Checkout no-command-classes branch for an alternative solution.

Clone this repo, run bundle install. To start the bitmap editor run the following command

ruby -Ilib runner.rb

bundle exec rspec spec/

There are 8 supported commands:

• I M N - Create a new M x N image with all pixels coloured white (O).
• C - Clears the table, setting all pixels to white (O).
• L X Y C - Colours the pixel (X,Y) with colour C.
• V X Y1 Y2 C - Draw a vertical segment of colour C in column X between rows Y1 and Y2 (inclusive).
• H X1 X2 Y C - Draw a horizontal segment of colour C in row Y between columns X1 and X2 (inclusive).
• S - Show the contents of the current image
• ? - Displays help text
• X - Terminate the session