Dr. Dobb's Tcl-URL!

QOTW: "I don't mind having the posibility of shooting myself in the foot.
Just let me have the ability to extract the bullet with some good debugging
tools." -- David Gravereaux

"Doubt all you want, the truth is Tcl has improved a lot." -- Jeff Hobbs


POTW: XOTcl 1.1.0 by Gustaf Neumann and Uwe Zdun.  "XOTcl is an object-ori-
ented extension of Tcl".  "It prevails [sic] the Tcl programming style and
the dynamic/introspective nature of the language, rather than introducing
other language's styles and rigidness".
     http://www.xotcl.org


     Flipping a canvas as if in a mirror, including text and images:
         http://groups.google.com/groups?th=909d5b092878693c
         http://wiki.tcl.tk/FlippingACanvas

     What's the best way to evaluate a callback to script level from
     a different path of execution (i.e., another thread in C)?
         http://groups.google.com/groups?th=a99c05f2a9c458a8

     Ralf Fassel comprehensively answers the Frequently Asked Question
     of how to intercept the closing of a window:
         http://groups.google.com/groups?th=3c0016f39060cb54

     Tcl versions differ in their ability to recognize boolean strings
     like yes, no, on, off, true, and false:
         http://groups.google.com/groups?th=1d78e1df626d044c

     Martin Lemburg wonders why [foreach] behaves like it does
     when iterating over an empty list, and why loop structures
     don't return values like control structures do:
         http://groups.google.com/groups?th=3ce9ae392e42d0ac
         http://groups.google.com/groups?th=cbcbb799fc9a4844

     When your [puts -nonewline]s aren't putsing like they should,
     either turn off line buffering or flush them explicitly:
         http://groups.google.com/groups?th=a3889dc4a78db37a

     How to tell if a window is withdrawn, or just iconified:
         http://groups.google.com/groups?th=5b1351cf2ffdc4a0

     Do the values of %X and %Y vary according to their relative
     placement with respect to other substitutions in a binding?
         http://groups.google.com/groups?th=35f9c81af2b1e89d

     Using %E to tell "real" events from generated ones:
         http://groups.google.com/groups?th=aac17f3a291efca1

Thanks to Arjen Markus for his summary of recent Wiki activity:
  Lots of goodies on the Wiki this week for people who are interested
  in graphics or playing with windows:
  
  Working with images:
  - Maurice Ulis has published half a dozen pages on how to manipulate 
    an image, start at <http://wiki.tcl.tk/10524>.
  
  - Do you want to capture a window and create an image out of it?
    Here are a few solutions: <http::/wiki.tcl.tk/9127>
  
  Working with Tk:
  - A transparant toplevel window, any one? <http://wiki.tcl.tk/10515>
    may have the solution (at least on MS Windows)
  
  - A window of arbitrary shape, any one? <http://wiki.tcl.tk/6229>
    deals with Donal Fellows' Shape extension (and yes, it is on the 
    Tk 9.0 wish list :)
  
  - The looks of Tk are discussed on <http://wiki.tcl.tk/9485> with a
    Gtk solution on <http://wiki.tcl.tk/10424>
  
  Working with graphics:
  - I assume you know what a fractal is? Well, one way to produce very
    nice fractal pictures is by using simple linear (or better: affine)
    transformations. The Fern Fractal is the most well-known example:
    <http://wiki.tcl.tk/10492>
  
  - I was almost tempted to refer to <http://wiki.tcl.tk/10507> in 
    this summary, as Dutch people are usually fascinated by the weather,
    but then I noticed that it displays the current temperatures in
    degrees Fahrenheit ... 
  
  A bunch of more technical pages:
  - Generating forms for databases: <http://wiki.tcl.tk/6062>
  
  - Design patterns with SNIT: <http://wiki.tcl.tk/9639>
  
  - And fuzzy logic the simple way: <http://wiki.tcl.tk/5135>
  
  
Everything Tcl-related you want is probably one or two clicks away in these
pages:
    The "Welcome to comp.lang.tcl" message by Andreas Kupries
        http://www.purl.org/net/tcl-welcome

    The Tcl Developer Site is Tcl's "home base".
	http://www.tcl.tk

    Larry Virden maintains a comp.lang.tcl FAQ launcher
        http://www.purl.org/NET/Tcl-FAQ/

    The Tcl Developer Xchange is a highly organized resource center
    of documents and software with provisions for individuals to
    maintain references to their own software:
        http://www.tcl.tk/resource/
    The TDX sponsor, ActiveState, also keeps info to convince your
    boss Tcl is a good thing
        http://www.tcl.tk/scripting/

    The Tcl'ers Wiki is a huge, dynamic, collaboratively edited repository
    of documentation, examples, tutorials and pontifications on all things 
    Tcl.
        http://wiki.tcl.tk/0
    For the ideal overview of the topics about Tcl most likely to
    interest a newcomer, see "Arts and Crafts ..."
        http://wiki.tcl.tk/969

    ActiveState maintains binaries distribution and development tools
        http://www.activestate.com/Tcl
    along with a Cookbook of Tcl recipes
        http://aspn.activestate.com/ASPN/Cookbook/Tcl

    Cameron Laird tracks several Tcl/Tk references of interest
        http://phaseit.net/claird/comp.lang.tcl/

    Cetus Links maintains a Tcl/Tk page with verified links
        http://www.cetus-links.org/oo_tcl_tk.html

    Google Groups archives comp.lang.tcl.announce posts
        http://groups.yahoo.com/group/tcl_announce/

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Suggestions/corrections for next week's posting are always welcome.

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