71 lines
1.7 KiB
Ruby
71 lines
1.7 KiB
Ruby
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#!/usr/bin/env ruby
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=begin
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alpha-demo.rb - alpha blended window sample script. (need xcompmgr)
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Original: alphademo.py by Mike Hearn (*1) and David Trowbridge (*2)
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* (1) http://plan99.net/~mike/blog/2006/06/05/alpha-blended-windows-in-python/
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* (2) http://david.navi.cx/blog/?p=91
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Translated to Ruby by Juergen Mangler <juergen.mangler@univie.ac.at>
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Copyright (c) 2006 Ruby-GNOME2 Project Team
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This program is licenced under the same licence as Ruby-GNOME2.
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$Id: alpha-demo.rb,v 1.1 2007/01/06 03:55:44 ktou Exp $
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=end
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require 'gtk2'
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require 'cairo'
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class AlphaDemo < Gtk::Window
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def initialize()
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super()
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set_app_paintable(true)
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set_title("AlphaDemo")
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set_decorated(false)
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set_default_size(200, 220)
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signal_connect("delete_event") do
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Gtk.main_quit
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end
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set_double_buffered(false)
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signal_connect('expose-event') do |widget, event|
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cr = widget.window.create_cairo_context
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rgba = [1.0, 1.0, 1.0]
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rgba << 0.0 if @supports_alpha
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cr.set_source_rgba(rgba)
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cr.set_operator(Cairo::OPERATOR_SOURCE)
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cr.paint
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twidth, theight = widget.size
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cr.set_source_rgba(1.0, 0.2, 0.2, 0.6)
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radius = [twidth, theight].min.to_f / 2 - 0.8
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cr.arc(twidth.to_f / 2, theight.to_f / 2, radius, 0, 2.0 * Math::PI)
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cr.fill_preserve
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cr.stroke
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end
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signal_connect('screen-changed') do |widget, old_screen|
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screen_changed(widget, old_screen)
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end
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screen_changed(self)
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end
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def screen_changed(widget,old_screen=nil)
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tcolormap = widget.screen.rgba_colormap
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@supports_alpha = !tcolormap.nil?
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tcolormap ||= widget.screen.rgb_colormap
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widget.set_colormap(tcolormap)
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end
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end
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alpha = AlphaDemo.new
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alpha.show
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Gtk.main()
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