Module: Chingu::Helpers::GameObject

Extended by:
Forwardable
Included in:
Console, GameState, Window
Defined in:
lib/chingu/helpers/game_object.rb

Overview

Convenience-methods for classes that hold game objects Mixed into Chingu::Window and Chingu::GameState

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#game_objects ⇒ Object (readonly)

Returns the value of attribute game_objects


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# File 'lib/chingu/helpers/game_object.rb', line 34

def game_objects
  @game_objects
end

Instance Method Details

#game_objects_of_class(klass) ⇒ Object

Fetch game objects of a certain type/class


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# File 'lib/chingu/helpers/game_object.rb', line 46

def game_objects_of_class(klass)
  @game_objects.select { |game_object| game_object.is_a? klass }
end

#load_game_objects(options = {}) ⇒ Object

Creates game objects from a Chingu-spezed game objects file (created with game state 'Edit')


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# File 'lib/chingu/helpers/game_object.rb', line 53

def load_game_objects(options = {})
  file = options[:file] || self.filename + ".yml"
  debug = options[:debug]
  except = Array(options[:except]) || []
  
  require 'yaml'
  
  puts "* Loading game objects from #{file}" if debug
  if File.exists?(file)
    objects = YAML.load_file(file)
    objects.each do |object|
      object.each_pair do |klassname, attributes|
        begin
          klass = Object
          names = klassname.split('::')
          names.each do |name|
            klass = klass.const_defined?(name) ? klass.const_get(name) : klass.const_missing(name)
          end
          unless klass.class == "GameObject" && !except.include?(klass)
            puts "Creating #{klassname.to_s}: #{attributes.to_s}" if debug
            object = klass.create(attributes)
            object.options[:created_with_editor] = true if object.options
          end
        rescue => e
          puts "Couldn't create class '#{klassname}' because: #{e}"
          #raise # I suggest this re-raise the error.
        end
      end
    end
  end
end

#save_game_objects(options = {}) ⇒ Object

Save given game_objects to a file. Hashoptions

:file - a String, name of file to write to, default is current game_state class name. :game_objects - an Array, game objects to save :classes - an Array, save only game objects of theese classes

NOTE: To save a color do: :color => game_object.color.argb


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# File 'lib/chingu/helpers/game_object.rb', line 94

def save_game_objects(options = {})
  #
  # TODO: Move this to GameObjectList#save ?
  #
  file = options[:file] || "#{self.class.to_s.downcase}.yml"
  game_objects = options[:game_objects]
  classes = options[:classes]
  attributes = options[:attributes] || [:x, :y, :angle, :zorder, :factor_x, :factor_y, :alpha]
  
  require 'yaml'
  objects = []
  game_objects.each do |game_object|
    # Only save specified classes, if given.
    next if classes and !classes.empty? and !classes.include?(game_object.class)
    
    attr_hash = {}
    attributes.each do |attr| 
      begin
      attr_hash[attr] = game_object.send(attr)
      rescue NoMethodError
        # silently ignore attributes that doesn't exist on the particular game object
      end
    end
    objects << {game_object.class.to_s => attr_hash}
  end

  File.open(file, 'w') { |out| YAML.dump(objects, out) }
end