* ext/tk/tcltklib.c: enforce thread-check and exception-handling to

avoid SEGV trouble.
* ext/tk/tkutil/tkutil.c; fix a bug on converting a SJIS string array
  to a Tcl's list string.
* ext/tk/tcltklib.c: wrap Tcl's original "namespace" command to
  protect from namespace crash.
* ext/tk/lib/multi-tk.rb: enforce exception-handling.
* ext/tk/lib/multi-tk.rb: catch IRB_EXIT to work on irb.
* ext/tk/lib/tk.rb: ditto.
* ext/tk/tcltklib.c: add TclTkLib.mainloop_thread?
* ext/tk/lib/multi-tk.rb: (bug fix) callback returns a value.
* ext/tk/lib/tk/canvas.rb (delete): bug fix when multiple arguments.
* ext/tk/lib/clock.rb: fix 'no method error'.
* ext/tk/lib/clock.rb (self.clicks): accept a Symbol argument.
* ext/tk/lib/variable.rb: be able to set default_value_type; :numeric,
  :bool, :string, :symbol, :list, :numlist or nil (default; same to
  :string). If set a type, TkVariable#value returns a value of the type.
* ext/tk/lib/tkextlib/tclx/tclx.rb: add Tk::TclX.signal to warn the
  risk of using TclX extension's 'signal' command.
* ext/tk/sample/irbtk.rb: irb with Ruby/Tk.
* ext/tk/sample/demos-*/anilabel.rb: bug fix on 'show code'
* ext/tk/sample/demos-*/aniwave.rb: new Ruby/Tk animation demo.
* ext/tk/sample/demos-*/pendulum.rb: ditto.
* ext/tk/sample/demos-*/goldberg.rb: ditto.
* ext/tk/sample/demos-*/widget: add entries of animation demos.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8046 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/tk/sample/demos-en/aniwave.rb

@@ -0,0 +1,115 @@
+#
+# animated wave demo (called by 'widget')
+#
+# based on Tcl/Tk8.5a2 widget demos
+
+# destroy toplevel widget for this demo script
+if defined?($aniwave_demo) && $aniwave_demo
+  $aniwave_demo.destroy 
+  $aniwave_demo = nil
+end
+
+# create toplevel widget
+$aniwave_demo = TkToplevel.new {|w|
+  title("Animated Wave Demonstration")
+  iconname("aniwave")
+  positionWindow(w)
+}
+
+# create label
+msg = TkLabel.new($aniwave_demo) {
+  font $font
+  wraplength '4i'
+  justify 'left'
+  text 'This demonstration contains a canvas widget with a line item inside it. The animation routines work by adjusting the coordinates list of the line.'
+}
+msg.pack('side'=>'top')
+
+# create frame
+TkFrame.new($aniwave_demo) {|frame|
+  TkButton.new(frame) {
+    text 'Dismiss'
+    command proc{
+      tmppath = $aniwave_demo
+      $aniwave_demo = nil
+      tmppath.destroy
+    }
+  }.pack('side'=>'left', 'expand'=>'yes')
+
+  TkButton.new(frame) {
+    text 'See Code'
+    command proc{showCode 'aniwave'}
+  }.pack('side'=>'left', 'expand'=>'yes')
+
+}.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m')
+
+# animated wave
+class AnimatedWaveDemo
+  def initialize(frame, dir=:left)
+    @direction = dir
+
+    # create canvas widget
+    @c = TkCanvas.new(frame, :width=>300, :height=>200, 
+                      :background=>'black')
+    @c.pack(:padx=>10, :pady=>10, :expand=>true)
+
+    # Creates a coordinates list of a wave. 
+    @waveCoords = []
+    @backupCoords = []
+    n = 0
+    (-10..300).step(5){|n| @waveCoords << [n, 100]; @backupCoords << [n, 100] }
+    @waveCoords << [n, 0]; @backupCoords << [n, 0]
+    @waveCoords << [n+5, 200]; @backupCoords << [n+5, 200]
+    @coordsLen = @waveCoords.length
+
+    # Create a smoothed line and arrange for its coordinates to be the
+    # contents of the variable waveCoords.
+    @line = TkcLine.new(@c, @waveCoords, 
+                        :width=>1, :fill=>'green', :smooth=>true)
+
+    # Main animation "loop". 
+    # Theoretically 100 frames-per-second (==10ms between frames)
+    @timer = TkTimer.new(10){ basicMotion; reverser }
+
+    # Arrange for the animation loop to stop when the canvas is deleted
+    @c.bindtags_unshift(TkBindTag.new('Destroy'){ @timer.stop })
+  end
+
+  # Basic motion handler. Given what direction the wave is travelling
+  # in, it advances the y coordinates in the coordinate-list one step in
+  # that direction.
+  def basicMotion
+    @backupCoords, @waveCoords = @waveCoords, @backupCoords
+    (0...@coordsLen).each{|idx|
+      if @direction == :left
+        @waveCoords[idx][1] = @backupCoords[(idx+1 == @coordsLen)? 0: idx+1][1]
+      else
+        @waveCoords[idx][1] = @backupCoords[(idx == 0)? -1: idx-1][1]
+      end
+    }
+    @line.coords(@waveCoords)
+  end
+
+  # Oscillation handler. This detects whether to reverse the direction
+  # of the wave by checking to see if the peak of the wave has moved off
+  # the screen (whose size we know already.)
+  def reverser
+    if @waveCoords[0][1] < 10
+      @direction = :right
+    elsif @waveCoords[-1][1] < 10
+      @direction = :left
+    end
+  end
+
+  # animation control
+  def move
+    @timer.start
+  end
+
+  def stop
+    @timer.stop
+  end
+end
+
+# Start the animation processing
+AnimatedWaveDemo.new($aniwave_demo, :left).move