Comparing version 2 and version 1 back

h1. 18th Ruby/Rails Meeting – Hirakata

h2. What is Ruby

* Everything is Object.
* Open Class - you can extend every class
* Block - do ... end (or { ... } )
* Useful classes:
** Numeric, String, Symbol, Array, Hash, Regexp, Range

h3. Class and Instance

link_to('',{:page => 2})
link_to '', {:page => 2}
link_to '', :page => 2


h3. Rails

* *CoC* (Convention over Configuration)
* *DRY* (Don't Repeat Yourself)

h3. Sample application - BBS

$ rails -d sqlite3 bbs && cd bbs
$ script/generate model Comment
%% edit app/models/comment.rb
%% edit db/migrate/001_create_comments.rb
$ rake db:migrate


better use _scaffold_resource_ , it will create model, controller and the migration

h2. The Ruby "Saho"

how to look "beautiful". "busaho" - mazui ;)

h3. Basics

* object
* block
* duck typing
* metaprogramming

h3. "Busaho"

* The code is not gentle for the programmer
* overloading (in C++ and Java it's usual)
* creating classes just for the classes themself (overwork)
* just copy-paste from some design patterns
* difficult method names
* _eval()_ is not the evil, it's the LAST weapon

what to use for binary data - _pack()_ and _unpack()_ ? pack library?


h2. Game programming with Ruby - MyGame library

Dan-san, dGames, http://dgames.jp/dan/

There is a book - "starting game programming with ruby" + CD

h3. Concepts

* SDL-based (Ruby/SDL)short code (multiplatform)
* everything is object (character, blocks, tree, sky etc.)
* designed for begginers
* to be easy and "tanoshii" ;)

h3. Install

* SDL
* Ruby
* Ruby/SDL
* MyGame

For Windows: ActiveScriptRuby, download and install Ruby/SDL
install_mygame.rb


Other: _mygame-0.9.1.tar.gz_


h3. Usage

* Bootstrap - (_require ''_)
* Main loop - block (_do..end_), 60 times per sec (60Hz)
** clear screan
** _wait()_
** create object (render)
** display object
* Using _display_ object
* Keys
** _key_pressed?()_
** _new_key_pressed?()_

h3. Sample

require 'mygame/boot'
Image.render 'sample.png', :x => 100, :y => 100
Image.render 'sample.png', :x => 100, :y => 200

image = Image.new('sample.png')
image.x = 50
image.y = 100
image.scale = 2.0
image.angle = 90
image.alpha = 128
image.render

counter = 0
main_loop do
  image.render
  image.x += 1       # moving the object (sliding)
  image.angle += 8   # rotation

  # using keys
  image.x += 8 if key_pressed?(Key::RIGHT)
  image.x -= 8 if key_pressed?(Key::LEFT)
  image.y += 8 if key_pressed?(Key::DOWN)
  image.y -= 8 if key_pressed?(Key::UP)

  counter += 1 if new_key_pressed?(Key::SPACE)
  Font.render(counter)
end


h2. Internationalization in Ruby

Ruby-GetText-Package

8 steps in internationalization

application -> .pot file -> ja, pl -> .mo

# vim config/environment.rb
# vim app/controllers/application.rb
# vim Rakefile
# rake updatepo
# (make po files from the .pot file)
# rake makemo


require 'gettext/rails'
....


"Ujihisa-san's slides on SlideShare":http://www.slideshare.net/ujihisa/i35s

h2. Rails service

PatchService - http://www.patchservice.net/