大家好，如果有人能帮助我。我在乳胶中撰写研究论文，当我在乳胶中编译我的 pdf 时，它运行良好，但当我通过转换章节中的每个部分以论文格式编译它时，我收到此错误软件包 pgfkeys 错误：我不知道密钥“/tikz/drop shadow”，我将忽略它。也许你拼错了。。如果有人能帮忙的话。下面是我正在使用的包，我不知道哪个包是做什么用的，但我正在使用它。
\input preambles.tex
\usepackage{caption}
%\usepackage{amsmath}% for \new@ifnextchar
\usepackage{calc}
\usepackage{caption}
\captionsetup[table]{position=bottom}
%\usepackage{amsmath,amsfonts}
%\usepackage{latexsym}
\usepackage{float}
\restylefloat{table}
%\newtheorem{thm}{Theorem}
\usepackage{multirow}
\usepackage{pgf}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric, arrows}
%\usepackage[hidelinks]{hyperref}
\usepackage{epsfig}
\usepackage{amssymb}
%\usepackage{graphicx}
\usepackage{adjustbox}
%\newtheorem{lm}[thm]{Lemma}
%\newtheorem{cor}[thm]{Corollary}
\usepackage{amsmath,amsfonts}
\usepackage{latexsym}
\usepackage{epic,eepic}
\usepackage{multicol}
\usepackage{lipsum}% for dummy text
\usepackage{graphicx}
\usepackage{epic,eepic}
\usepackage{lipsum}% for dummy text
\usepackage{graphicx}
%\usepackage{setspace}
\usepackage[hidelinks]{hyperref}
\usepackage{hyperref}
\usepackage{indentfirst}
\usepackage{xcolor}
\usepackage[utf8]{inputenc} % Required for inputting international characters
\usepackage[T1]{fontenc} % Output font encoding for international characters
\usepackage{mathpazo} % Palatino font
\newcommand*{\blanks}[1][4em]{\rule{#1}{.4pt}}
\newcommand*{\blank}[1]{\blanks[\widthof{#1}]}
\usepackage{listings}
\usepackage{color}
%\newcommand{\hiddensection}[1]{\stepcounter{section}}
%\usepackage{amsthm}
\begin{document}
\def\aky{empty}
\pagestyle{empty}
%\pagenumbering{roman}
%\include{Titlepage1}
%\include{Page}
\include{Titlepage}
%\include{dedication}
\include{abstract}
\include{ACK}
%\include{ABS}
这是我的代码
\begin{figure}[h!]\label{flow}
\centering
\tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow, trapezium stretches=true]
\tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow, trapezium stretches=true]
\tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=2cm, minimum height=1cm, text centered, draw=black, fill=blue!30,trapezium stretches=true]
\tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=orange!30]
\tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
\tikzstyle{arrow} = [thick,->,>=stealth]
\tikzstyle{line} = [draw, -latex']
\begin{tikzpicture}[node distance=2cm, auto]
\begin{scope}[local bounding box=left]
\node (start) [startstop] {COVID\textbackslash Non-COVID data};
\node (in1) [io, below of=start] {Image preprocessing};
\node (pro1) [process, below of=in1] {Feature Extraction};
\node (in3) [process, below of=pro1] {Feature Selection};
%\node (pro2b) [process, right of=dec1, xshift=2cm] {};
\node (out1) [io, below of=in3] {Classifier};
\node (stop) [startstop, below of=out1] {Results};
\draw [arrow] (start) -- (in1);
\draw [arrow] (in1) -- (pro1);
\draw [arrow] (pro1) -- (in3);
\draw [arrow] (in3) -- (out1);
\draw [arrow] (out1) -- (stop);
\end{scope}
\draw[color=gray,thick](left.south west) rectangle (left.north east);
\node[anchor=north,font=\bfseries] at ([yshift=-2em]left.south) {Stage 1};
\begin{scope}[local bounding box=right,xshift=6cm]
\node (start) [startstop] {COVID\textbackslash Non-COVID data};
\node (in1) [io, below of=start] {Image preprocessing};
\node (pro1) [process, below of=in1] {Convert Images pixel values into CSV};
\node (in3) [process, below of=pro1] {Feature Selection};
%\node (pro2b) [process, right of=dec1, xshift=2cm] {};
\node (out1) [io, below of=in3] {Classifier};
\node (stop) [startstop, below of=out1] {Results};
\draw [arrow] (start) -- (in1);
\draw [arrow] (in1) -- (pro1);
\draw [arrow] (pro1) -- (in3);
\draw [arrow] (in3) -- (out1);
\draw [arrow] (out1) -- (stop);
% % % % % % % % % % % % % % % %
\end{scope}
\draw[color=gray,thick](right.south west) rectangle (right.north east);
\node[anchor=north,font=\bfseries] at ([yshift=-2em]right.south) {Stage 2 };
\end{tikzpicture}
%\caption{Flowchart of proposed pipeline}
\end{figure}
答案1
只需要调用阴影库即可。
我把你的例子（几乎）简化了：你应该清理所有这些包（有些被调用了两次）并使其正常工作：删除\input，添加\documentclass和\begin{document}
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{
arrows,
shadows,
shapes.geometric,}
\begin{document}
And this is my code
\begin{figure}[h!]\label{flow}
\centering
\tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow, trapezium stretches=true]
\tikzstyle{startstop} = [trapezium, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, drop shadow, trapezium stretches=true]
\tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=2cm, minimum height=1cm, text centered, draw=black, fill=blue!30,trapezium stretches=true]
\tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=orange!30]
\tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
\tikzstyle{arrow} = [thick,->,>=stealth]
\tikzstyle{line} = [draw, -latex']
\begin{tikzpicture}[node distance=2cm, auto]
\begin{scope}[local bounding box=left]
\node (start) [startstop] {COVID\textbackslash Non-COVID data};
\node (in1) [io, below of=start] {Image preprocessing};
\node (pro1) [process, below of=in1] {Feature Extraction};
\node (in3) [process, below of=pro1] {Feature Selection};
%\node (pro2b) [process, right of=dec1, xshift=2cm] {};
\node (out1) [io, below of=in3] {Classifier};
\node (stop) [startstop, below of=out1] {Results};
\draw [arrow] (start) -- (in1);
\draw [arrow] (in1) -- (pro1);
\draw [arrow] (pro1) -- (in3);
\draw [arrow] (in3) -- (out1);
\draw [arrow] (out1) -- (stop);
\end{scope}
\draw[color=gray,thick](left.south west) rectangle (left.north east);
\node[anchor=north,font=\bfseries] at ([yshift=-2em]left.south) {Stage 1};
\begin{scope}[local bounding box=right,xshift=6cm]
\node (start) [startstop] {COVID\textbackslash Non-COVID data};
\node (in1) [io, below of=start] {Image preprocessing};
\node (pro1) [process, below of=in1] {Convert Images pixel values into CSV};
\node (in3) [process, below of=pro1] {Feature Selection};
%\node (pro2b) [process, right of=dec1, xshift=2cm] {};
\node (out1) [io, below of=in3] {Classifier};
\node (stop) [startstop, below of=out1] {Results};
\draw [arrow] (start) -- (in1);
\draw [arrow] (in1) -- (pro1);
\draw [arrow] (pro1) -- (in3);
\draw [arrow] (in3) -- (out1);
\draw [arrow] (out1) -- (stop);
% % % % % % % % % % % % % % % %
\end{scope}
\draw[color=gray,thick](right.south west) rectangle (right.north east);
\node[anchor=north,font=\bfseries] at ([yshift=-2em]right.south) {Stage 2 };
\end{tikzpicture}
%\caption{Flowchart of proposed pipeline}
\end{figure}
\end{document}
