GoogleVisualr Gem - Combo Chart Creation Example

controller.rb

# http://code.google.com/apis/chart/interactive/docs/gallery/combochart.html
def combo_chart

  data_table = GoogleVisualr::DataTable.new
  data_table.new_column('string', 'month'       )
  data_table.new_column('number', 'Bolivia'     )
  data_table.new_column('number', 'Ecuador'     )
  data_table.new_column('number', 'Madagascar'  )
  data_table.new_column('number', 'Papua Guinea')
  data_table.new_column('number', 'Rwanda'      )
  data_table.new_column('number', 'Avarage'     )
  data_table.add_rows( [
    ['2004/05', 165, 938  , 522, 998  , 450, 614.6],
    ['2005/06', 135, 1120 , 599, 1268 , 288, 682  ],
    ['2006/07', 157, 1167 , 587, 807  , 397, 623  ],
    ['2007/08', 139, 1110 , 615, 968  , 215, 609.4],
    ['2008/09', 136, 691  , 629, 1026 , 366, 569.6]
  ] )

  opts   = { :width => 700, :height => 400, :title => 'Monthly Coffee Production by Country', :vAxis => {:title => 'Cups'}, :hAxis => {:title => 'Month'}, :seriesType => 'bars', :series => {'5' => {:type => 'line'}} }
  @chart = GoogleVisualr::Interactive::ComboChart.new(data_table, opts)

end

view.html.erb

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