module VideoAnimationHelpers
  def ease_in_out(t)
    t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t
  end

  def ease_out_bounce(t)
    if t < 1/2.75
      7.5625 * t * t
    elsif t < 2/2.75
      7.5625 * (t -= 1.5/2.75) * t + 0.75
    elsif t < 2.5/2.75
      7.5625 * (t -= 2.25/2.75) * t + 0.9375
    else
      7.5625 * (t -= 2.625/2.75) * t + 0.984375
    end
  end

  def ease_out_expo(t)
    t == 1 ? 1 : 1 - (2 ** (-10 * t))
  end
end