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/shoes/wiki/Building-Shoes

http://shoesrb.com/manual/Installing.html

I had to add the following line to my ~/.bashrc to get this running on OSX:

PATH=/Applications/Shoes.app/Contents/MacOS:$PATH

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
• Change the TrafficLight class so the pattern matches US-style traffic lights.
• When you're done, submit a pull request so that I can review your work.