Richard Suchenwirth - This 30-LOC cutie is the final example of Einfach Tcl, but in order to save you scrolling through much German text, here it is by itself: a clock that shows time either analog or digital - just click on it to toggle. The first part is a compaction of Kevin Kenny's An analog clock in Tk, the second has evolved on the after page. Enjoy!
#!/bin/sh
# -*-Tcl-*- \
exec wish $0
proc every {ms body} {
eval $body
after $ms [list every $ms $body]
}
proc drawhands w {
$w delete hands
set secSinceMidnight [expr { [clock seconds] - [clock scan 00:00:00] }]
foreach divisor {60 3600 43200} length {45 40 30} width {1 3 7} {
set angle [expr {$secSinceMidnight * 6.283185 / $divisor}]
set x [expr {50 + $length * sin($angle)}]
set y [expr {50 - $length * cos($angle)}]
$w create line 50 50 $x $y -width $width -tags hands
}
}
proc toggle {w1 w2} {
if [winfo ismapped $w2] {
foreach {w2 w1} [list $w1 $w2] break ;# swap
}
pack forget $w1
pack $w2
}
canvas .analog -width 100 -height 100 -bg white
every 1000 {drawhands .analog}
label .digital -textvar time -font {Courier 24}
every 1000 {set ::time [clock format [clock sec] -format %H:%M:%S]}
pack .analog
bind . <1> {toggle .analog .digital}