# drawcomp.rb

    #!/usr/bin/ruby1.9.1 -w

    require 'RMagick'

    # Read the snake image file and scale to 200 pixels high.
    begin
        snake = Magick::ImageList.new("images/Snake.wmf")
        snake.scale!(200.0/snake.rows)

        # Read the coffee cup image and scale to 200 pixels high.
        coffee = Magick::ImageList.new("images/Coffee.wmf")
        coffee.scale!(200.0/coffee.rows)

        # We want the "no" symbol to be a little smaller.
        # Read and scale to 150 pixels high.
        sign = Magick::ImageList.new("images/No.wmf")
        sign.scale!(150.0/sign.rows)

        # Change the white pixels in the sign to transparent.
        sign = sign.matte_replace(0,0)

        # Create a "nosnake" draw object. Add a composite
        # primitive that composites the "no" symbol over
        # the snake. Draw it.
        nosnake = Magick::Draw.new
        nosnake.composite((snake.columns-sign.columns)/2,
                          (snake.rows-sign.rows)/2, 0, 0, sign)
        nosnake.draw(snake)

        # Repeat for the coffee cup.
        nocoffee = Magick::Draw.new
        nocoffee.composite((coffee.columns-sign.columns)/2,
                           (coffee.columns-sign.columns)/2, 0, 0, sign)
        nocoffee.draw(coffee)

        coffee.write("drawcomp1.gif")
        snake.write("drawcomp2.gif")

    rescue Magick::ImageMagickError
        puts "#{$0}: ImageMagickError - #{$!}"
    end
    exit

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