RubyのTkを用いてニコニコ動画みたいに文字を左から右に流す

flowing_comment.rb

#!/usr/bin/ruby
require 'tk'

c = Tk::Canvas.new(nil, :width=>600, :height=>400, :relief=>:sunken,
                   :borderwidth=>3).pack(:fill=>:both, :expand=>true)

f = TkFont.new('Helvetica -16')

tag = TkcTag.new(c)

t = Thread.new do
    for i in 0..600/4
        t = TkcText.new(c, 600-i*4, 200, :text=>'test object', :font=>f, :tags=>tag)
        sleep 0.1
        t.delete
    end
end

Tk.mainloop
t.join