GoogleVisualr Gem - Bubble Chart Creation Example

controller.rb

# http://code.google.com/apis/chart/interactive/docs/gallery/bubblechart.html
def bubble_chart

  data_table = GoogleVisualr::DataTable.new
  data_table.new_column('string', 'ID')
  data_table.new_column('number', 'Life Expectancy')
  data_table.new_column('number', 'Fertility Rate')
  data_table.new_column('string', 'Region')
  data_table.new_column('number', 'Population')
  data_table.add_rows( [
    ['CAN',    80.66,              1.67,      'North America',  33739900],
    ['DEU',    79.84,              1.36,      'Europe',         81902307],
    ['DNK',    78.6,               1.84,      'Europe',         5523095],
    ['EGY',    72.73,              2.78,      'Middle East',    79716203],
    ['GBR',    80.05,              2,         'Europe',         61801570],
    ['IRN',    72.49,              1.7,       'Middle East',    73137148],
    ['IRQ',    68.09,              4.77,      'Middle East',    31090763],
    ['ISR',    81.55,              2.96,      'Middle East',    7485600],
    ['RUS',    68.6,               1.54,      'Europe',         141850000],
    ['USA',    78.09,              2.05,      'North America',  307007000]
  ])
  
  opts    = {
     :width => 800, :height => 500,
     :title => 'Correlation between life expectancy, fertility rate and population of some world countries (2010)',
     :hAxis => { :title => 'Life Expectancy' },
     :vAxis => { :title => 'Fertility Rate'  },
     :bubble => { :textStyle => { :fontSize => 11 } }
   }
   @chart = GoogleVisualr::Interactive::BubbleChart.new(data_table, opts)

end

view.html.erb

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