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require 'rmagick'
canvas = Magick::Image.new(260, 125)
gc = Magick::Draw.new
gc.fill('black')
gc.rectangle(10, 20, 250, 90)
gc.stroke('blue')
gc.fill('yellow')
gc.stroke_width(10)
gc.opacity('25%')
gc.roundrectangle(20, 20, 60, 90, 5, 5)
gc.opacity('50%')
gc.roundrectangle(80, 20, 120, 90, 5, 5)
gc.opacity(0.75)
gc.roundrectangle(140, 20, 180, 90, 5, 5)
gc.opacity(1)
gc.roundrectangle(200, 20, 240, 90, 5, 5)
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.gravity(Magick::SouthGravity)
gc.text(-90, 15, '"25%"')
gc.text(-30, 15, '"50%"')
gc.text(30, 15, '"75%"')
gc.text(90, 15, '"100%"')
gc.draw(canvas)
canvas.write('opacity.png')
exit
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