For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Perl/Tk real time display
It's a real pleasure to be having an opportunity at the tail end of this week to write some examples that are combining Perl, Tk, and OO techniques.
This clock is generated on a canvas, and updates every second. It's generated in its own frame and schedules its own events, so you could easily use it within part of your own GUI if you wished. The hour, minute and second markers are all instances of an object of class hand, also defined within the example, and all the calls to the trig functions that are needed to work out the hand mappings and movements are encapsulated in there.
Tk's powerful canvas handling tools allow the text to be centred without complex calculations, and the display list technology it uses allows the hand markers to be moved without the need for repaint routines - it's truly impressive what can be done within a very few Kbytes of source
(written 2006-02-10, updated 2008-07-10)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articlesP307 - Perl/Tk 
Add a friendly front end with Tk - (2006-02-08) 
The magic of -textvariable - (2006-02-08) 
(Perl) Callbacks - what are they? - (2006-05-30) 
Callbacks - a more complex code sandwich - (2007-08-19) 
Tk locks up - 100% c.p.u. on a simple program (Tcl, Perl, Python) - (2007-09-09) 
Expect in Perl - a short explanation and a practical example - (2010-10-22)
Some other Articles
PHP - setting sort order with an associative arrayMP face to faceA fond memory of Sir FreddieIt costs nothing to say THANK YOUPerl/Tk real time displayShould we cruise around the world?Storing a regular expression in a perl variableTwice is a co-incidence and three times is a pattern
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