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require 'rmagick'
imgl = Magick::ImageList.new
imgl.new_image(300, 100, Magick::HatchFill.new('white', 'lightcyan2'))
points = [
12, 93.75, 37, 93.75, 37, 81.25, 62, 81.25,
62, 93.75, 87, 93.75, 87, 62, 112, 62, 112, 93.75,
137, 93.75, 137, 43.75, 162, 43.75, 162, 93.75,
187, 93.75, 187, 25, 212, 25, 212, 93.75, 237, 93.75,
237, 6.25, 262, 6.25, 262, 93.75, 287, 93.75
]
gc = Magick::Draw.new
gc.stroke('blue').stroke_width(3)
gc.fill_opacity(0)
gc.polyline(*points)
gc.draw(imgl)
imgl.border!(1, 1, 'lightcyan2')
imgl.write('polyline.gif')
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