Slides for javier ramirez's talk at EuRuKo 2009

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

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

3. why games
work rest play sleep
improve, have fun

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

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

6. 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

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

8. Web Development Abstraction

9. One ring to rule them all

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

11. Game Development Components

12. the living game

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

14. Part II
when Ruby met Gosu

15. 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)

16. 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.

17. game demo

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

19. Gosu::Window

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

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

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

23. code walkthrough

24. 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)

25. about

26. about

27. chipmunk basics
Space
Body
Shape
Vect
Joint

28. Part III
your 15 minutes of fame

29. doing it is just half the fun

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

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

32. 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

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

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