# File karel/karel_window.rb, line 488
    def move_scale
      @canvas.delete(@code)
      if@isVertical
        x, y = scaler(street - 0.5, avenue + 0.5)
        @code = TkcLine.new(@canvas, x, y, x, y - scale_factor, :width => 2)
      else
        x, y = scaler(street + 0.5, avenue - 0.5)
        @code = TkcLine.new(@canvas, x, y, x + scale_factor, y, :width => 2)
      end
    end