def initialize(frame, options={})
      @gap_depth = nil
      @view_3D = View3D.new({:r_ang_ax=>1}.merge(options))
      super(frame, options)
      axes.add_axis :ser_axis, SerAxis
    end
Creates a new line chart object
@option options [String] gap_depth
@see Chart
@see lineChart
@see View3D