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continuous plotting with Tkinter
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Martin Blume
*nix forums addict


Joined: 20 Feb 2005
Posts: 53

PostPosted: Fri Feb 04, 2005 9:32 am    Post subject: Re: continuous plotting with Tkinter Reply with quote
"Russell E. Owen" schrieb
Quote:

I have a number-crunching application that spits out
a lot of numbers. Now I'd like to pipe this into a
python app and plot them using Tkinter, such as:
$ number_cruncher | myplot.py
But with Tkinter once I call Tkinter's mainloop() I
give up my control of the app and I can't continue to
read in data from stdin. Or can I? If so, how?

One way is to use a thread to read the numbers, then
make them available to the main thread via a Queue
object, which you poll for new values.

I already tinkered with threads, yet it didn't work.

I'll try again.

Quote:

Another option is to use a Tk-compatible file or socket
of some kind which triggers a callback when data comes
in. See

htttp://www.astro.washington.edu/rowen/TkinterSummary.html#FileHand
lers


Quote:
some ideas on this.

Thanks, I'll look.


Martin
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Russell E. Owen
*nix forums Guru Wannabe


Joined: 28 Feb 2005
Posts: 117

PostPosted: Thu Feb 03, 2005 7:25 pm    Post subject: Re: continuous plotting with Tkinter Reply with quote
In article <42010f48$0$3408$5402220f@news.sunrise.ch>,
"Martin Blume" <mblume@socha.net> wrote:

Quote:
I have a number-crunching application that spits out
a lot of numbers. Now I'd like to pipe this into a python
app and plot them using Tkinter, such as:
$ number_cruncher | myplot.py
But with Tkinter once I call Tkinter's mainloop() I
give up my control of the app and I can't continue to
read in data from stdin. Or can I? If so, how?

One way is to use a thread to read the numbers, then make them available
to the main thread via a Queue object, which you poll for new values.

Another option is to use a Tk-compatible file or socket of some kind
which triggers a callback when data comes in. See
<http://www.astro.washington.edu/rowen/TkinterSummary.html#FileHandlers>
some ideas on this.

-- Russell
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David Douard
*nix forums beginner


Joined: 02 Feb 2005
Posts: 3

PostPosted: Wed Feb 02, 2005 10:40 pm    Post subject: Re: continuous plotting with Tkinter Reply with quote
Martin Blume wrote:

Quote:
I have a number-crunching application that spits out
a lot of numbers. Now I'd like to pipe this into a python
app and plot them using Tkinter, such as:
$ number_cruncher | myplot.py
But with Tkinter once I call Tkinter's mainloop() I
give up my control of the app and I can't continue to
read in data from stdin. Or can I? If so, how?

Regards
Martin

Maybe the simpler is to run the Tk mainloop in a separate thread.
You may have a look a candygram which gives a very simple to use
multi-thread semantics (ala Haskell) and is simpler to use than the
threading module.
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Martin Blume
*nix forums addict


Joined: 20 Feb 2005
Posts: 53

PostPosted: Wed Feb 02, 2005 4:35 pm    Post subject: continuous plotting with Tkinter Reply with quote
I have a number-crunching application that spits out
a lot of numbers. Now I'd like to pipe this into a python
app and plot them using Tkinter, such as:
$ number_cruncher | myplot.py
But with Tkinter once I call Tkinter's mainloop() I
give up my control of the app and I can't continue to
read in data from stdin. Or can I? If so, how?

Regards
Martin
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Google
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