Class: Chingu::GameState

Inherits:
Object
  • Object
show all
Includes:
Helpers::ClassInheritableAccessor, Helpers::GFX, Helpers::GameObject, Helpers::GameState, Helpers::InputClient, Helpers::InputDispatcher
Defined in:
lib/chingu/game_state.rb

Overview

Chingu incorporates a basic push/pop game state system (as discussed here: www.gamedev.net/community/forums/topic.asp?topic_id=477320). Game states is a way of organizing your intros, menus, levels. Game states aren't complicated. In Chingu a GameState is a class that behaves mostly like your default Gosu::Window (or in our case Chingu::Window) game loop.

# A simple GameState-example class Intro < Chingu::GameState

def update
  # game logic here
end

def draw
  # screen manipulation here
end

# Called when we enter the game state
def setup
  @player.angle = 0   # point player upwards
end

# Called when we leave the current game state
def finalize
  push_game_state(Menu)   # switch to game state "Menu"
end

end

Instance Attribute Summary collapse

Attributes included from Helpers::InputDispatcher

#input_clients

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Helpers::ClassInheritableAccessor

included

Methods included from Helpers::InputClient

#add_inputs, #holding?, #holding_all?, #holding_any?, #input, #input=, #on_input

Methods included from Helpers::InputDispatcher

#add_input_client, #dispatch_button_down, #dispatch_button_up, #dispatch_input_for, #remove_input_client

Methods included from Helpers::GameObject

#game_objects_of_class, #load_game_objects, #save_game_objects

Methods included from Helpers::GFX

#draw_arc, #draw_circle, #draw_rect, #fill, #fill_arc, #fill_circle, #fill_gradient, #fill_rect

Constructor Details

#initialize(options = {}) ⇒ GameState

Returns a new instance of GameState.


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# File 'lib/chingu/game_state.rb', line 106

def initialize(options = {})
  @options = options
  @game_objects = GameObjectList.new
  @input_clients = Array.new
  
  # Game state manager can be run alone
  if defined?($window) && $window.respond_to?(:game_state_manager)
    
    # Since we place the init of previous_game_state here, game states can use it even 
    # in initialize() if they call super first.
    @previous_game_state = $window.game_state_manager.current_game_state
    
    $window.game_state_manager.inside_state = self
  end
  
  setup_trait(options)
end

Instance Attribute Details

#game_objects ⇒ Object

Returns the value of attribute game_objects


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# File 'lib/chingu/game_state.rb', line 60

def game_objects
  @game_objects
end

#game_state_manager ⇒ Object

Returns the value of attribute game_state_manager


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# File 'lib/chingu/game_state.rb', line 60

def game_state_manager
  @game_state_manager
end

#options ⇒ Object (readonly)

Returns the value of attribute options


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# File 'lib/chingu/game_state.rb', line 59

def options
  @options
end

#previous_game_state ⇒ Object

Returns the value of attribute previous_game_state


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# File 'lib/chingu/game_state.rb', line 60

def previous_game_state
  @previous_game_state
end

Class Method Details

.trait(trait, options = {}) ⇒ Object Also known as: has_trait

Adds a trait or traits to a certain game class Executes a standard ruby “include” the specified module


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# File 'lib/chingu/game_state.rb', line 70

def self.trait(trait, options = {})
  
  if trait.is_a?(::Symbol) || trait.is_a?(::String)
    ## puts "trait #{trait}, #{options}"
    begin
      # Convert user-given symbol (eg. :timer) to a Module (eg. Chingu::Traits::Timer)
      mod = Chingu::Traits.const_get(Chingu::Inflector.camelize(trait))
      
      # Include the module, which will add the containing methods as instance methods
      include mod
               
      # Does sub-module "ClassMethods" exists?
      # (eg: Chingu::Traits::Timer::ClassMethods)
      if mod.const_defined?("ClassMethods")
        # Add methods in scope ClassMethods as.. class methods!
        mod2 = mod.const_get("ClassMethods")
        extend mod2
      
        # If the newly included trait has a initialize_trait method in the ClassMethods-scope:
        # ... call it with the options provided with the trait-line.
        if mod2.method_defined?(:initialize_trait)
          initialize_trait(options)
        end
      end
    rescue
      puts $!
    end
  end
end

.traits(*traits) ⇒ Object Also known as: has_traits 


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# File 'lib/chingu/game_state.rb', line 101

def self.traits(*traits)
  Array(traits).each { |trait| trait trait }
end

Instance Method Details

#button_down(id) ⇒ Object

Called when a button is pressed and a game state is active


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# File 'lib/chingu/game_state.rb', line 154

def button_down(id)
  dispatch_button_down(id, self)
  @input_clients.each { |object| dispatch_button_down(id, object) unless object.paused? } if @input_clients
end

#button_up(id) ⇒ Object

Called when a button is released and a game state active


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# File 'lib/chingu/game_state.rb', line 162

def button_up(id)
  dispatch_button_up(id, self)
  @input_clients.each { |object| dispatch_button_up(id, object) unless object.paused? }   if @input_clients
end

#close ⇒ Object

Closes game state by poping it off the stack (and activating the game state below)


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# File 'lib/chingu/game_state.rb', line 193

def close
  pop_game_state
end

#close_game ⇒ Object

Closes main window and terminates the application


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# File 'lib/chingu/game_state.rb', line 200

def close_game
  $window.close
end

#draw ⇒ Object

Calls Draw on each game object that has current game state as parent (created inside that game state)


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# File 'lib/chingu/game_state.rb', line 181

def draw
  @game_objects.draw
end

#draw_trait ⇒ Object 


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# File 'lib/chingu/game_state.rb', line 188

def draw_trait;end

#filename ⇒ Object

Returns a filename-friendly string from the current class-name

“Level19” -> “level19” “BigBossLevel” -> “big_boss_level”


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# File 'lib/chingu/game_state.rb', line 142

def filename
  Chingu::Inflector.underscore(self.class.to_s)
end

#setup ⇒ Object 


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# File 'lib/chingu/game_state.rb', line 147

def setup
  # Your game state setup logic here.
end

#setup_trait(options) ⇒ Object

Placeholder for trait-system to override


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# File 'lib/chingu/game_state.rb', line 186

def setup_trait(options);end

#to_s ⇒ Object 


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# File 'lib/chingu/game_state.rb', line 132

def to_s
  self.class.to_s
end

#to_sym ⇒ Object

An unique identifier for the GameState-class, Used in game state manager to keep track of created states.


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# File 'lib/chingu/game_state.rb', line 128

def to_sym
  self.class.to_s.to_sym
end

#trait_options ⇒ Object 


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# File 'lib/chingu/game_state.rb', line 64

def trait_options; self.class.trait_options; end

#update ⇒ Object

Calls update on each game object that has current game state as parent (created inside that game state)


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# File 'lib/chingu/game_state.rb', line 170

def update
  dispatch_input_for(self)
  
  @input_clients.each { |game_object| dispatch_input_for(game_object) unless game_object.paused? }      
  
  @game_objects.update
end

#update_trait ⇒ Object 


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# File 'lib/chingu/game_state.rb', line 187

def update_trait;end