DZone Snippets: Nohmad's Code Snippets

Resizing images using RMagick

nohmad (Gyoung-Yoon Noh) — Wed, 18 Jan 2006 17:59:56 GMT



require 'rubygems'

require 'RMagick'



include Magick



def append_filename(filename, suffix)

  extrac = filename.split('.')

  extrac[-2] += suffix

  extrac.join('.')

end                                                                                  

ARGV.each do |f|

  ImageList.new(f).resize(800, 600).write(append_filename(f, '_l'))

  ImageList.new(f).resize(400, 300).write(append_filename(f, '_m'))

  ImageList.new(f).resize(40, 30).write(append_filename(f, '_s'))

end

Using glade interface file in ruby-gnome2.

nohmad (Gyoung-Yoon Noh) — Mon, 04 Jul 2005 10:42:33 GMT



require 'gtk2'

require 'libglade2'



class SignalHandler

  def method_missing(method, *args)

    puts "#{method}: #{args}"

  end

end

sigmap = SignalHandler.new



Gtk.init

glade = GladeXML.new('hello.glade', nil, 'helloglade')

window = glade['main_window']

window.signal_connect("destroy") { Gtk.main_quit }

glade.signal_autoconnect_full do |source, target, signal, handler, data|

  source.signal_connect(signal) { sigmap.send(handler, data) }

end



window.show

Gtk.main

I did not know what file should I require. :(

How to display message when collection is empty

nohmad (Gyoung-Yoon Noh) — Wed, 04 May 2005 04:15:18 GMT



>> for i in [1]

>>   puts i

>> end.any? or puts "empty!"

1

=> true

>> for i in [ ]

>>   puts i

>> end.any? or puts "empty!"

empty!

=> nil

short circuit evaluation is not intutitive? try this.



>> class Array

>>   alias :__empty? :empty?

>>   def empty?

>>     yield if __empty? and block_given?

>>     __empty?

>>   end

>> end

=> nil

>> for i in [1]

>>   puts i

>> end.empty? { puts "empty!" }

1

=> false

>> for i in [ ]

>>   puts i

>> end.empty? { puts "empty!" }

empty!

=> true