Contents

# keeps track of an image for you based on the actor's class, and
# current action, and frame num
# by default it expects images to be:
# data/graphics/actor_type/action/01..n.png
Behavior.define :animated do
  requires :resource_manager, :director
  setup do
    @images = {}
    @frame_update_time = @opts[:frame_update_time]
    @frame_update_time ||= 60
    @frame_time = 0

    # all animated actors have to have an idle animation
    # data/graphics/ship/idle/1.png
    @frame_num = 0

    actor.has_attributes action: :idle, 
                         animating: true
    actor.has_attributes :image, :width, :height

    actor.when :action_changed do |old_action, new_action|
      action_changed old_action, new_action
      actor.animating = @images[new_action].size > 1
    end

    action_changed nil, actor.action

    director.when :update do |time|
      if actor.animating
        @frame_time += time
        if @frame_time > @frame_update_time
          next_frame
          @frame_time = @frame_time-@frame_update_time
        end
        set_image
      end
    end
  end

  helpers do
    def next_frame
      action_set = @images[actor.action]
      @frame_num = (@frame_num + 1) % action_set.size unless action_set.nil?
    end

    def action_changed(old_action, new_action)
      @images[new_action] ||= resource_manager.load_animation_set actor, new_action
      @frame_num = 0
      set_image
    end

    def set_image
      action_set = @images[actor.action]
      raise "unknown action set #{actor.action} for #{actor}" if action_set.nil?

      image = action_set[@frame_num]
      actor.image = image
      actor.width = image.width
      actor.height = image.height
    end
  end


end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
gamebox-0.4.0.rc5	lib/gamebox/behaviors/animated.rb
gamebox-0.4.0.rc4	lib/gamebox/behaviors/animated.rb
gamebox-0.4.0.rc3	lib/gamebox/behaviors/animated.rb
gamebox-0.4.0.rc2	lib/gamebox/behaviors/animated.rb
gamebox-0.4.0.rc1	lib/gamebox/behaviors/animated.rb