On 2022-05-29 21:16, Apostolos Syropoulos via XeTeX wrote:

[...] The two files differ as follows:

28,29c28,29
<     \node[inner sep=0pt] (light) at (1,2.1)
<     {\includegraphics[scale=0.1]{TRAIN-crop.pdf}};
---
     \node[inner sep=0pt] (light) at (5.2,3.5)
     {\includegraphics[scale=0.1,angle=45]{TRAIN-crop.pdf}};
>
The question is why do I get different paper sizes?

You know that the size of the second \includegraphics with angle=45
is different?

The size of the second \includegraphics is a *square*. If w1 and h1
are the width and height of the first \includegraphics, then
the width w2 and h2 of the second \includegraphics with angle=45 are:

  w2 = h2 = sqrt(1/2) * (w1 + h1)

or
  w2 + h2
  ------- = sqrt(2) ≈ 1.4142
  w1 + h1

Yours sincerely
  Heiko

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