GoogleVisualr::Gauge Creation Example

example_controller.rb

# http://code.google.com/apis/visualization/documentation/gallery/gauge.html#Example
def gauge

  @chart = GoogleVisualr::Gauge.new
  @chart.add_column('string'  , 'Label')
  @chart.add_column('number'  , 'Value')
  @chart.add_rows(3)
  @chart.set_value(0, 0, 'Memory' )
  @chart.set_value(0, 1, 80)
  @chart.set_value(1, 0, 'CPU'    )
  @chart.set_value(1, 1, 55)
  @chart.set_value(2, 0, 'Network')
  @chart.set_value(2, 1, 68);

  options = { :width => 400, :height => 120, :redFrom => 90, :redTo => 100, :yellowFrom => 75, :yellowTo => 90, :minorTicks => 5 }
  options.each_pair do | key, value |
    @chart.send "#{key}=", value
  end

end

gauge.html.erb

<div id='chart'></div>
<%= @chart.render('chart') %>