File: pattern1.rb

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ruby-rmagick 6.0.1-3
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require 'rmagick'

gc = Magick::Draw.new
gc.pattern('triangles', 0, 0, 16, 16) do
  gc.fill('darkblue')
  gc.rectangle(0, 0, 16, 16)
  gc.fill('yellow')
  gc.stroke('red')
  gc.polygon(0, 0, 8, 16, 16, 0, 0, 0)
end

gc.stroke('triangles')
gc.stroke_width(16)
gc.fill('none')
gc.ellipse(150, 75, 130, 60, 0, 360)

img = Magick::Image.new(300, 150, Magick::HatchFill.new('white', 'lightcyan2', 8))
gc.draw(img)

img.border!(1, 1, 'lightcyan2')

img.write('pattern1.gif')
exit