From: Jerome David Sallinger <imran.nazir@...>
Date: 2010-02-07T23:01:51+09:00
Subject: Symbols and class veriable

Hello, Is the any connection between a symbol and a class variable. For
example, if I declare the variable @red_car_speed is this aliased or
connected by :red_car_speed. The section of code that is confuring me
is:

-------------------------------------------------------
require 'ruby-processing'

class TwoCarObjects < Processing::App
  load_library :control_panel

  def setup
    control_panel do |c|
      c.slider :red_car_speed, -5..15
      c.slider :blue_car_speed, -5..15
    end

    # Initialize car objects
    @red_car  = Car.new(self, color(255,0,0), 0, 100)
    @blue_car  = Car.new(self, color(0,0,255), 0, 10)
    @red_car_speed = 1
    @blue_car_speed = 2
    rect_mode CENTER
  end

  def draw
  background 255

  # Operate the car object in draw
  # by calling object methods using the dots syntax.
  @red_car.move(@red_car_speed)
  @red_car.display_car
  @blue_car.move(@blue_car_speed)
  @blue_car.display_car
  end

end
-------------------------------------------------------

It seems that the symbols and class variable for, for example
red_car_speed are linked
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