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require 'rmagick'
# Demonstrate the GradientFill class
ROWS = 100
COLS = 300
START_COLOR = '#900'
END_COLOR = '#000'
fill = Magick::GradientFill.new(0, 0, 0, ROWS, START_COLOR, END_COLOR)
img = Magick::Image.new(COLS, ROWS, fill)
# Annotate the filled image with the code that created the fill.
ann = Magick::Draw.new
ann.annotate(img, 0, 0, 0, 0, "GradientFill.new(0, 0, 0, #{ROWS}, '#{START_COLOR}', '#{END_COLOR}')") do |options|
options.gravity = Magick::CenterGravity
options.fill = 'white'
options.stroke = 'transparent'
options.pointsize = 14
end
# img.display
img.write('gradientfill.gif')
exit
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