shoes minsky's circle algorithm animation glitches

minsky_circle_algorithm_glitches.rb

Shoes.app do
  epsilon = 1.0/16
  offset = 250
  initial_x = 100
  initial_y = 100

  fill red


  @animate = animate (2) do |i|
    epsilon = 10.0 / (i)
    x = initial_x
    y = initial_y

    shape do
      move_to(x + offset,y + offset)
      100.times do
        x = x - epsilon * y
        y = y + epsilon * x
        line_to(x + offset,y + offset)
      end
    end


    @animate.stop if i > 160
  end
end