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

Are you a developer who would love to get into video games but get scared when he hears "OpenGL" or "rendering engines"? Or Maybe, you never considered writing a video game because you have heard Ruby was slow and you are not ready to give up on your favorite programming language. This talk is for you then. Together, we will build a very simple game using Ruby and the development tools offered by Apple. At the end of the presentation you will be ready to get started on your own project.

Video: http://www.confreaks.com/videos/192-rubyconf2009-writing-2d-games-for-the-osx-platform-in-ruby
Website: http://matt.aimonetti.net/posts/2009/11/21/rubyconf-2009-2d-games-for-os-x/

Transcript

1. rubyconf 2009 2d video game development with MacRuby matt aimonetti Sunday, November 22, 2009
2. test your memory Sunday, November 22, 2009
3. Sunday, November 22, 2009
4. Sunday, November 22, 2009
5. Sunday, November 22, 2009
6. Sunday, November 22, 2009
7. Sunday, November 22, 2009
8. Sunday, November 22, 2009
9. Sunday, November 22, 2009
10. Sunday, November 22, 2009
11. Sunday, November 22, 2009
12. Sunday, November 22, 2009
13. Sunday, November 22, 2009
14. Sunday, November 22, 2009
15. Sunday, November 22, 2009
16. Sunday, November 22, 2009
17. Sunday, November 22, 2009
18. Sunday, November 22, 2009
19. Sunday, November 22, 2009
20. Sunday, November 22, 2009
21. Sunday, November 22, 2009
22. Sunday, November 22, 2009
23. Sunday, November 22, 2009
24. Sunday, November 22, 2009
25. Sunday, November 22, 2009
26. Video Games are fun Sunday, November 22, 2009
27. Ruby Programming is fun Sunday, November 22, 2009
28. You have a mac Sunday, November 22, 2009
29. (if not, get one!) Sunday, November 22, 2009
30. video games on OSX OLD SCHOOL from scratch Sunday, November 22, 2009
31. truth Sunday, November 22, 2009
32. Sunday, November 22, 2009
33. Sunday, November 22, 2009
34. Sunday, November 22, 2009
35. but Sunday, November 22, 2009
36. Sunday, November 22, 2009
37. Sunday, November 22, 2009
38. popular games Sunday, November 22, 2009
39. Massively Multiplayer online role-playing games (MMORPG) Sunday, November 22, 2009
40. Sunday, November 22, 2009
41. Sunday, November 22, 2009
42. Sunday, November 22, 2009
43. too much work for a hacking project Sunday, November 22, 2009
44. first person shooter Sunday, November 22, 2009
45. Sunday, November 22, 2009
46. Sunday, November 22, 2009
47. Sunday, November 22, 2009
48. new types of games Sunday, November 22, 2009
49. Sunday, November 22, 2009
50. Sunday, November 22, 2009
51. online games Sunday, November 22, 2009
52. Sunday, November 22, 2009
53. Sunday, November 22, 2009
54. Sunday, November 22, 2009
55. iphone games Sunday, November 22, 2009
56. Sunday, November 22, 2009
57. Sunday, November 22, 2009
58. demo Sunday, November 22, 2009
59. MacRuby Sunday, November 22, 2009
60. Ruby for SCottish Sunday, November 22, 2009
61. Laurent Sansonetti Sunday, November 22, 2009
62. Sunday, November 22, 2009
63. Sunday, November 22, 2009
64. on obj-c runtime and GC Sunday, November 22, 2009
65. COCOA Apple's Objective-C based programming environment for Mac OS X Sunday, November 22, 2009
66. VIDEO GAME Sunday, November 22, 2009
67. Sunday, November 22, 2009
68. Sunday, November 22, 2009
69. keyboard Sunday, November 22, 2009
70. key event keyboard Sunday, November 22, 2009
71. key event keyboard GameData Sunday, November 22, 2009
72. Sunday, November 22, 2009
73. game loop Sunday, November 22, 2009
74. game loop 174 ❶ update layers Sunday, November 22, 2009
75. game loop 174 ❶ update layers update game items Sunday, November 22, 2009
76. game loop 174 ❶ update layers reposition update game items Sunday, November 22, 2009
77. game loop 174 ❶ update layers reposition update game items ❷ collisions Sunday, November 22, 2009
78. game loop 174 ❶ update layers reposition update game items ❷ collisions lives points sound Sunday, November 22, 2009
79. LOOP play DATA GAME Sunday, November 22, 2009
80. GAME PLAY Sunday, November 22, 2009
81. ⇧ ⇧ ⇧ ⇧ Sunday, November 22, 2009
82. NSView subclass Interface Builder Sunday, November 22, 2009
83. NSView subclass Interface Builder Sunday, November 22, 2009
84. class KeyboardControlView < NSView def keyDown(event) end end Sunday, November 22, 2009
85. class KeyboardControlView < NSView def keyDown(event) end end ⇧ ⇧ Sunday, November 22, 2009
86. acceleration Sunday, November 22, 2009
87. relative positioning Sunday, November 22, 2009
88. Sunday, November 22, 2009
89. GAME LOOP Sunday, November 22, 2009
90. usual workflow Sunday, November 22, 2009
91. usual workflow Sunday, November 22, 2009
92. video game Sunday, November 22, 2009
93. video game Sunday, November 22, 2009
94. 30 x per second Sunday, November 22, 2009
95. moves player moves objects resolves collisions updates score/level redraws graphics plays sounds Sunday, November 22, 2009
96. 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
97. 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
98. IntervalTimer.new(0.03, :target => self, :selector => 'refresh_screen:') Sunday, November 22, 2009
99. 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
100. GameData.all_layers.each do |layer| layer.update end Sunday, November 22, 2009
101. collided_bombs, collided_rubies = GameData.collisions Sunday, November 22, 2009
102. def collide_with?(other_rect) NSIntersectsRect(rect_version, other_rect) end Sunday, November 22, 2009
103. if !collided_bombs.empty? loose_a_life collided_bombs.each do |layer| layer.item.reset! end Sunday, November 22, 2009
104. else collided_rubies.each do |layer| GameData.increase_points(layer.item.points) update_points_display layer.item.reset! end Sunday, November 22, 2009
105. unless collided_rubies.empty? SoundEffects.frog(0.2) end level_change! if change_level? end Sunday, November 22, 2009
106. 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
107. GAME DATA Sunday, November 22, 2009
108. Sunday, November 22, 2009
109. module GameData module_function end Sunday, November 22, 2009
110. class GameController def awakeFromNib GameData.register_controller(self) end end Sunday, November 22, 2009
111. GameData.all_layers Sunday, November 22, 2009
112. class GameController def display_item(item) new_layer = ImageLayer.alloc.initWithItem(item) GameData.all_layers << new_layer # [...] end end Sunday, November 22, 2009
113. 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
114. cocoa hax Sunday, November 22, 2009
115. CocoaClass =~ RubyClass Sunday, November 22, 2009
116. don’t like an API? Sunday, November 22, 2009
117. Wrap it Sunday, November 22, 2009
118. 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
119. compilation Sunday, November 22, 2009
120. Sunday, November 22, 2009
121. PATH="$PATH:/usr/local/bin" macruby_deploy "$TARGET_BUILD_DIR/ $PROJECT_NAME.app" --embed --no-stdlib --compile Sunday, November 22, 2009
122. wanna hack? Sunday, November 22, 2009
123. best score post score Sunday, November 22, 2009
124. gosu framework Sunday, November 22, 2009
125. chipmunk physics Sunday, November 22, 2009
126. http://github.com/ mattetti/phileas_frog Sunday, November 22, 2009
127. Sunday, November 22, 2009
128. Thanks Sunday, November 22, 2009