From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/ext/tk/sample/tkrttimer.rb | 77 +++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 jni/ruby/ext/tk/sample/tkrttimer.rb

(limited to 'jni/ruby/ext/tk/sample/tkrttimer.rb')

diff --git a/jni/ruby/ext/tk/sample/tkrttimer.rb b/jni/ruby/ext/tk/sample/tkrttimer.rb
new file mode 100644
index 0000000..1f9cbd9
--- /dev/null
+++ b/jni/ruby/ext/tk/sample/tkrttimer.rb
@@ -0,0 +1,77 @@
+#!/usr/bin/env ruby
+# This script is a re-implementation of tktimer.rb with TkTimer(TkAfter) class.
+
+require "tk"
+
+root = TkRoot.new(:title=>'realtime timer sample')
+
+f1 = TkFrame.new(:borderwidth=>2, :relief=>:ridge)
+f1.pack(:side=>:bottom, :fill=>:both)
+TkLabel.new(f1, :text=>'use TkTimer (TkAfter) class').pack(:anchor=>:center)
+label1 = TkLabel.new(:parent=>f1, :relief=>:raised,
+                     :width=>10).pack(:fill=>:both)
+
+f2 = TkFrame.new(:borderwidth=>2, :relief=>:ridge)
+f2.pack(:side=>:bottom, :fill=>:both)
+TkLabel.new(f2, :text=>'use TkRTTimer class').pack
+label2 = TkLabel.new(:parent=>f2, :relief=>:raised,
+                     :width=>10).pack(:fill=>:both)
+
+TkLabel.new(:padx=>10, :pady=>5, :justify=>'left', :text=><<EOT).pack
+Interval setting of each timer object is 10 ms.
+Each timer object counts up the value on each callback
+(the value is not the clock data).
+The count of the TkTimer object is delayed by execution
+time of callbacks and inaccuracy of interval.
+On the other hand, the count of the TkRTTimer object is
+not delayed. Its callback interval is not accurate too.
+But it can compute error correction about the time when
+a callback should start.
+EOT
+
+# define the procedure repeated by the TkTimer object
+tick = proc{|aobj| #<== TkTimer object
+  cnt = aobj.return_value + 1  # return_value keeps a result of the last proc
+  label = aobj.current_args[0]
+  label.text format("%d.%02d", *(cnt.divmod(100)))
+  cnt #==> return value is kept by TkTimer object
+      #    (so, can be send to the next repeat-proc)
+}
+
+timer1 = TkTimer.new(10, -1, [tick, label1])    # 10 ms interval
+timer2 = TkRTTimer.new(10, -1, [tick, label2])  # 10 ms interval
+
+timer1.start(0, proc{ label1.text('0.00'); 0 })
+timer2.start(0, proc{ label2.text('0.00'); 0 })
+
+b_start = TkButton.new(:text=>'Start', :state=>:disabled) {
+  pack(:side=>:left, :fill=>:both, :expand=>true)
+}
+
+b_stop  = TkButton.new(:text=>'Stop', :state=>:normal) {
+  pack('side'=>'left', 'fill'=>'both', 'expand'=>'yes')
+}
+
+b_start.command {
+  timer1.continue
+  timer2.continue
+  b_stop.state(:normal)
+  b_start.state(:disabled)
+}
+
+b_stop.command {
+  timer1.stop
+  timer2.stop
+  b_start.state(:normal)
+  b_stop.state(:disabled)
+}
+
+TkButton.new(:text=>'Reset', :state=>:normal) {
+  command { timer1.reset; timer2.reset }
+  pack(:side=>:right, :fill=>:both, :expand=>:yes)
+}
+
+ev_quit = TkVirtualEvent.new('Control-c', 'Control-q')
+Tk.root.bind(ev_quit, proc{Tk.exit}).focus
+
+Tk.mainloop
-- 
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