1 files changed, 40 insertions, 0 deletions
diff --git a/library/demos/timer b/library/demos/timer
new file mode 100644
index 0000000..b2edd11
--- /dev/null
+++ b/library/demos/timer
@@ -0,0 +1,40 @@
+#!/bin/sh
+# the next line restarts using wish \
+exec wish "$0" "$@"
+
+# timer --
+# This script generates a counter with start and stop buttons.
+#
+# SCCS: @(#) timer 1.6 96/02/16 10:49:20
+
+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 .