Class: SpaceInvaders::InvaderRow

Inherits:
Base
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/space_invaders/invaders/invader_row.rb

Constant Summary collapse

X_POSITIONS = 
[40, 110, 180, 250, 320, 390, 460, 530]

Instance Attribute Summary collapse

Attributes inherited from Base

#app

Instance Method Summary collapse

Methods inherited from Base

#game_status

Constructor Details

#initialize(app, y_position, invader_clazz) ⇒ InvaderRow

Returns a new instance of InvaderRow.



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# File 'lib/space_invaders/invaders/invader_row.rb', line 13

def initialize app, y_position, invader_clazz
  super(app)
  @y_position = y_position
  @direction = :right
  @invader_clazz = invader_clazz
  @invaders = []
  X_POSITIONS.each do |x_position|
    @invaders << invader_clazz.new(app, x_position, y_position)
  end
end

Instance Attribute Details

#direction ⇒ Object

Returns the value of attribute direction.



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# File 'lib/space_invaders/invaders/invader_row.rb', line 8

def direction
  @direction
end

#invader_clazz ⇒ Object (readonly)

Returns the value of attribute invader_clazz.



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# File 'lib/space_invaders/invaders/invader_row.rb', line 9

def invader_clazz
  @invader_clazz
end

Instance Method Details

#check_collision(bullets) ⇒ Object 



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# File 'lib/space_invaders/invaders/invader_row.rb', line 42

def check_collision(bullets)
  @invaders.delete_if do |invader|
    if invader.collides_with? bullets
      app.score_tracker.increase_by(invader.points)
      app.sounds.play_invader_hit!
    end
  end
end

#draw ⇒ Object 



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# File 'lib/space_invaders/invaders/invader_row.rb', line 30

def draw
  @invaders.each {|invader| invader.draw }
end

#farmost_left_position ⇒ Object 



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# File 'lib/space_invaders/invaders/invader_row.rb', line 38

def farmost_left_position
  @invaders.min_by {|invader| invader.x_position }.x_position
end

#farmost_right_position ⇒ Object 



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# File 'lib/space_invaders/invaders/invader_row.rb', line 34

def farmost_right_position
  @invaders.max_by {|invader| invader.x_position }.x_position
end

#update(direction, y_offset) ⇒ Object 



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# File 'lib/space_invaders/invaders/invader_row.rb', line 26

def update direction, y_offset
  @invaders.each {|invader| invader.update direction, y_offset }
end