1. Tcl/Tk Part 2

2. Overview of Basic Tk Widgets
widget name arguments = basic Tk syntax
button calls tcl code when pushed
checkbutton on/off (toggle) button
entry text-entry widget
frame frames widgets inside a box
label displays text message
listbox scrolled list
radiobutton on/off button set; only one on
scale analog value from min to max
text text-entry widget

3. Overview of Tcl/Tk Syntax
Command arg1 arg2 arg3 = execute the command with the given arguments
“Text in quotes” = pass text in quotes as one arg; perform command and variable substitution
{Text in braces} = pass text in braces as one arg; defer command and variable substitution
$variable or ${variable} = substitute the value of the given variable
[command arg] = execute command; substitute value for command between square brackets
Command arg1 \
arg = extend command over one line
command 1; command 2 = two commands on one line

4. Tcl/Tk Demos BWidget – widget library application
Tktable – table application written in C
BLT – graphs application
These can be used to help build new applications and are all installed in the /usr/local directory of the machines sif and tyr.
You can learn much from studying the code of these demos.

5. Running the Demos on sif and tyr
BWidget
/usr/local/BWidget/demo/demo.tcl
Tktable (demos not in /usr/local)
cd ~mitchell/Tktable2.8
demos/basic.tcl,
demos/buttons.tcl
BLT
cd /usr/local/blt/lib/blt2.4/demos
/usr/local/blt/bin/bltwish spline.tcl
/usr/local/blt/bin/bltwish stripchart1.tcl