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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Using Object Oriented Tcl and the Tk toolkit together - real life example

There are all sorts of ways to look at the survey data we gathered last October on the TransWilts trains, and one fact I'm particularly interested in is the journey lengths of passengers. I have all the information to hand that I need to work this out - but in different files:

Survey data [here]
Station OS positions [here]
And OS coding tables [here].

As I'm teaching Tcl this week - and using the object oriented iTcl and the Tk toolkit, I've written my code (and a nice GUI) in Tcl - source code [here] ... not the simplest of examples for my Blog, but a program that shows
  * Multiple object types
  * Use of common (static) variables
  * Use of the $this variable for the current object
which you'll not find in many other of my examples.

It's been great fun writing this example, the results are very informative (I'll be making comment on the Coffee Shop forum, and it's a real reminder of the power of Tcl which remains an excellent language even if it's not the height of fashion these days. Please let me know if you would like a Tcl course - it can be arranged ;-)
(written 2015-03-12, updated 2015-03-15)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
T245 - Tcl/Tk - [incr-Tcl]
  [290] Object Orientation in Tcl - [incr-Tcl] - (2005-04-24)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [1528] Object Oriented Tcl - (2008-02-02)
  [1819] Calling base class constructors - (2008-10-03)
  [1925] Introduction to Object Oriented Programming - (2008-12-06)
  [3142] Private and Public - and things between - (2011-01-22)
  [4456] Objects in Tcl - iTcl - updated first steps example - (2015-03-11)

T216 - Tcl/Tk - Introduction to Tk
  [595] Add a friendly front end with Tk - (2006-02-08)
  [2040] Error: Cant read xxxxx: no such variable (in Tcl Tk) - (2009-02-14)
  [4208] Tcl + Tk (Wish) - an introduction and revision example - (2013-11-15)

T219 - Tcl/Tk - Drawing on Canvases
  [2211] Tcl/Tk - why does the canvas widget use a display list? - (2009-06-01)

T050 - Tcl/Tk - Tcl, Tcl/Tk and Expect - General
  [2429] Tcl scripts / processes on a web server via CGI - (2009-09-27)
  [2474] Using Tcl and Expect to automate repetitive jobs - (2009-10-24)
  [2504] Learning to program in ... - (2009-11-15)
  [2681] Tcl - a great engineering language - (2010-03-17)
  [3192] Tcl - Some example of HOW TO in handling data files and formats - (2011-03-04)
  [3286] Should we cover expect and/or Tk on our public Tcl courses? - (2011-05-11)
  [4206] Writing the perfect program in Tcl? - (2013-11-13)
  [4434] Public training courses - upcoming dates - (2015-02-21)
  [4616] Still teaching Tcl in 2016? - (2016-01-06)


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Managing the window size (and layout) in Tcl/Tk
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Forward to
Reading from a URL, and reading Json, from your Tcl script
Some other Articles
Catching up on a week all in a single post (?)
Rail Conference, Nottingham
Server program written in Tcl using sockets
Reading from a URL, and reading Json, from your Tcl script
Using Object Oriented Tcl and the Tk toolkit together - real life example
Managing the window size (and layout) in Tcl/Tk
A new Tcl/tk example - a window to show system status
Test framework for TCL - Tcltest - some examples
Working out distance between places, using OS grid references and a program in Tcl
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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