How to compose a fixed-size image from multiple eps files

Question

I am looking for a way to build an image by overlaying a large .eps file (A.eps) with a smaller inset (B.eps). I want the final image area to have a fixed dimensions (width=\textwidth, height=10cm).

First, A.eps needs to be scaled to the image area width (i.e. \textwidth) and positioned vertically at the bottom of the image area. The original aspect ratio of A.eps must be preserved. If the height of the scaled A.eps is less than the image area height, I want the whitespace above it preserved. If it is greater, then I want the A.eps clipped back to the top of the image area.

Second, I want to inset a much smaller graphic B.eps (without scaling) positioned so that the northeast corner of B.eps is 0.5cm south and 0.5cm to the west of the northeast corner of the image area.

Lastly, I want to do this for many files where the aspect ratio of both A.eps and B.eps change. Ideally, I want to define a command and feed the names of the images as arguments.

Ideas?

Answer 1

It is probably possible to do this without TikZ, but it is quite easy with TikZ:

\documentclass{article}
\usepackage{tikz} % tikz loads graphix

\newcommand\doubleimage[2]{%
\begin{tikzpicture}
\clip (0,0) rectangle (\textwidth,10cm);
\node [above right,inner sep=0pt,outer sep=0pt] at (0,0)
  {\includegraphics[width=\textwidth]{#1}};

% Remove [width=1cm] below, it is there just to scale the images used in the example
\node [below left,inner sep=0pt,outer sep=0pt] at ([shift={(-0.5cm,-0.5cm)}]\textwidth,10cm)
  {\includegraphics[width=1cm]{#2}};


% the following line is just to show the extent of the image area, it can be removed
\draw [red,thick](current bounding box.south east) rectangle (current bounding box.north west);
\end{tikzpicture}}

% adjust margins just to fit both examples on same page
% just for sake of example, of course
\usepackage[vmargin=2cm,hmargin=5cm]{geometry}

\begin{document}
\noindent\doubleimage{example-image-16x10}{example-image-a}

\vspace{1cm}

\noindent\doubleimage{example-image-10x16}{example-image-b}
\end{document}