An example of 'charty' - a rails plugin for amcharts

action.html.haml

%h2 My Cool Chart
= charty :small_revenue_with_signups, {:month => Date.today.month, :year => Date.today.year}

small_revenue_with_signups.rb

chart :small_revenue_with_signups do |c|
  c.type             = :line

  ## Defines the font size & actual font to use. The size & background colours are used in the 
  ## the XML settings and in the HTML which is generated for this chart (unless overriden in the
  ## render).
  c.font             = 'Arial'
  c.font_size        = 11
  c.width            = 400
  c.height           = 180
  c.background_color = "#efefef"

  ## Various graph design settings & variables
  c.plot_area        = {:margins => {:left => 0, :top => 20, :right => 0, :bottom => 35}}
  c.axes             = {:x => {:color => "#cccccc", :width => 0}, :y_left => {:color => '#cccccc', :width => 2}}
  c.grid             = {:x => {:alpha => 0, :approx_count => 9}, :y_left => {:alpha => 0}, :y_right => {:alpha => 0}}
  c.indicator        = {:color => '#999999', :line_alpha => 50, :selection_color => '#0D8ECF', :selection_alpha => 20, :x_balloon_text_color => '#FFFFFF'}
  c.vertical_lines   = {:width => 70}
  c.legend           = { :enabled => false }
  
  ## Add a graph for showing the total number of signups on a specific day.
  c.add_graph "Signups", :color => "#cccccc", :color_hover => '#999999', :selected => false, :vertical_lines => true, :line_alpha => 0
  
  ## Add a graph for showing the total revenue collected on a specific day.
  c.add_graph "Revenue", :color => "#0D8ECF", :color_hover => '#0D8ECF',:selected => true, :line_width => 2, :axis => 'right'

  ## The title of the graph.
  c.add_label "Signups & Revenue", :x => 0, :y => 9, :align => 'right', :text_size => 10, :text_color => '#999999' do |v|
    "Signups & Revenue (#{Time.utc(v[:year], v[:month]).strftime('%B %Y')})"
  end
  
  ## Add axis points for each day of the month.
  c.add_axis_points('xaxis') { |v| (1..Time.days_in_month(v[:month], v[:year])).to_a }
  
  ## Add the number of account signups for each day of the month.
  c.add_data(1) { |v| Account.period_count(:daily, :signups_on, :month => v[:month], :year => v[:year]) }
  
  ## Add the total amount for invoices raised on each day of the month.
  c.add_data(2) { |v| Finance::Invoice.period_count(:daily, :raised_on, :month => v[:month], :year => v[:year], :sum => :total) }
end