# circle.rb

    #!/usr/local/bin/ruby18 -w
    require 'RMagick'

    imgl = Magick::ImageList.new
    imgl.new_image(250, 250, Magick::HatchFill.new('white','LightCyan2'))

    gc = Magick::Draw.new

    # Draw the circle
    gc.fill_opacity(0)
    gc.stroke('red').stroke_width(3)
    gc.circle(125,125, 25, 125)

    # Draw a little gray circle on the perimeter
    gc.stroke_width(1)
    gc.stroke('gray50')
    gc.circle(25,125,28,128)

    # Draw a dot at the center
    gc.fill_opacity(1)
    gc.circle(125,125, 128,128)

    # Annotate the dots
    gc.font_weight(Magick::NormalWeight)
    gc.font_style(Magick::NormalStyle)
    gc.fill('black')
    gc.stroke('transparent')
    gc.text(132,125, "'125,125'")
    gc.text(32,125, "'25,125'")
    gc.draw(imgl)

    imgl.border!(1,1, 'lightcyan2')
    imgl.write("circle.gif")

Close window