2d video game development with MacRuby

Transcription

1 2d video game development with MacRuby matt aimonetti rubyconf 2009

2 test your memory

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26 Video Games are fun

27 Ruby Programming is fun

28 You have a mac

29 (if not, get one!)

30 OLD SCHOOL video games on OSX from scratch

31 truth

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35 but

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38 popular games

39 Massively Multiplayer online role-playing games (MMORPG)

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43 too much work for a hacking project

44 first person shooter

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48 new types of games

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51 online games

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55 iphone games

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58 demo

59 MacRuby

60 Ruby for SCottish

61 Laurent Sansonetti

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64 on obj-c runtime and GC

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

66 VIDEO GAME

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69 keyboard

70 key event keyboard

71 key event GameData keyboard

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73 game loop

74 ❶ update 174 layers game loop

75 ❶ update 174 layers game loop update game items

76 ❶ update 174 layers game loop update reposition game items

77 ❶ update 174 layers game loop update reposition ❷ collisions game items

78 ❶ update 174 layers game loop update reposition ❷ collisions lives points game items sound

79 GAME DATA LOOP play

80 GAME PLAY

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82 NSView subclass Interface Builder

83 NSView subclass Interface Builder

84 class KeyboardControlView < NSView def keydown(event) end end

85 class KeyboardControlView < NSView def keydown(event) end end

86 acceleration

87 relative positioning

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89 GAME LOOP

90 usual workflow

91 usual workflow

92 video game

93 video game

94 30 x per second

95 moves player moves objects resolves collisions updates score/level redraws graphics plays sounds

96 module GameLoop def = NSTimer.scheduledTimerWithTimeInterval 0.03, target: self, selector: 'refresh_screen:', userinfo: nil, repeats: true end def refresh_screen(timer=nil) # end end

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

98 IntervalTimer.new(0.03, :target => self, :selector => 'refresh_screen:')

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

100 GameData.all_layers.each do layer end layer.update

101 collided_bombs, collided_rubies = GameData.collisions

102 def collide_with?(other_rect) end NSIntersectsRect(rect_version, other_rect)

103 if!collided_bombs.empty? loose_a_life collided_bombs.each do layer layer.item.reset! end

104 else collided_rubies.each do layer GameData.increase_points(layer.item.points) update_points_display layer.item.reset! end

105 unless collided_rubies.empty? SoundEffects.frog(0.2) end level_change! if change_level? end

106 module SoundEffects = NSSound.soundNamed("Frog") def withobject: nil, afterdelay: delay) end end

107 GAME DATA

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109 module GameData end module_function

110 class GameController def awakefromnib GameData.register_controller(self) end end

111 GameData.all_layers

112 class GameController def display_item(item) new_layer = ImageLayer.alloc.initWithItem(item) GameData.all_layers << new_layer # [...] end end

113 module GameConfig module_function def = { :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

114 cocoa hax

115 CocoaClass =~ RubyClass

116 don t like an API?

117 Wrap it

118 class NSButton end 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

119 compilation

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121 PATH="$PATH:/usr/local/bin" macruby_deploy "$TARGET_BUILD_DIR/ $PROJECT_NAME.app" --embed --no-stdlib --compile

122 wanna hack?

123 best score post score

124 gosu framework

125 chipmunk physics

126 mattetti/phileas_frog

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128 Thanks