43. LaTeX技巧613：LaTeX在插图上绘制标志

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看图说话：

选自：http://tex.stackexchange.com/questions/9559/drawing-on-an-image-with-tikz

节选代码：

\documentclass{article}



\def\M{4}% columns

\def\N{4}% rows

\def\scale{0.25}% scale

\def\filename{mycena_interrupta}% filename





\usepackage{graphicx}

\newsavebox\IBox

\savebox\IBox{\includegraphics[scale=\scale]{\filename}}





\usepackage{pstricks}

\newpsstyle{gridstyle}

{

    gridcolor=red!25,

    subgridcolor=cyan!25,

    gridwidth=0.4pt,

    subgridwidth=0.2pt,

}



\psset

{

   xunit=0.5\dimexpr\wd\IBox/\M\relax,

   yunit=0.5\dimexpr\ht\IBox/\N\relax,

   style=gridstyle,

}





\usepackage[active,tightpage]{preview}

\PreviewBorder=12pt

\PreviewEnvironment{pspicture}



\begin{document}

\begin{pspicture}[showgrid=false](-\M,-\N)(\M,\N)

    \rput(0,0){\usebox\IBox}

    \psframe[linecolor=red,linewidth=2pt,dimen=inner,framearc=0.5](0.9,1.2)(2.2,2)

\end{pspicture}

\end{document}