ROFLBALT BuildingGenerator

gistfile1.rb

class BuildingGenerator
  def initialize world, background
    @world = world
    @background = background
  end
  def destroy_if_necessary
    while @world.buildings.any? && @world.buildings.first.x < -100
      @world.buildings.shift
    end
  end
  def generate_if_necessary
    while (b = @world.buildings.last).x < @world.horizon
      @world.buildings << build(
        b.right_x + minimium_gap + rand(24),
        next_y(b),
        rand(40) + 40
      )
    end
  end
  def minimium_gap; 16 end
  def maximum_height_delta; 10 end
  def minimum_height_clearance; 12; end
  def next_y previous_building
    p = previous_building
    delta = 0
    while delta.abs <= 1
      delta = maximum_height_delta * -1 + rand(2 * maximum_height_delta + 1)
    end
    [25, [previous_building.y - delta, minimum_height_clearance].max].min
  end
  def build x, y, width
    Building.new x, y, width, @background
  end
end