def initialize(frame, options={})
      @vary_colors = true
      super(frame, options)
      @series_type = PieSeries
      @view_3D = View3D.new({:rot_x =>30, :perspective=>30}.merge(options))
      @d_lbls = nil
    end
Creates a new pie chart object
@param [GraphicFrame] frame The workbook that owns this chart.
@option options [Cell, String] title
@option options [Boolean] show_legend
@option options [Symbol] grouping
@option options [String] gap_depth
@option options [Integer] rot_x
@option options [String] h_percent
@option options [Integer] rot_y
@option options [String] depth_percent
@option options [Boolean] r_ang_ax
@option options [Integer] perspective
@see Chart
@see View3D