# swirl.rb

    #!/usr/local/bin/ruby18 -w
    require 'RMagick'

    # Demonstrate the Image#swirl method

    img = Magick::Image.read('images/Flower_Hat.jpg').first

    # Make an animated image.
    animation = Magick::ImageList.new
    animation << img.copy
    30.step(360,45) { |degrees| animation << img.swirl(degrees) }

    animation.delay = 20
    animation.iterations = 10000

    animation.write('swirl.gif')
    exit

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