Just launch it, click on point A, click on point B and enjoy the results.
![Wink ;)](./images/smilies/icon_wink.gif)
You'll get coordinates of A & B points, a distance between them in pixels, centimeters and inches, and additionally a distance relative to X and Y axes.
Requirements: bash, xwininfo, xrandr, getcurpos, awk, which (g)xmessage
EDIT: attached also measur3r_lite, which supports only pixel units, not cm/in.
For those for whom the regular version can not read the physical display size and who are unable to determine that size by themselves (or just don't need/care about cm/in).
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Changelog:
Version 1.1
- a warning window in case if obtaining the physical size of the display has failed (thanks to Jasper & mister_electronico)
- physical size of the display can be also defined manually in $HOME/.measur3r
Version 1.2
- fix in calculations for screens that have width smaller than height (thanks to MochiMoppel)
Version 1.3
- added 'Repeat' button (thanks to charlie6)
- better compatibility with _real_ xmessage
Have fun &
Greetings!