---system time call command

From: Bill Zhao (bzhaoa_at_tom.com)
Date: 12/25/03 

Date: Thu, 25 Dec 2003 22:41:02 +0800

Dear All,

   See below. it the demo file "timer" in the package tk-8.3.3-67
I did test it in windows and linux in my pc. and found that timer is
slow than system timer.

I want to improve it and get it use system time call in place of loop
counting which cause dida loss.

Sombody know what the system is ?

Bill Zhao

#!/bin/sh
# the next line restarts using wish \
exec wish8.3 "$0" "$@"

# timer --
# This script generates a counter with start and stop buttons.
#
# RCS: @(#) $Id: timer,v 1.2 1998/09/14 18:23:30 stanton Exp $

label .counter -text 0.00 -relief raised -width 10
button .start -text Start -command {
     if $stopped {
        set stopped 0
        tick
     }
}
button .stop -text Stop -command {set stopped 1}
pack .counter -side bottom -fill both
pack .start -side left -fill both -expand yes
pack .stop -side right -fill both -expand yes

set seconds 0
set hundredths 0
set stopped 1

proc tick {} {
     global seconds hundredths stopped
     if $stopped return
     after 50 tick
     set hundredths [expr $hundredths+5]
     if {$hundredths >= 100} {
        set hundredths 0
        set seconds [expr $seconds+1]
     }
     .counter config -text [format "%d.%02d" $seconds $hundredths]
}

bind . <Control-c> {destroy .}
bind . <Control-q> {destroy .}
focus .

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