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=begin header
graypreview.rb - a part of testgtk.c rewritten in Ruby/GTK2
Copyright (C) 2002,2003 Ruby-GNOME2 Project Team
Rewritten by Hiroshi IGARASHI <igarashi@ueda.info.waseda.ac.jp>
$Date: 2003/02/01 16:46:23 $
$Id: graypreview.rb,v 1.4 2003/02/01 16:46:23 mutoh Exp $
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'
# #
# # Gray Preview
# #
# static int gray_idle = 0
# gint
# gray_idle_func (GtkWidget *preview)
# static int count = 1
# guchar buf[256]
# int i, j
# for (i = 0; i < 256; i++)
# {
# for (j = 0; j < 256; j++)
# buf[j] = i + j + count
# preview.draw_row(buf, 0, i, 256)
# }
# count += 1
# preview.draw(nil)
# return true
# end
# def
# gray_preview_destroy (GtkWidget *widget,
# GtkWidget **window)
# gtk_idle_remove (gray_idle)
# gray_idle = 0
# #window = nil
# end
# void
# create_gray_preview ()
# static GtkWidget *window = nil
# GtkWidget *preview
# guchar buf[256]
# int i, j
# if (!window)
# {
# window = Gtk::Window::new(Gtk::WINDOW_TOPLEVEL)
# window.signal_connect("destroy",
# gray_preview_destroy,
# window)
# window.set_title("test")
# window.border_width(10)
# preview = Gtk::Preview::new(Gtk::PREVIEW_GRAYSCALE)
# preview.size(256, 256)
# window.add(preview)
# preview.show
# for (i = 0; i < 256; i++)
# {
# for (j = 0; j < 256; j++)
# buf[j] = i + j
# preview.draw_row(buf, 0, i, 256)
# }
# gray_idle = gtk_idle_add ((GtkFunction) gray_idle_func, preview)
# }
# if (!window.visible?)
# window.show
# else
# window.destroy
# end
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