TrafficLight

A traffic light application to drive home some Ruby OOP principles.

INSTALL

1. Get a copy of Shoes running, resources online at:

https://github.com/shoes/shoes4

• You'll need to install jruby:

	$ rvm install jruby

• And then shoes4:

	$ gem install shoes --pre

2. Fork your own copy of this exercise and clone it

  git clone https://github.com/dmgarland/TrafficLight.git
  cd TrafficLight

3. Run it!

    shoes traffic.rb

TODO

We'll be modifying a Shoes application that models a traffic light.

• Using inheritance, implement 3 subclasses of Bulb: GoBulb, WaitBulb and StopBulb. Change the subclasses so that when we define them, the correct colour is displayed. Suggest that the following colours are used:

State	Colour
Go	"#00FF30"
Wait	"#FFFC00"
Stop	"#FF0000"

• Refactor the implementation so that the colours are defined once in a module called TL, and we can refer to colours with the following syntax:

State	Colour
TL::Go	"#00FF30"
TL::Wait	"#FFFC00"
TL::Stop	"#FF0000"

• Refactor the implementation so that a bulb only shows its true colour when it is switched on, otherwise it shows grey. Fix the application so that it shows the TL::Stop state on startup.
• Implement the click method, so that every time the traffic light is clicked, the colours cycle through the states given in the TrafficLight class
• Animate the traffic light so that it cycles through its colours automatically, changing once a second. Use either an animate block (see the manual) to pull out each entry in turn or try looking up animate, every and timer in the Shoes manual.
• When you're done, submit a pull request so that I can review your work.
• Don't forget that you can use the debug method to show output to the shoes console.