如何定位 XY-pic 封裝圖

Question

我有這個基本的 XY-pic 套件繪製

\begin{displaymath}
    \xymatrix{A & B \\
              C & D }
\end{displaymath}

當我在 Latex 中輸入程式碼時，它會將其繪製在頁面的中心。我如何才能按照我想要的方式準確定位此繪圖？

PS 另外，如何將任何繪圖放入乳膠盒中？

Answer 1

嘗試

 \documentclass{amsart}
 \usepackage{tikz}
 \usepackage{graphicx}
 \usetikzlibrary{calc}
 \usepackage[all]{xy}
 \begin{document}
 \hfill{}This matrix \fbox{\xymatrix{A & B \\ C & D }} is off to the right.
 \begin{center}
 This matrix \fbox{\xymatrix{A & B \\ C & D }} is centered.
 \end{center}
 \par\noindent{}This one \fbox{\xymatrix{A & B \\ C & D }} is on the left.
 \begin{tikzpicture}[remember picture,overlay]
   \node[anchor=south west,inner sep=0pt] at ($(current page.south west)+(0cm,0cm)$) {
      \fbox{\xymatrix{A & B \\ C & D }}
   };
   \node[anchor=south east,inner sep=0pt] at ($(current page.south east)+(0cm,0cm)$) {
      \fbox{\xymatrix{A & B \\ C & D }}
   };
   \node[anchor=north west,inner sep=0pt] at ($(current page.north west)+(0cm,0cm)$) {
      \fbox{\xymatrix{A & B \\ C & D }}
   };
   \node[anchor=north east,inner sep=0pt] at ($(current page.north east)+(0cm,0cm)$) {
      \fbox{\xymatrix{A & B \\ C & D }}
   };
 \end{tikzpicture}
 \end{document}

這會導致輸出如下：