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=begin header
gammacurve.rb - a part of testgtk.c rewritten in Ruby/GTK2
Copyright (C) 2002-2005 Ruby-GNOME2 Project Team
$Id: gammacurve.rb,v 1.6 2005/07/17 16:55:27 mutoh Exp $
Rewritten by TAKAHASHI Hitoshi <thitoshi@ne.scphys.kyoto-u.ac.jp>
Original Copyright:
GTK - The GIMP Toolkit
Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
=end
require 'sample'
class GammaCurveSample < SampleWindow
include Math
def initialize
super("Gtk::GammaCurve")
set_border_width(10)
@curve = Gtk::GammaCurve.new
add(@curve)
@count = 0
end
def update
max = 127 + (@count % 2) * 128
@curve.curve.set_range(0, max, 0, max)
vec = []
max.times do |i|
vec[i] = (127 / sqrt(max)) * sqrt(i)
end
@curve.curve.set_vector(max, vec)
@count += 1
end
attr_reader :count
def GammaCurveSample.invoke
@singleton = new if @singleton.nil? or @singleton.destroyed?
@singleton.update
unless @singleton.visible?
@singleton.show_all
end
if @singleton.count == 4
@singleton.destroy
end
end
end
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