[issue34918] Python 3 tkinter measurement problem

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This is a Tk issue. Tkinter returns the same result as a plain Tk 
(unsurprisingly).

$ rlwrap wish
% winfo screenmmwidth .
1016
% winfo screenwidth .
3840
% puts [expr "25.4*[winfo screenwidth .]/[winfo screenmmwidth .]"]
96.0

--
resolution:  -> third party
stage:  -> resolved
status: open -> closed

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[issue34918] Python 3 tkinter measurement problem

[Terry J. Reedy]

Terry J. Reedy  added the comment:

I cannot reproduce 'too large'.  My screen in 340 mm high.  It is reported as 
305 in console Python 3.7.1rc1 and in IDLE run normally and with -n (no 
subprocess) and in console Python 3.6.7.  The point of trying '-n' is to run 
the test code in the IDLE process, which now makes a DPIAwareness call.  I am 
fairly sure that my console does not. 

In any case, tkinter interfaces to tcl/tk via _tkinter.  Unless it can be shown 
that _tkinter distorts the value returned by tk, I think this should be closed 
as '3rd party'.

--
nosy: +serhiy.storchaka, terry.reedy
versions: +Python 3.7, Python 3.8

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[issue34918] Python 3 tkinter measurement problem

[Adrian Keister]

New submission from Adrian Keister :

tkinter.Tk().winfo_screenmmwidth() and tkinter.Tk().winfo_screenmmheight() give 
manifestly incorrect values in Windows. This does not appear to be an issue in 
Linux. I have not tested a Mac. The values reported in Windows are too large by 
as much as 58%. Searching online seems to indicate that the issue is some 
applications in Windows are "dpi aware"; unfortunately, none of the so-called 
work-arounds I've found actually fix the problem. The 
tkinter.Tk().winfo_screenwidth() and tkinter.Tk().winfo_screenheight() 
functions, reporting their results in pixels, appear to be correct. A MWE is 
simply

import tkinter
tkinter.Tk().winfo_screenmmwidth()

This reports a 508 mm on my 15.6" screen, when the true value is closer to 343 
mm. This is a 48% error, and hence an unusable result. 

Thank you for your time!

--
components: Tkinter
messages: 327265
nosy: Ackbach
priority: normal
severity: normal
status: open
title: Python 3 tkinter measurement problem
type: behavior
versions: Python 3.6

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