84 lines
2.5 KiB
Ruby
84 lines
2.5 KiB
Ruby
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# Copyright (c) 2005 Ruby-GNOME2 Project Team
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# This program is licenced under the same licence as Ruby-GNOME2.
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#
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# $Id: cairo-operator.rb,v 1.1 2005/10/12 05:38:30 ktou Exp $
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=begin
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= cairo/Operator
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This demo shows how to use GDK and cairo to use Cairo::OPERATOR_*
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From http://cairographics.org/samples/operator_add.html,
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http://cairographics.org/samples/operator_atop.html,
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http://cairographics.org/samples/operator_atop_reverse.html,
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http://cairographics.org/samples/operator_in.html,
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http://cairographics.org/samples/operator_in_reverse.html,
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http://cairographics.org/samples/operator_out.html,
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http://cairographics.org/samples/operator_out_reverse.html,
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http://cairographics.org/samples/operator_over.html,
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http://cairographics.org/samples/operator_over_reverse.html,
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http://cairographics.org/samples/operator_saturate.html and
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http://cairographics.org/samples/operator_xor.html
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=end
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require 'common'
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module Demo
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class CairoOperator < CairoWindow
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def initialize
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super('cairo operator')
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@operator = Cairo::OPERATOR_ADD
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set_default_size(400, 400)
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@drawing_area = child
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remove(@drawing_area)
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vbox = Gtk::VBox.new
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vbox.pack_start(@drawing_area, true, true)
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vbox.pack_start(operator_selector, false, false)
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add(vbox)
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end
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def draw(cr)
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cr.save do
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image = Cairo::ImageSurface.from_png("ruby-gnome2-logo.png")
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cr.translate(0.5, 0.5)
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cr.rotate(-45 * Math::PI / 180)
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cr.scale(0.8 / image.width, 0.8 / image.height)
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cr.translate(-0.5 * image.width, -0.5 * image.height)
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cr.set_source(image, 0.0, 0.0)
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cr.paint
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end
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cr.set_operator(@operator)
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cr.set_source_rgba(1, 0, 0, 0.5)
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cr.rectangle(0.2, 0.2, 0.5, 0.5)
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cr.fill
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cr.set_source_rgba(0, 1, 0)
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cr.rectangle(0.4, 0.4, 0.4, 0.4)
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cr.fill
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cr.set_source_rgba(0, 0, 1)
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cr.rectangle(0.6, 0.6, 0.3, 0.3)
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cr.fill
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end
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def operator_selector
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combo = Gtk::ComboBox.new
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operators = []
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Cairo.constants.each do |name|
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operators << name if /^OPERATOR_/ =~ name
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end
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operators.sort.each_with_index do |name, i|
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combo.append_text(name.to_s)
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combo.set_active(i) if Cairo.const_get(name) == @operator
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end
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combo.signal_connect("changed") do |widget|
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text = widget.active_text
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@operator = Cairo.const_get(text) if text
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@drawing_area.queue_draw
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end
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combo
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end
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end
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end
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