# File gtk/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