app/systems/update_boid_position.rb


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FF::Scn::BoidRules.add(
  FF::Sys.new('UpdateBoidPosition', priority: 98) do
    FF::Cmp::Boid.each do |boid|
      boid.vx += boid.cx
      boid.vy += boid.cy
      boid.x += boid.vx
      boid.y += boid.vy

    end
  end
)