In LaTeX, how can I place text over an imported graphics object? [closed]

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I have an image in the eps format that I want to include in my document. The image contains only the geometry of the object; it does not contain the necessary text. It has some ar开发者_如何学编程rows, and I'd like to add the text in LaTeX so the labels (which include math) look clean.

How can I place an equation at a particular location over an imported figure?

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You can use pgfonlayer and tikz. It is a bit complicated, but here is an example I have from a beamer presentation:

 \pgfdeclarelayer{foreground}
 \pgfdeclarelayer{background}
 \pgfsetlayers{background,main,foreground}
 \begin{tikzpicture}
 \begin{pgfonlayer}{foreground}
      \path  (1.0,2.0) node (c) {{\color{blue} Some info...}}
         (1.0,1.5) node (b) {{\color{blue}... which is cool!}};
 \end{pgfonlayer}
 \begin{pgfonlayer}{background}
   \path      (0,0) node (o) {
      \includegraphics[width=\textwidth]{./figures/somefigure.eps}};
 \end{pgfonlayer}
 \end{tikzpicture}

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Look at the overpic package by Rolf Niepraschk: http://www.ctan.org/pkg/overpic It combines includegraphics (graphicx package) and a picture environment. It is very easy to use!

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The psfrag package enables you to splice arbitrary LaTeX, including math, in place of text appearing in a .eps file. I find it indispensable.

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You might want to look into the textpos package. See here

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I decided to just attempt to use \rput(x,y){text}, and it worked after some trial and error with the coordinates. This is working for now but I'm still interested if someone has a better way. :)