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

    # Demonstrate the Image#color_fill_to_border method

    before = Magick::Image.new(200,200) {
        self.background_color = 'white'
        self.border_color = 'black'
        }
    before = before.border(2,2,'black')

    circle = Magick::Draw.new
    circle.fill('transparent')
    circle.stroke('black')
    circle.stroke_width(2)
    circle.circle(100,100,180,100)
    circle.fill('plum1')
    circle.stroke('transparent')
    circle.circle( 60,100, 40,100)
    circle.circle(140,100,120,100)
    circle.circle(100, 60,100, 40)
    circle.circle(100,140,100,120)
    circle.draw(before)

    after = before.color_fill_to_border(100,100, 'aquamarine')

    after.crop!(after.columns/2, 0, after.columns/2, after.rows)
    result = before.composite(after, Magick::EastGravity, Magick::OverCompositeOp)

    line = Magick::Draw.new
    line.line(result.columns/2, 0, result.columns/2, result.rows)
    line.draw(result)

    #result.display
    result.write('color_fill_to_border.gif')
    exit