From klappnase at web.de  Fri Jul  2 03:23:37 2021
From: klappnase at web.de (Michael Lange)
Date: Fri, 2 Jul 2021 09:23:37 +0200
Subject: [Tkinter-discuss] Trying to center the output of
 Canvas.postscript() onto A4 page
Message-ID: <20210702092337.bce210daf73f1c7893e0b24f@web.de>

Hi,

I want to print the contents of a Canvas widget by feeding the output of
the postscript() command to lpr (I am working with linux here).

I would like that Canvas "screenshot" to be centered on the printed page
(in my case these are A4 pages which are standard here).
Unfortunately I do not seem to be able to do this. After a number of
unsuccessful tries to fiddle with lpr I finally found that the problem
appears to be that the generated postscript file always seems to be
designed for pages in U.S. letter format, obviously this part in the
postscript:

%%Page: 1 1
save
306.0 396.0 translate

is responsible for that; I tried and manually changed the coords that (as
it seems) are passed to the "translate" command and the position of the
Canvas rectangle (which might be for example 12x12 cm or so) on the page
changes.

So, is there any way to tell the postscript() command to use a page size
other than U.S. letter for its output that I missed, or alternatively,
does anyone know about a 3rd party tool available for linux that could be
used to "convert" the postscript() output from letter to A4 format?

Thanks in advance

Michael


.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

	"Get back to your stations!"
	"We're beaming down to the planet, sir."
		-- Kirk and Mr. Leslie, "This Side of Paradise",
		   stardate 3417.3

From paul at tartan.co.za  Fri Jul  2 04:14:10 2021
From: paul at tartan.co.za (Paul Malherbe)
Date: Fri, 2 Jul 2021 10:14:10 +0200
Subject: [Tkinter-discuss] Trying to center the output of
 Canvas.postscript() onto A4 page
In-Reply-To: <20210702092337.bce210daf73f1c7893e0b24f@web.de>
References: <20210702092337.bce210daf73f1c7893e0b24f@web.de>
Message-ID: <b790b8cd-ce77-6ed4-63ae-7f15df75c2ea@tartan.co.za>

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From klappnase at web.de  Fri Jul  2 11:58:39 2021
From: klappnase at web.de (Michael Lange)
Date: Fri, 2 Jul 2021 17:58:39 +0200
Subject: [Tkinter-discuss] [Solved] Re: Trying to center the output of
 Canvas.postscript() onto A4 page
In-Reply-To: <CAKmRqbY8V6YPyqd=1g7wOzemBT4ccPOU5MWJks7fuAidgOxReQ@mail.gmail.com>
References: <20210702092337.bce210daf73f1c7893e0b24f@web.de>
 <CAKmRqbY8V6YPyqd=1g7wOzemBT4ccPOU5MWJks7fuAidgOxReQ@mail.gmail.com>
Message-ID: <20210702175839.cda5d70b037796c8bfa7bb83@web.de>

Hi,

thanks for the feedback!

On Fri, 2 Jul 2021 09:17:41 -0300
Emiliano Gavilan <emilianogavilan at gmail.com> wrote:

> You can achieve what you want with the correct set of options to the
> canvas postscript() method, documented here:
>
> https://www.tcl.tk/man/tcl8.6/TkCmd/canvas.html#M61

yes, I have been looking at that man page the other day for what felt
like an hour, but failed to get the point :-)
Well, maybe at least I can partially blame that failure on the man page
authors, since there is nothing mentioned that the default values are
apparently pagex=306.0, pagey=396.0 which appears to be half the size of a
page in U.S. letter format measured in printer points. This sort of
information might have helped :-)

>
> In your case:
>
> canvas.postscript(pagex=0, pagey=0, pagewidth=594, pageheight=841,
> pageanchor="sw", file="test.eps")
>
> This will scale the output to fit into an A4 page. The final result
> will depend also of the area of the canvas
> being exported, controlled by the x, y, width and height options (the
> default is to export the visible part).
> A bit of experimentation will get you the correct values of these
> options.

No, maybe I did not describe what I want to achieve accurately; I do not
want the output to be scaled, but to be printed in the exact requested
millimeter-size.
I got it now though that this can be achieved by setting the pagex
and pagey values accordingly; I gather that for an A4 page this should be
approx. pagex=298, pagey=421 with pageanchor='center'. For some reason
here this is still a little bit off, but maybe this can be blamed on the
worn mechanics of my cheap old printer. Or maybe the printer has some
sort of hard-wired margin on each side that it cannot print on and that
ought to be taken into account (if the users only knew about it).

Anyway, I wasted some paper and found that for this particular printer
values of pagex=290.2 and pagey=419.5 seem to be as close to perfect as
it gets with that sort of hardware.

Thanks again, and have a nice day :)

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

History tends to exaggerate.
		-- Col. Green, "The Savage Curtain", stardate 5906.4

From klappnase at freenet.de  Fri Jul  2 12:02:37 2021
From: klappnase at freenet.de (Michael Lange)
Date: Fri, 2 Jul 2021 18:02:37 +0200
Subject: [Tkinter-discuss] Trying to center the output of
 Canvas.postscript() onto A4 page
In-Reply-To: <b790b8cd-ce77-6ed4-63ae-7f15df75c2ea@tartan.co.za>
References: <20210702092337.bce210daf73f1c7893e0b24f@web.de>
 <b790b8cd-ce77-6ed4-63ae-7f15df75c2ea@tartan.co.za>
Message-ID: <20210702180237.5e7b3309be31ba24cd108a56@freenet.de>

On Fri, 2 Jul 2021 10:14:10 +0200
Paul Malherbe <paul at tartan.co.za> wrote:

> Hi Michael, this might help
> 
> http://www.atmos.albany.edu/facstaff/rmctc/psrotate/
> signature Regards
> 
> Paul Malherbe

thanks for the tip, it might possibly.
Meanwhile I found a better solution, though (see my other
post... understanding Tk command options helps :)

Have a nice day :)

Michael


.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Do you know the one -- "All I ask is a tall ship, and a star to steer
her by ..."  You could feel the wind at your back, about you ...  the
sounds of the sea beneath you.  And even if you take away the wind and
the water, it's still the same.  The ship is yours ... you can feel her
... and the stars are still there.
		-- Kirk, "The Ultimate Computer", stardate 4729.4

From greg.ewing at canterbury.ac.nz  Fri Jul  2 20:22:17 2021
From: greg.ewing at canterbury.ac.nz (Greg Ewing)
Date: Sat, 3 Jul 2021 12:22:17 +1200
Subject: [Tkinter-discuss] [Solved] Re: Trying to center the output of
 Canvas.postscript() onto A4 page
In-Reply-To: <20210702175839.cda5d70b037796c8bfa7bb83@web.de>
References: <20210702092337.bce210daf73f1c7893e0b24f@web.de>
 <CAKmRqbY8V6YPyqd=1g7wOzemBT4ccPOU5MWJks7fuAidgOxReQ@mail.gmail.com>
 <20210702175839.cda5d70b037796c8bfa7bb83@web.de>
Message-ID: <2ded70ea-c0ff-f7af-9605-ec835e2651ef@canterbury.ac.nz>

On 3/07/21 3:58 am, Michael Lange wrote:
> Or maybe the printer has some
> sort of hard-wired margin on each side that it cannot print on and that
> ought to be taken into account

Yes, most printers have an unprintable area of a few mm, and
it's not necessarily symmetrical. The manual would presumably
tell you about it, if it hasn't succumbed to Manual Existence
Failure over the years. :-)

-- 
Greg

From klappnase at web.de  Sat Jul  3 06:49:39 2021
From: klappnase at web.de (Michael Lange)
Date: Sat, 3 Jul 2021 12:49:39 +0200
Subject: [Tkinter-discuss] [Solved] Re: Trying to center the output of
 Canvas.postscript() onto A4 page
In-Reply-To: <2ded70ea-c0ff-f7af-9605-ec835e2651ef@canterbury.ac.nz>
References: <20210702092337.bce210daf73f1c7893e0b24f@web.de>
 <CAKmRqbY8V6YPyqd=1g7wOzemBT4ccPOU5MWJks7fuAidgOxReQ@mail.gmail.com>
 <20210702175839.cda5d70b037796c8bfa7bb83@web.de>
 <2ded70ea-c0ff-f7af-9605-ec835e2651ef@canterbury.ac.nz>
Message-ID: <20210703124939.bbd1f65328c53579f95979a3@web.de>

Hi,

On Sat, 3 Jul 2021 12:22:17 +1200
Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:

> On 3/07/21 3:58 am, Michael Lange wrote:
> > Or maybe the printer has some
> > sort of hard-wired margin on each side that it cannot print on and
> > that ought to be taken into account
>
> Yes, most printers have an unprintable area of a few mm, and
> it's not necessarily symmetrical. The manual would presumably
> tell you about it, if it hasn't succumbed to Manual Existence
> Failure over the years. :-)

the manual on the CD that came with the printer actually does.
According to the manual the margin is 3.4 mm left and right and 3.0 mm at
the top and 12.7 mm at the bottom for A4 paper.
If my calculation is correct this would put the horizontal center of the
printable area at 292.8 points. Since try-and-error experiments show that
290.2 is better, I assume that the precision of the manual is
probably limited.

Best regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Blast medicine anyway!  We've learned to tie into every organ in the
human body but one.  The brain!  The brain is what life is all about.
		-- McCoy, "The Menagerie", stardate 3012.4

From Vasilis.Vlachoudis at cern.ch  Mon Jul 12 13:13:18 2021
From: Vasilis.Vlachoudis at cern.ch (Vasilis Vlachoudis)
Date: Mon, 12 Jul 2021 17:13:18 +0000
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
Message-ID: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>

Recently I've got a 4k laptop, and the first experience with linux and the 4k display is quite painful.
I am still trying to tune it but for the moment my tkinter applications do not render nicely on such a display.
- all widths like borderwidths, decorations, separators etc, set in pixels do not scale with the dpi settings. Could we use "mm" for their settings instead?
- checkbox, radiobox the indicator appears tiny wrt the text

Is there a way to detect from tkinter a high res display and force a window scaling x2 for everything?
What is your experience with such displays?

Vasilis
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From klappnase at web.de  Mon Jul 12 20:04:29 2021
From: klappnase at web.de (Michael Lange)
Date: Tue, 13 Jul 2021 02:04:29 +0200
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
Message-ID: <20210713020429.559fd6c247011c1a23d48b7e@web.de>

Hi,

On Mon, 12 Jul 2021 17:13:18 +0000
Vasilis Vlachoudis <Vasilis.Vlachoudis at cern.ch> wrote:

> Recently I've got a 4k laptop, and the first experience with linux and
> the 4k display is quite painful. I am still trying to tune it but for
> the moment my tkinter applications do not render nicely on such a
> display.
> - all widths like borderwidths, decorations, separators etc, set in
> pixels do not scale with the dpi settings. Could we use "mm" for their
> settings instead?

why not try it?

>>> from tkinter import *
>>> r=Tk()
>>> b=Button(r, bd='2m')
>>> b.pack()

looks like a 2 mm border here ;)
But then:

>>> b.configure(width='40m')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.7/tkinter/__init__.py", line 1485, in configure
    return self._configure('configure', cnf, kw)
  File "/usr/lib/python3.7/tkinter/__init__.py", line 1476, in _configure
    self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
_tkinter.TclError: expected integer but got "40m"
>>> b.configure(bitmap='questhead')
>>> b.configure(width='40m')
>>> # this worked!

So, things might be a bit tricky :)


> - checkbox, radiobox the indicator appears tiny wrt the text

Agreed, these may be even more tricky.

>
> Is there a way to detect from tkinter a high res display and force a
> window scaling x2 for everything? What is your experience with such
> displays?

I don't have any experience with 4k displays, but had a similar problem
when I set up a little app I wanted to run on my 1080p TV. From 3 m
distance even with that display a highlight thickness of 1 pixel is hard
to detect for my old eyes.
I ended up with an option database that changed the defaults of font
size, highlightthickness etc. to values that seemed to me appropriate in
that context.
Detecting the resolution of the display in use should be easy enough,
just use winfo_screenwidth() ; the values for such an option database
could then easily be calculated depending on the screen size, so maybe
fiddling with the dpi is not necessary.

With ttk widgets things might be more difficult, though. Might be that
the best way in the end is to edit one of the existing ttk themes to fit
your needs and save it as themename_4k or so.
And the checkbutton/radiobutton indicators still will remain tiny (as
well as any other images may seem too small).

Best regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

There is a multi-legged creature crawling on your shoulder.
		-- Spock, "A Taste of Armageddon", stardate 3193.9

From xepaine13 at gmail.com  Mon Jul 12 15:31:57 2021
From: xepaine13 at gmail.com (E Paine)
Date: Mon, 12 Jul 2021 20:31:57 +0100
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
Message-ID: <D78B1F8D-5DFF-4CE5-9CB1-0107E9469BAB@getmailspring.com>

> - all widths like borderwidths, decorations, separators etc, set in
> pixels do not scale with the dpi settings. Could we use "mm" for their
> settings instead?

Definitely! The defaults in Tk use pixels, but you can use mm for lengths:
tk.Label(root, text="foo", borderwidth="5mm", relief="groove")

> - checkbox, radiobox the indicator appears tiny wrt the text

This may be related to https://bugs.python.org/issue41969, in which case
you're just waiting for your repos to update Tk.

> Is there a way to detect from tkinter a high res display and force a
> window scaling x2 for everything?

IDLE has a `fix_scaling` method. Maybe you could use something similar? https://github.com/python/cpython/blob/da2e673c5/Lib/idlelib/run.py#L313

Hope this helped!

From klappnase at web.de  Tue Jul 13 05:13:51 2021
From: klappnase at web.de (Michael Lange)
Date: Tue, 13 Jul 2021 11:13:51 +0200
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <D78B1F8D-5DFF-4CE5-9CB1-0107E9469BAB@getmailspring.com>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
 <D78B1F8D-5DFF-4CE5-9CB1-0107E9469BAB@getmailspring.com>
Message-ID: <20210713111351.0ca5c2ab40ec724999f59a13@web.de>

Hi,

On Mon, 12 Jul 2021 20:31:57 +0100
E Paine <xepaine13 at gmail.com> wrote:

> > - all widths like borderwidths, decorations, separators etc, set in
> > pixels do not scale with the dpi settings. Could we use "mm" for their
> > settings instead?
>
> Definitely! The defaults in Tk use pixels, but you can use mm for
> lengths: tk.Label(root, text="foo", borderwidth="5mm", relief="groove")
>
> > - checkbox, radiobox the indicator appears tiny wrt the text
>
> This may be related to https://bugs.python.org/issue41969, in which case
> you're just waiting for your repos to update Tk.

Not sure, this seems to be a windows-specific thing. The OP was more
interested in ways to let Tk do the job by itself (at least that is what
I assumed :) .

>
> > Is there a way to detect from tkinter a high res display and force a
> > window scaling x2 for everything?
>
> IDLE has a `fix_scaling` method. Maybe you could use something similar?
> https://github.com/python/cpython/blob/da2e673c5/Lib/idlelib/run.py#L313

Looks like this will scale only font sizes. To scale "everything" you can
try to use the "tk scaling" command directly, like

root.tk.call('tk', 'scaling', chosen_dpi / 72.0)

(I thought that's what Vasilis already does).

Please note that this must be called early in the code, before any
widgets are created.

According to `man tk` this should scale everything that is measured in
"physical units" like mm, points or inches, but it won't scale e.g. a
borderwidth or a font size given in pixels. Obviously it won't scale
images either, which I guess is the problem with the check- and
radiobuttons; the indicators are probably just hard-coded images or
bitmaps.

Another problem with that fix_scaling() method might be that it relies on
the scaling factor already in use (I guess), which may be treacherous, at
least if you have a cheap monitor (like I do :) . These monitors often
report incorrect EDID data, which lead to an incorrect default dpi value
(in my case iirc with default settings everything appeared too small on
the screen, like a 100 mm line being displayed at 80 mm size or so; with
linux I had to manually override the dpi X11 uses to work around this;
I never bothered to check with windows, but I suppose that problem
still exists).

When using "tk scaling" you can add some configuration switch to let the
user decide which dpi value to use.

Best regards

Michael

.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Without followers, evil cannot spread.
		-- Spock, "And The Children Shall Lead", stardate 5029.5

From aivar.annamaa at gmail.com  Tue Jul 13 06:41:29 2021
From: aivar.annamaa at gmail.com (Aivar Annamaa)
Date: Tue, 13 Jul 2021 13:41:29 +0300
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
Message-ID: <CAEbkakebsXgajPbwGFP0biVR36Yu+PQuKQVtU7f0OCOb0vgkZA@mail.gmail.com>

If you want to relate your screen distances to the size of characters in a
font, then you could use font's `measure` method to compute pixel distances
for *em*-s:
https://github.com/thonny/thonny/blob/3f2607ff0b27ffedac9b24a107ea9fff5f6b1f1f/thonny/ui_utils.py#L2271

Best regards,
Aivar

On Mon, Jul 12, 2021 at 8:13 PM Vasilis Vlachoudis <
Vasilis.Vlachoudis at cern.ch> wrote:

> Recently I've got a 4k laptop, and the first experience with linux and the
> 4k display is quite painful.
> I am still trying to tune it but for the moment my tkinter applications do
> not render nicely on such a display.
> - all widths like borderwidths, decorations, separators etc, set in pixels
> do not scale with the dpi settings. Could we use "mm" for their settings
> instead?
> - checkbox, radiobox the indicator appears tiny wrt the text
>
> Is there a way to detect from tkinter a high res display and force a
> window scaling x2 for everything?
> What is your experience with such displays?
>
> Vasilis
> _______________________________________________
> Tkinter-discuss mailing list
> Tkinter-discuss at python.org
> https://mail.python.org/mailman/listinfo/tkinter-discuss
>
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From Vasilis.Vlachoudis at cern.ch  Wed Jul 14 09:48:43 2021
From: Vasilis.Vlachoudis at cern.ch (Vasilis Vlachoudis)
Date: Wed, 14 Jul 2021 13:48:43 +0000
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <CAEbkakebsXgajPbwGFP0biVR36Yu+PQuKQVtU7f0OCOb0vgkZA@mail.gmail.com>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>,
 <CAEbkakebsXgajPbwGFP0biVR36Yu+PQuKQVtU7f0OCOb0vgkZA@mail.gmail.com>
Message-ID: <0BC70B5D93E054469872FFD0FE07220E033835D72C@CERNXCHG54.cern.ch>

Thank you all for the suggestions.
I am going to try them.
It would have been nice it tk had a global option to rescale everything by x2
Like in XFCE window manager

Vasilis

________________________________
From: Tkinter-discuss [tkinter-discuss-bounces+vasilis.vlachoudis=cern.ch at python.org] on behalf of Aivar Annamaa [aivar.annamaa at gmail.com]
Sent: Tuesday, July 13, 2021 12:41
To: tkinter-discuss at python.org
Subject: Re: [Tkinter-discuss] 4k HiDPI displays and tkinter

If you want to relate your screen distances to the size of characters in a font, then you could use font's `measure` method to compute pixel distances for em-s: https://github.com/thonny/thonny/blob/3f2607ff0b27ffedac9b24a107ea9fff5f6b1f1f/thonny/ui_utils.py#L2271

Best regards,
Aivar

On Mon, Jul 12, 2021 at 8:13 PM Vasilis Vlachoudis <Vasilis.Vlachoudis at cern.ch<mailto:Vasilis.Vlachoudis at cern.ch>> wrote:
Recently I've got a 4k laptop, and the first experience with linux and the 4k display is quite painful.
I am still trying to tune it but for the moment my tkinter applications do not render nicely on such a display.
- all widths like borderwidths, decorations, separators etc, set in pixels do not scale with the dpi settings. Could we use "mm" for their settings instead?
- checkbox, radiobox the indicator appears tiny wrt the text

Is there a way to detect from tkinter a high res display and force a window scaling x2 for everything?
What is your experience with such displays?

Vasilis
_______________________________________________
Tkinter-discuss mailing list
Tkinter-discuss at python.org<mailto:Tkinter-discuss at python.org>
https://mail.python.org/mailman/listinfo/tkinter-discuss
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From Vasilis.Vlachoudis at cern.ch  Wed Jul 14 10:22:37 2021
From: Vasilis.Vlachoudis at cern.ch (Vasilis Vlachoudis)
Date: Wed, 14 Jul 2021 14:22:37 +0000
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E033835D72C@CERNXCHG54.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>,
 <CAEbkakebsXgajPbwGFP0biVR36Yu+PQuKQVtU7f0OCOb0vgkZA@mail.gmail.com>,
 <0BC70B5D93E054469872FFD0FE07220E033835D72C@CERNXCHG54.cern.ch>
Message-ID: <0BC70B5D93E054469872FFD0FE07220E033835D815@CERNXCHG54.cern.ch>

I am trying to change the tk widgets to ttk, so I can globally correct them, e.g.
root=tk.Tk()
sb=ttk.Scrollbar(root)
sb.pack(side=tk.RIGHT,fill=tk.Y)
style=ttk.Style()
style.configure("TScrollbar", width="10m")

However the width doesn't apply on the up/downarrows which they remain tiny.
Where I can find the style options that I can change?
I've tried
style.configure("TScrollbar.uparrow", width="10m")
but doesn't work

Vasilis

________________________________
From: Tkinter-discuss [tkinter-discuss-bounces+vasilis.vlachoudis=cern.ch at python.org] on behalf of Vasilis Vlachoudis [Vasilis.Vlachoudis at cern.ch]
Sent: Wednesday, July 14, 2021 15:48
To: Aivar Annamaa; tkinter-discuss at python.org
Subject: Re: [Tkinter-discuss] 4k HiDPI displays and tkinter

Thank you all for the suggestions.
I am going to try them.
It would have been nice it tk had a global option to rescale everything by x2
Like in XFCE window manager

Vasilis

________________________________
From: Tkinter-discuss [tkinter-discuss-bounces+vasilis.vlachoudis=cern.ch at python.org] on behalf of Aivar Annamaa [aivar.annamaa at gmail.com]
Sent: Tuesday, July 13, 2021 12:41
To: tkinter-discuss at python.org
Subject: Re: [Tkinter-discuss] 4k HiDPI displays and tkinter

If you want to relate your screen distances to the size of characters in a font, then you could use font's `measure` method to compute pixel distances for em-s: https://github.com/thonny/thonny/blob/3f2607ff0b27ffedac9b24a107ea9fff5f6b1f1f/thonny/ui_utils.py#L2271

Best regards,
Aivar

On Mon, Jul 12, 2021 at 8:13 PM Vasilis Vlachoudis <Vasilis.Vlachoudis at cern.ch<mailto:Vasilis.Vlachoudis at cern.ch>> wrote:
Recently I've got a 4k laptop, and the first experience with linux and the 4k display is quite painful.
I am still trying to tune it but for the moment my tkinter applications do not render nicely on such a display.
- all widths like borderwidths, decorations, separators etc, set in pixels do not scale with the dpi settings. Could we use "mm" for their settings instead?
- checkbox, radiobox the indicator appears tiny wrt the text

Is there a way to detect from tkinter a high res display and force a window scaling x2 for everything?
What is your experience with such displays?

Vasilis
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From klappnase at web.de  Wed Jul 14 13:48:00 2021
From: klappnase at web.de (Michael Lange)
Date: Wed, 14 Jul 2021 19:48:00 +0200
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E033835D815@CERNXCHG54.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
 <CAEbkakebsXgajPbwGFP0biVR36Yu+PQuKQVtU7f0OCOb0vgkZA@mail.gmail.com>
 <0BC70B5D93E054469872FFD0FE07220E033835D72C@CERNXCHG54.cern.ch>
 <0BC70B5D93E054469872FFD0FE07220E033835D815@CERNXCHG54.cern.ch>
Message-ID: <20210714194800.1211c8a69177a91574ca9717@web.de>

Hi,

On Wed, 14 Jul 2021 14:22:37 +0000
Vasilis Vlachoudis <Vasilis.Vlachoudis at cern.ch> wrote:

> I am trying to change the tk widgets to ttk, so I can globally correct
> them, e.g. root=tk.Tk()
> sb=ttk.Scrollbar(root)
> sb.pack(side=tk.RIGHT,fill=tk.Y)
> style=ttk.Style()
> style.configure("TScrollbar", width="10m")
>
> However the width doesn't apply on the up/downarrows which they remain
> tiny. Where I can find the style options that I can change?
> I've tried
> style.configure("TScrollbar.uparrow", width="10m")
> but doesn't work

looking at defaults.tcl helps :)

At least here on X11 with default ttk style

st.configure('TScrollbar', width='10m', arrowsize='10m')

works.

With the default style scaling a checkbutton with

st.configure('TCheckbutton', indicatordiameter='10m')

also works, not with the "alt" theme though (I guess they are using a
bitmap there again).

Best regards

Michael


.-.. .. ...- .   .-.. --- -. --.   .- -. -..   .--. .-. --- ... .--. . .-.

Without freedom of choice there is no creativity.
		-- Kirk, "The return of the Archons", stardate 3157.4

From pmal at tartan.co.za  Wed Jul 14 11:54:29 2021
From: pmal at tartan.co.za (Paul)
Date: Wed, 14 Jul 2021 17:54:29 +0200
Subject: [Tkinter-discuss] 4k HiDPI displays and tkinter
In-Reply-To: <0BC70B5D93E054469872FFD0FE07220E033835D815@CERNXCHG54.cern.ch>
References: <0BC70B5D93E054469872FFD0FE07220E033835CDD9@CERNXCHG54.cern.ch>
 <CAEbkakebsXgajPbwGFP0biVR36Yu+PQuKQVtU7f0OCOb0vgkZA@mail.gmail.com>
 <0BC70B5D93E054469872FFD0FE07220E033835D72C@CERNXCHG54.cern.ch>
 <0BC70B5D93E054469872FFD0FE07220E033835D815@CERNXCHG54.cern.ch>
Message-ID: <84336349-bcad-ade6-faa4-7d626fefb60b@tartan.co.za>

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