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

    # Demonstrate the GradientFill class

    Rows = 100
    Cols = 500

    fill = Magick::GradientFill.new(-Cols, Rows, -Rows, Cols, "blue", "black")
    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, "Magick::GradientFill.new(-Cols, Rows, -Rows, Cols, \"blue\", \"black\")") {
    	self.gravity = Magick::CenterGravity
        self.fill = 'white'
        self.stroke = 'transparent'
        self.pointsize = 14
        }

    #img.display
    img.write("gradientfill.gif")
    exit