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require 'rmagick'
imgl = Magick::ImageList.new
imgl.new_image(500, 80, Magick::HatchFill.new('white', 'lightcyan2'))
gc = Magick::Draw.new
# Draw 5-pixel wide line
gc.stroke('LightPink')
gc.stroke_width(5)
gc.line(10, 30, 130, 30)
# Draw 10-pixel wide line
gc.stroke('LightSkyBlue2')
gc.stroke_width(10)
gc.line(130, 30, 230, 30)
# Draw 20-pixel wide line
gc.stroke('GreenYellow')
gc.stroke_width(20)
gc.line(230, 30, 370, 30)
# Draw 40-pixel wide line
gc.stroke('MediumOrchid2')
gc.stroke_width(40)
gc.line(370, 30, 490, 30)
# Draw 1-pixel wide line through the center
gc.stroke('black')
gc.stroke_width(1)
gc.line(10, 30, 490, 30)
# Annotate
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.text(60, 70, "'5'")
gc.text(180, 70, "'10'")
gc.text(300, 70, "'20'")
gc.text(420, 70, "'40'")
gc.draw(imgl)
imgl.border!(1, 1, 'lightcyan2')
imgl.write('stroke_width.gif')
exit
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