Book update

.buildpath

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<buildpath>
+	<buildpathentry kind="src" path="01-hello"/>
+	<buildpathentry kind="src" path="02-warmup"/>
+	<buildpathentry kind="src" path="03-prototype"/>
+	<buildpathentry kind="src" path="04-prototype-optimized"/>
+	<buildpathentry kind="src" path="05-refactor"/>
+	<buildpathentry kind="src" path="06-physics"/>
+	<buildpathentry kind="src" path="07-damage"/>
+	<buildpathentry kind="src" path="08-ai"/>
+	<buildpathentry kind="src" path="09-polishing"/>
+	<buildpathentry kind="src" path="10-partitioning"/>
+	<buildpathentry kind="src" path="11-powerups"/>
+	<buildpathentry kind="src" path="12-stats"/>
+	<buildpathentry kind="src" path="13-advanced-ai"/>
+	<buildpathentry kind="con" path="org.eclipse.dltk.launching.INTERPRETER_CONTAINER"/>
+</buildpath>

.gitignore

@@ -0,0 +1,45 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Ruby template
+*.gem
+*.rbc
+/.config
+/coverage/
+/InstalledFiles
+/pkg/
+/spec/reports/
+/test/tmp/
+/test/version_tmp/
+/tmp/
+
+## Specific to RubyMotion:
+.dat*
+.repl_history
+build/
+
+## Documentation cache and generated files:
+/.yardoc/
+/_yardoc/
+/doc/
+/rdoc/
+
+## Environment normalisation:
+/.bundle/
+/vendor/bundle
+/lib/bundler/man/
+
+# for a library or gem, you might want to ignore these files since the code is
+# intended to run in multiple environments; otherwise, check them in:
+# Gemfile.lock
+# .ruby-version
+# .ruby-gemset
+
+# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
+.rvmrc
+
+# ignore idea stuff
+*.iml
+/.idea
+
+# ignore editor backups
+*~
+

.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>ruby-gamedev-book-examples</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.dltk.core.scriptbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.dltk.ruby.core.nature</nature>
+	</natures>
+</projectDescription>

.ruby-version

@@ -1 +1 @@
-2.1.3
+2.2.3

01-hello/hello_sound.rb

@@ -16,7 +16,7 @@ def self.load_animation(window)
 
   def self.load_sound(window)
     Gosu::Sample.new(
-      window, media_path('explosion.mp3'))
+      window, media_path('explosion.ogg'))
   end
 
   def initialize(animation, sound, x, y)
@@ -71,7 +71,7 @@ def initialize(width=800, height=600, fullscreen=false)
     @background = Gosu::Image.new(
       self, BACKGROUND, false)
     @music = Gosu::Song.new(
-      self, media_path('menu_music.mp3'))
+      self, media_path('menu_music.ogg'))
     @music.volume = 0.5
     @music.play(true)
     @animation = Explosion.load_animation(self)

03-prototype/entities/bullet.rb

@@ -10,7 +10,7 @@ def initialize(source_x, source_y, target_x, target_y)
     if trajectory_length > MAX_DIST
       @target_x, @target_y = point_at_distance(MAX_DIST)
     end
-    sound.play
+    sound.play if sound
   end
 
   def draw
@@ -54,7 +54,7 @@ def fire(speed)
 
   def sound
     @@sound ||= Gosu::Sample.new(
-      $window, Game.media_path('fire.mp3'))
+      $window, Game.media_path('fire.ogg'))
   end
 
   def trajectory_length

03-prototype/entities/explosion.rb

@@ -9,11 +9,11 @@ def animation
 
   def sound
     @@sound ||= Gosu::Sample.new(
-      $window, Game.media_path('explosion.mp3'))
+      $window, Game.media_path('explosion.ogg'))
   end
 
   def initialize(x, y)
-    sound.play
+    sound.play if sound
     @x, @y = x, y
     @current_frame = 0
   end

03-prototype/entities/tank.rb

@@ -13,12 +13,12 @@ def initialize(map)
     @body_angle = 0.0
     @gun_angle = 0.0
     @last_shot = 0
-    sound.volume = 0.3
+    sound.volume = 0.3 if sound
   end
 
   def sound
     @@sound ||= Gosu::Song.new(
-      $window, Game.media_path('tank_driving.mp3'))
+      $window, Game.media_path('tank_driving.ogg'))
   end
 
   def shoot(target_x, target_y)
@@ -47,9 +47,9 @@ def update(camera)
       Gosu::KbW, Gosu::KbS, Gosu::KbA, Gosu::KbD)
 
     if moving?
-      sound.play(true)
+      sound.play(true) if sound
     else
-      sound.pause
+      sound.pause if sound
     end
 
     if $window.button_down?(Gosu::MsLeft)

03-prototype/states/menu_state.rb

@@ -10,18 +10,22 @@ def initialize
   end
 
   def enter
-    music.play(true)
-    music.volume = 1
+    if music
+      music.play(true)
+      music.volume = 1
+    end
   end
 
   def leave
-    music.volume = 0
-    music.stop
+    if music
+      music.volume = 0
+      music.stop
+    end
   end
 
   def music
     @@music ||= Gosu::Song.new(
-      $window, Game.media_path('menu_music.mp3'))
+      $window, Game.media_path('menu_music.ogg'))
   end
 
   def update

04-prototype-optimized/entities/bullet.rb

@@ -10,7 +10,7 @@ def initialize(source_x, source_y, target_x, target_y)
     if trajectory_length > MAX_DIST
       @target_x, @target_y = point_at_distance(MAX_DIST)
     end
-    sound.play
+    sound.play if sound
   end
 
   def draw
@@ -55,7 +55,7 @@ def fire(speed)
 
   def sound
     @@sound ||= Gosu::Sample.new(
-      $window, Game.media_path('fire.mp3'))
+      $window, Game.media_path('fire.ogg'))
   end
 
   def trajectory_length

04-prototype-optimized/entities/explosion.rb

@@ -9,11 +9,11 @@ def animation
 
   def sound
     @@sound ||= Gosu::Sample.new(
-      $window, Game.media_path('explosion.mp3'))
+      $window, Game.media_path('explosion.ogg'))
   end
 
   def initialize(x, y)
-    sound.play
+    sound.play if sound
     @x, @y = x, y
     @current_frame = 0
   end

04-prototype-optimized/entities/tank.rb

@@ -13,12 +13,12 @@ def initialize(map)
     @body_angle = 0.0
     @gun_angle = 0.0
     @last_shot = 0
-    sound.volume = 0.3
+    sound.volume = 0.3 if sound
   end
 
   def sound
     @@sound ||= Gosu::Song.new(
-      $window, Game.media_path('tank_driving.mp3'))
+      $window, Game.media_path('tank_driving.ogg'))
   end
 
   def shoot(target_x, target_y)
@@ -48,9 +48,9 @@ def update(camera)
       Gosu::KbW, Gosu::KbS, Gosu::KbA, Gosu::KbD)
 
     if moving?
-      sound.play(true)
+      sound.play(true) if sound
     else
-      sound.pause
+      sound.pause if sound
     end
 
     if $window.button_down?(Gosu::MsLeft)

04-prototype-optimized/states/menu_state.rb

@@ -10,18 +10,22 @@ def initialize
   end
 
   def enter
-    music.play(true)
-    music.volume = 1
+    if music
+      music.play(true)
+      music.volume = 1
+    end
   end
 
   def leave
-    music.volume = 0
-    music.stop
+    if music
+      music.volume = 0
+      music.stop
+    end
   end
 
   def music
     @@music ||= Gosu::Song.new(
-      $window, Game.media_path('menu_music.mp3'))
+      $window, Game.media_path('menu_music.ogg'))
   end
 
   def update

05-refactor/entities/components/bullet_sounds.rb

@@ -1,14 +1,14 @@
 class BulletSounds
   class << self
     def play
-      sound.play
+      sound.play if sound
     end
 
     private
 
     def sound
       @@sound ||= Gosu::Sample.new(
-        $window, Utils.media_path('fire.mp3'))
+        $window, Utils.media_path('fire.ogg'))
     end
   end
 end

05-refactor/entities/components/explosion_sounds.rb

@@ -1,14 +1,14 @@
 class ExplosionSounds
   class << self
     def play
-      sound.play
+      sound.play if sound
     end
 
     private
 
     def sound
       @@sound ||= Gosu::Sample.new(
-        $window, Utils.media_path('explosion.mp3'))
+        $window, Utils.media_path('explosion.ogg'))
     end
   end
 end

05-refactor/entities/components/tank_sounds.rb

@@ -4,7 +4,7 @@ def update
       if @driving && @driving.paused?
         @driving.resume
       elsif @driving.nil?
-        @driving = driving_sound.play(1, 1, true)
+        @driving = driving_sound.play(1, 1, true) if driving_sound
       end
     else
       if @driving && @driving.playing?
@@ -14,14 +14,14 @@ def update
   end
 
   def collide
-    crash_sound.play(1, 0.25, false)
+    crash_sound.play(1, 0.25, false) if crash_sound
   end
 
   private
 
   def driving_sound
     @@driving_sound ||= Gosu::Sample.new(
-      $window, Utils.media_path('tank_driving.mp3'))
+      $window, Utils.media_path('tank_driving.ogg'))
   end
 
   def crash_sound

06-physics/entities/components/bullet_sounds.rb

@@ -1,14 +1,14 @@
 class BulletSounds
   class << self
     def play
-      sound.play
+      sound.play if sound
     end
 
     private
 
     def sound
       @@sound ||= Gosu::Sample.new(
-        $window, Utils.media_path('fire.mp3'))
+        $window, Utils.media_path('fire.ogg'))
     end
   end
 end

06-physics/entities/components/explosion_sounds.rb

@@ -1,14 +1,14 @@
 class ExplosionSounds
   class << self
     def play
-      sound.play
+      sound.play if sound
     end
 
     private
 
     def sound
       @@sound ||= Gosu::Sample.new(
-        $window, Utils.media_path('explosion.mp3'))
+        $window, Utils.media_path('explosion.ogg'))
     end
   end
 end

06-physics/entities/components/tank_sounds.rb

@@ -4,7 +4,7 @@ def update
       if @driving && @driving.paused?
         @driving.resume
       elsif @driving.nil?
-        @driving = driving_sound.play(0.3, 1, true)
+        @driving = driving_sound.play(0.3, 1, true) if driving_sound
       end
     else
       if @driving && @driving.playing?
@@ -14,14 +14,14 @@ def update
   end
 
   def collide
-    crash_sound.play(0.3, 0.25, false)
+    crash_sound.play(0.3, 0.25, false) if crash_sound
   end
 
   private
 
   def driving_sound
     @@driving_sound ||= Gosu::Sample.new(
-      $window, Utils.media_path('tank_driving.mp3'))
+      $window, Utils.media_path('tank_driving.ogg'))
   end
 
   def crash_sound