EuRuKo presents
Javier Ramírez
(javier@formatinternet.com)
* in *
Fun with Ruby
(and without r***s)
Program your own
games with Gosu

the characters
Ruby ................. as The Damsel
Hardware ............ as The Villain
Gosu ...................... as The Hero
Chipmunk ........ as The Scientist
Rubyscript2exe ........ as Himself

why games
work rest play sleep
improve, have fun

why ruby
because i can!
less code, less clutter
easy to try out

why me
HTML
PASCAL /
BASIC C/C++ JAVA RUBY
ASP
DBase
LOGO SQL PHP
VBasic JavaScript
Assembler

Non-technical considerations
concept
●
game specs / core design
●
gameplay/game mechanics
●
balance
●
look and feel
●
More at “Game Architecture and Design: A New Edition”
by Andrew Rollings & David Morris

Part I
what's in a game?
(game development 101)

Web Development Abstraction

One ring to rule them all

Game Development Abstraction
3D games are the same, just harder

Game Development Components

the living game

Development Components
main loop / event loop
●
game logic: levels, collisions, AI ...
●
stateless images (tiles / models)
●
stateful images (sprites / models)
●
sound FX and music
●

Part II
when Ruby met Gosu

about
by Julian Raschke and Jan Lücker
Gosu ( 고수 ): High Hand - Leader
C++ + Ruby Bindings
http://code.google.com/p/gosu/
(http://tinyurl.com/euruko-gosu)

design rationale
Bloatfree: Gosu aims to contain everything that
is necessary to write a game in clean C++ or
Ruby code, yet not much more.
Reality-driven: Everything in Gosu exists for
the same single reason: It was necessary for
an existing project. Nothing was, and will ever
be, added out of boredom.

game demo

source code
http://tinyurl.com/euruko-games
http://code.google.com/p/eurukuest
(http://tinyurl.com/eurukuest)

Gosu::Window

Gosu::Image
load individually or tiled
drawing can be rotated / scaled
supports z-index
can use Rmagick objects

Gosu::Sample & Gosu::Song
full playback control
volume, speed, pause, resume,
stop, pan
looping supported
midi are better if converted to XM

Gosu::Font
can be a system font or a file
easy to check the real width
supports rotation and scaling

code walkthrough

about
by Scott Lembcke
A 2D rigid body physics library, designed
with 2D video games in mind.
http://code.google.com/p/chipmunk-physics
(http://tinyurl.com/euruko-chipmunk)

about

about

chipmunk basics
Space
Body
Shape
Vect
Joint

Part III
your 15 minutes of fame

doing it is just half the fun

tar2rubyscript
by Erik Veenstra
RBA file:
init.rb => tar + base64 + comments

rubyscript2exe
by Erik Veenstra
packages ruby, the script and all
dependencies together into an
executable file.
works on windows, linux, OSx

rubyscript2exe
First Step: it runs the application,
checking for all the required
gems and scripts, creating a list
of dependencies to include in
the executable

rubyscript2exe
The “Environment Embedding Executable”
gzips all the dependencies
and attaches the file to a copy of eee

muhahahahaha!
http://formatinternet.com
javier@formatinternet.com
http://twitter.com/supercoco9
http://www.workingwithrails.com/
person/5987-javier-ramirez