From: Greg Willits <lists@...>
Date: 2007-11-23T02:58:19+09:00
Subject: Class Methods from Modules

Can't see the tree for the forest.

Playing with how to integrate modules, classes, subclasses, and create
instance methods and class methods from modules.

In this play code below, I want to use initialize_colors in either the
class Shape or Square as a class method.

At this point I'm sure I'm missing a very simple syntax rule explained
very clearly in the books, but the code as is complains about
initialize_colors as being undefined, and I'm just not recognizing what
I am missing.


module Color

  def initialize_colors
    @fill_color   = 'ffffff'
    @border_color   = '000000'
  end

  def set_fill_rgb(color)
    if color == 'white'
      @fill_color = 'ffffff'
    elsif color == 'red'
      @fill_color = 'ff0000'
    elsif color == 'blue'
      @fill_color = '0000ff'
    elsif color == 'black'
      @fill_color = '000000'
    end
  end
end

class Shape

  include Color

  attr_reader :fill_color, :border_color

  def initialize
    @fill_color   = String.new
    @border_color   = String.new
  end
end

class Square < Shape

  initialize_colors

end

sq = Square.new
puts sq.fill_color
sq.set_fill_rgb('red')
puts sq.fill_color
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