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

    # Demonstrate the Image#swirl method

    dog = Magick::Image.read('images/Dog2.jpg').first
    dog.scale!(250.0/dog.rows)

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

    animation.delay = 20
    animation.iterations = 10000
    #animation.animate
    animation.write('swirl.gif')
    exit