SOLID example for Alfonso

gistfile1.rb

# don't really need Shape class
class Shape
  def initialize(options)
  end
  
  def area
  end
end

class CircleShape
  attr_accessor :radius
  def initialize(options)
    self.radius = options.fetch(:radius)
  end
  
  def area
    2 * Math.pi * self.radius
  end
end

class RectangleShape
  attr_accessor :length, :width
  def initialize(options)
    self.length = options.fetch(:length)
    self.width  = options.fetch(:width)
  end
  
  def area
    @length * @width
  end
end

class TriangleShape
end

class PolygonShape
end
    
class ProgramEmotionInterface
  attr_accessor :program, :emotion
  def initialize(options)
    self.program = options.fetch(:program)
    self.shape   = options.fetch(:emotion)
  end
  
  def some_method_justifying_the_interface
  end
end

class ProgramShapeInterface
  attr_accessor :program, :shape
  def initialize(options)
    self.program = options.fetch(:program)
    self.shape   = options.fetch(:shape)
  end
  
  def some_method_justifying_the_interface
  end
end

class Program
  attr_accessor :area_sum
end