RubyConf 2009 - Writing 2D games for the OSX platform in Ruby

rubyconf 2009 2d video game development with MacRuby matt aimonetti
Sunday, November 22, 2009

test your memory Sunday, November 22, 2009

Video Games are fun Sunday, November 22, 2009

Ruby Programming is fun Sunday, November 22, 2009

You have a mac Sunday, November 22, 2009

(if not, get one!) Sunday, November 22, 2009

video games on OSX OLD SCHOOL from scratch Sunday, November
22, 2009

truth Sunday, November 22, 2009

but Sunday, November 22, 2009

popular games Sunday, November 22, 2009

Massively Multiplayer online role-playing games (MMORPG) Sunday, November 22, 2009

too much work for a hacking project Sunday, November 22,
2009

first person shooter Sunday, November 22, 2009

new types of games Sunday, November 22, 2009

online games Sunday, November 22, 2009

iphone games Sunday, November 22, 2009

demo Sunday, November 22, 2009

MacRuby Sunday, November 22, 2009

Ruby for SCottish Sunday, November 22, 2009

Laurent Sansonetti Sunday, November 22, 2009

on obj-c runtime and GC Sunday, November 22, 2009

COCOA Apple's Objective-C based programming environment for Mac OS X

VIDEO GAME Sunday, November 22, 2009

keyboard Sunday, November 22, 2009

key event keyboard Sunday, November 22, 2009

key event keyboard GameData Sunday, November 22, 2009

game loop Sunday, November 22, 2009

game loop 174 ❶ update layers Sunday, November 22, 2009

game loop 174 ❶ update layers update game items Sunday,
November 22, 2009

game loop 174 ❶ update layers reposition update game items

❷ collisions Sunday, November 22, 2009

❷ collisions lives points sound Sunday, November 22, 2009

LOOP play DATA GAME Sunday, November 22, 2009

GAME PLAY Sunday, November 22, 2009

⇧ ⇧ ⇧ ⇧ Sunday, November 22, 2009

NSView subclass Interface Builder Sunday, November 22, 2009

class KeyboardControlView < NSView def keyDown(event) end end Sunday, November
22, 2009

class KeyboardControlView < NSView def keyDown(event) end end ⇧ ⇧

acceleration Sunday, November 22, 2009

relative positioning Sunday, November 22, 2009

GAME LOOP Sunday, November 22, 2009

usual workflow Sunday, November 22, 2009

video game Sunday, November 22, 2009

30 x per second Sunday, November 22, 2009

moves player moves objects resolves collisions updates score/level redraws graphics
plays sounds Sunday, November 22, 2009

module GameLoop def start_refreshing @timer = NSTimer.scheduledTimerWithTimeInterval 0.03, target: self,
selector: 'refresh_screen:', userInfo: nil, repeats: true end def refresh_screen(timer=nil) #… end end Sunday, November 22, 2009

NSTimer.scheduledTimerWithTimeInterval 0.03, target: self, selector: 'refresh_screen:', userInfo: nil, repeats: true
cocoa class method time interval method to call on the target some stuff we don’t care about ;) Sunday, November 22, 2009

IntervalTimer.new(0.03, :target => self, :selector => 'refresh_screen:') Sunday, November 22,
2009

def refresh_screen(timer=nil) GameData.all_layers.each{ |layer| layer.update } collided_bombs, collided_rubies=GameData.collisions if !collided_bombs.empty?
loose_a_life collided_bombs.each{|layer| layer.item.reset! } else collided_rubies.each do |layer| GameData.increase_points(layer.item.points) points.attributedStringValue = GameData.points.to_s layer.item.reset! end SoundEffects.collision(0.2) unless collided_rubies.empty? level_change! if change_level? end end Sunday, November 22, 2009

GameData.all_layers.each do |layer| layer.update end Sunday, November 22, 2009

collided_bombs, collided_rubies = GameData.collisions Sunday, November 22, 2009

def collide_with?(other_rect) NSIntersectsRect(rect_version, other_rect) end Sunday, November 22, 2009

if !collided_bombs.empty? loose_a_life collided_bombs.each do |layer| layer.item.reset! end Sunday, November
22, 2009

else collided_rubies.each do |layer| GameData.increase_points(layer.item.points) update_points_display layer.item.reset! end Sunday, November
22, 2009

unless collided_rubies.empty? SoundEffects.frog(0.2) end level_change! if change_level? end Sunday, November
22, 2009

module SoundEffects module_function @frog = NSSound.soundNamed("Frog") def frog(delay=0) @frog.performSelector(:play, withObject:
nil, afterDelay: delay) end end Sunday, November 22, 2009

GAME DATA Sunday, November 22, 2009

module GameData module_function end Sunday, November 22, 2009

class GameController def awakeFromNib GameData.register_controller(self) end end Sunday, November 22,
2009

GameData.all_layers Sunday, November 22, 2009

class GameController def display_item(item) new_layer = ImageLayer.alloc.initWithItem(item) GameData.all_layers << new_layer
# [...] end end Sunday, November 22, 2009

module GameConfig module_function def data @data ||= { :levels =>
[ { :name => 'Pond', :rubies => 3, :bombs => 12, :score_limit => 30, :vehicle => 'nenuphar', :bomb_image => 'bomb', :bomb_ratio => 1, :ruby_ratio => 1.5, :player_width => 0.2, :player_height => 0.2 }] } end Sunday, November 22, 2009

cocoa hax Sunday, November 22, 2009

CocoaClass =~ RubyClass Sunday, November 22, 2009

don’t like an API? Sunday, November 22, 2009

Wrap it Sunday, November 22, 2009

class NSButton def title_color=(color) current_font = self.attributedTitle.attribute(NSFontAttributeName, atIndex: 0, effectiveRange:
nil) opts = { NSForegroundColorAttributeName => color, NSFontAttributeName => current_font } self.attributedTitle = NSAttributedString.alloc.initWithString( self.title, attributes: opts) end end Sunday, November 22, 2009

compilation Sunday, November 22, 2009

PATH="$PATH:/usr/local/bin" macruby_deploy "$TARGET_BUILD_DIR/ $PROJECT_NAME.app" --embed --no-stdlib --compile Sunday, November 22,
2009

wanna hack? Sunday, November 22, 2009

best score post score Sunday, November 22, 2009

gosu framework Sunday, November 22, 2009

chipmunk physics Sunday, November 22, 2009

http://github.com/ mattetti/phileas_frog Sunday, November 22, 2009

Thanks Sunday, November 22, 2009

RubyConf 2009 - Writing 2D games for the OSX pl...

RubyConf 2009 - Writing 2D games for the OSX platform in Ruby

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