Photography and OOP: Understanding OOP

gistfile1.rb

class Picture

  def exposure(light_level, depth_of_field, motion_capture)

      def light_level()
        if light_level == "daylight"
          iso=200
        elsif light_level == "night"
          iso = 1600
        else
          iso = 800
        end

      def depth_of_field(scene)
        case scene
        when scene = "landscape"
          aperture = 'f\22'
        when scene = "portrait"
          aperture = 'f2.8'
        else
          aperture = 8
        end
      end

      def motion_capture(speed)
        case speed
        when speed == "slow"
          shutter_speed = "bulb"
        when speed == "flash"
          shutter_speed = "1/250"
        when speed == "sports"
          shutter_speed = "1/2000"
        else
          puts "Shutter speed not set!"
        end
  end
end

photo1 = Picture::new.exposure("daylight", "shallow", "sports")
photo2 = Picture::new.exposure("night", "landscape", "slow")