
\end{tikzpicture}
\end{document}
我想将框架调整到方案中所代表的对象。
答案1
图像的边界框由绘制图片时使用的所有坐标的位置决定。如果边界框太大（有多余的空白），则您必须手动设置边界框（\useasboundingbox），或者必须更正绘图（如果有不必要的命令导致问题）。
您的tikzpicture包含行
% hook
\path (0.7,0) ++ (alpha:0.7) -- ++ (alpha-90:2.5) coordinate (H1)
(0,2) pic[scale=0.2,gray,rotate=180]{hook};
第一部分\path定义坐标H1。它无处可用，但位于图片底部，即空白区域的底部。此坐标是额外空间的原因。
将此代码替换为
% hook
\path (0,2) pic[scale=0.2,gray,rotate=180]{hook};