From: "Jonathan <zjll9@...> <zjll9@..." <zjll9@...>
Date: 2005-12-06T10:56:33+09:00
Subject: Re: injecting dynamic methods into a class

Here's the updated code:

require 'RMagick'
include Magick

module ImageBlob

  def ImageBlob.inject_assigners( attr_and_sizes_hash,
consumer_class )
    attr_and_sizes_hash.each {|attr_name, max_size|
      code = %{
        def #{attr_name}=( file )
          write_attribute( '#{attr_name}', ImageBlob.get_blob( file,
#{max_size} ))
        end
      }
      consumer_class.class_eval code }
  end

  def ImageBlob.get_blob( file, max_image_size )
    begin
      img = Image.from_blob( file.read ).first
      return nil if not img

      img.format = "JPG"

      if img.rows > max_image_size or img.columns > max_image_size
        if img.rows > img.columns
          factor = max_image_size / img.rows.to_f
        else
          factor = max_image_size / img.columns.to_f
        end

        img = img.scale( factor )
      end

      ret_val = img.to_blob
      GC.start
      return ret_val
    rescue
      return nil
    end
  end
end

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