xwatermark 與考試類別之間的衝突

Question

我想透過以下方式在課堂上列印浮水印，exam因為我不希望水印出現在前景中並且具有一定的不透明度。一旦我取消註解它\usepackage[printwatermark]{xwatermark}就會出現錯誤：

! LaTeX Error: Command \lhead already defined.
! LaTeX Error: Command \chead already defined.
! LaTeX Error: Command \rhead already defined.
! LaTeX Error: Command \lfoot already defined.
! LaTeX Error: Command \cfoot already defined.
! LaTeX Error: Command \lfoot already defined.
! LaTeX Error: Command \rhead already defined.

有人可以幫我嗎？

\documentclass{exam}
\usepackage[english]{babel}
\usepackage{tikz}

\usepackage[printwatermark]{xwatermark}
\newsavebox\mybox
\savebox\mybox{\tikz[opacity=0.1]\node{Sankhya};}
%\newwatermark*[
%  allpages,
% angle=60,
%  scale=12,
%  xpos=-30,
%  ypos=15
%]{\usebox\mybox}

\begin{document}

\begin{questions}

\question This is my first Question.

\question This is my second question

\end{questions}

\end{document}

Answer 1

我擔心xwatermark和exam.cls確實不相容（除非發生大量重新定義）

我轉而使用background也可用於浮水印等的包。應用placement=或position=...選項來\backgroundsetup移動浮水印。

\documentclass{exam}
\usepackage[english]{babel}
\usepackage{tikz}
\usepackage{background}
\newsavebox\mybox
\savebox\mybox{\tikz[opacity=0.4]\node{Sankhya};}

\backgroundsetup{angle=60,contents={\usebox\mybox}}

\begin{document}

\begin{questions}

\question This is my first Question.

\question This is my second question

\end{questions}

\end{document}