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Demo::CairoGradient

Public Class Methods

new() click to toggle source
# File gtk2/sample/gtk-demo/cairo-gradient.rb, line 15
def initialize
  super('cairo gradient')
end

Public Instance Methods

draw(cr) click to toggle source
# File gtk2/sample/gtk-demo/cairo-gradient.rb, line 19
def draw(cr)
  pat = Cairo::LinearPattern.new(0.0, 0.0,  0.0, 1.0)
  pat.add_color_stop_rgb(1, 0, 0, 0)
  pat.add_color_stop_rgb(0, 1, 0, 0)
  cr.rectangle(0, 0, 1, 1)
  cr.set_source(pat)
  cr.fill
  
  pat = Cairo::RadialPattern.new(0.45, 0.4, 0.1, 0.4, 0.4, 0.5)
  pat.add_color_stop_rgba(0, 1, 1, 1, 0.8)
  pat.add_color_stop_rgba(1, 0, 0, 0)
  cr.set_source(pat)
  cr.arc(0.5, 0.5, 0.3, 0, 2 * Math::PI)
  cr.fill
end

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