bacteria(player).rb

require 'actor'

class Bacteria < Actor
  has_behaviors :graphical, :updatable, :physical => {
    :shape => :circle,
    :mass => 10,
    :radius => 45,
    :friction => 1.7,
    :moment => 150 
  }

  attr_accessor :move_left, :move_right, :move_forward, :move_back
  def setup
    super
    @speed = 200
    @turn_speed = 100

    i = input_manager
    i.while_key_pressed(:left,self,:move_left)
    i.while_key_pressed(:right,self,:move_right)
    i.while_key_pressed(:up,self,:move_forward)
    i.while_key_pressed(:down,self,:move_back)

  end

  def update(time)
    physical.body.reset_forces

    if move_left
      physical.body.t -= @turn_speed * time
    end

    if move_right
      physical.body.t += @turn_speed * time
    end

    if move_back
      val = physical.body.a
      move_vec = CP::Vec2.new(Math::cos(val), Math::sin(val)) * time * @speed * 0.5

      physical.body.apply_force(-move_vec, ZERO_VEC_2) 
    end

    if move_forward
      val = physical.body.a
      move_vec = CP::Vec2.new(Math::cos(val), Math::sin(val)) * time * @speed

      physical.body.apply_force(move_vec, ZERO_VEC_2) 
    end
  end
end

  

demo_stage_cs.rb

require 'physical_stage'
class DemoStage < PhysicalStage
  GRAVITY = 9
  DAMPING = 0.7

  def setup
    super

    space.iterations = 5
    space.damping = DAMPING
    space.gravity = vec2(0,GRAVITY)

    @svg_doc = resource_manager.load_svg @opts[:file]

    @score = create_actor :score, :x => 10, :y => 10
    create_actor :logo, :x => 10, :y => 660

    create_actor :background

    dynamic_actors = create_actors_from_svg @svg_doc

    create_actor :svg_actor, :name => :ground, :svg_doc => @svg_doc

    @bacteria = dynamic_actors[:bacteria]

    create_actor :red_bloodcell, :x => 220, :y => 500
    create_actor :white_bloodcell, :x => 220, :y => 400

    viewport.follow @bacteria

    space.add_collision_func(:bacteria, :white_bloodcell) do |b, wc|
      shippy = director.find_physical_obj b
      puts "DEAD"
      sleep 2
      fire :restart_stage
    end

    space.add_collision_func(:bacteria, :red_bloodcell) do |b, rc|
      cell = director.find_physical_obj rc
      if cell.alive?
        puts "got one!"
        sound_manager.play_sound :splat
        cell.remove_self 
      end
    end
  end

  def curtain_up
    sound_manager.play_music :current_rider
  end

  def draw(target)
    target.fill [25,25,25,255]
    super
  end
end

red_bloodcell.rb

require 'actor'

class RedBloodcell < Actor
  has_behaviors :graphical, :updatable, :layered => {:layer => 2},
    :physical => {
      :shape => :circle,
      :mass => 10,
      :radius => 45,
      :friction => 1.7,
      :moment => 150 
    }
  
  def setup
    # register for events here
    # or pull stuff out of @opts
  end

  def update(time)
  end
end

stage_config.yml

:stages: 
  - :demo:
      :file: nose