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36 lines
930 B
Ruby
36 lines
930 B
Ruby
# 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-gradient.rb,v 1.2 2005/10/12 15:23:49 ktou Exp $
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=begin
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= cairo/Gradient
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This demo shows how to use GDK and cairo to gradient.
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From http://cairographics.org/samples/gradient.html.
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=end
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require 'common'
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module Demo
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class CairoGradient < CairoWindow
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def initialize
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super('cairo gradient')
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end
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def draw(cr)
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pat = Cairo::LinearPattern.new(0.0, 0.0, 0.0, 1.0)
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pat.add_color_stop_rgb(1, 0, 0, 0)
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pat.add_color_stop_rgb(0, 1, 0, 0)
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cr.rectangle(0, 0, 1, 1)
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cr.set_source(pat)
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cr.fill
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pat = Cairo::RadialPattern.new(0.45, 0.4, 0.1, 0.4, 0.4, 0.5)
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pat.add_color_stop_rgba(0, 1, 1, 1, 0.8)
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pat.add_color_stop_rgba(1, 0, 0, 0)
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cr.set_source(pat)
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cr.arc(0.5, 0.5, 0.3, 0, 2 * Math::PI)
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cr.fill
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end
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end
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end
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