GoogleVisualr Gem - Stepped Area Chart Creation Example

controller.rb

# http://code.google.com/apis/chart/interactive/docs/gallery/steppedareachart.html#Example
def stepped_area_chart

  data_table = GoogleVisualr::DataTable.new
  data_table.new_column('string'  , 'Director (Year)')
  data_table.new_column('number'  , 'Rotten Tomatoes')
  data_table.new_column('number' , 'IMDB')
  data_table.add_rows( [
    ['Alfred Hitchcock (1935)', 8.4,         7.9],
    ['Ralph Thomas (1959)',     6.9,         6.5],
    ['Don Sharp (1978)',        6.5,         6.4],
    ['James Hawes (2008)',      4.4,         6.2]
  ])

  opts   = { :width => 800, :height => 500, :title => "The decline of 'The 39 Steps'", :vAxis => { :title => 'Accumulated Rating'}, :isStacked => true }
  @chart = GoogleVisualr::Interactive::SteppedAreaChart.new(data_table, opts)

end

view.html.erb

<div id='chart'></div>
<%= render_chart @chart, 'chart' %>