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Message-ID:  <20150126095517.GA2833@hzdr.de>
Date:         Mon, 26 Jan 2015 10:55:17 +0100
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From: Alexander Grahn <A.Grahn@HZDR.DE>
Subject: \box_resize_to_ht:Nn (bug report)
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
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Envelope-To: <rainer.schoepf@GMX.NET>
Status: R

Good morning,

I have just noticed that \box_resize_to_ht:Nn forces the given box
into a square instead of scaling the width appropriately. The other,
\box_resize_to_wd:Nn works as expected as it preserves the original
aspect ratio:

  \documentclass{article}
  \usepackage{expl3}
  \usepackage{graphicx}
  \usepackage{mwe}
  
  \begin{document}
  \newsavebox\picbox
  \savebox\picbox{\includegraphics{example-image-a}}
  
  \typeout{orig. size: \the\wd\picbox\space X \the\ht\picbox}
  
  \ExplSyntaxOn
  \box_resize_to_ht:Nn\picbox{60pt}
  \ExplSyntaxOff
  \typeout{\string\box_resize_to_ht:Nn \the\wd\picbox\space X \the\ht\picbox}
  
  \savebox\picbox{\includegraphics{example-image-a}}
  \ExplSyntaxOn
  \box_resize_to_wd:Nn\picbox{60pt}
  \ExplSyntaxOff
  \typeout{\string\box_resize_to_wd:Nn \the\wd\picbox\space X \the\ht\picbox}
  
  \end{document}

Kind regards,
Alexander