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Ambling is a rails plugin makes it easy to generate XML needed by the wonderfully slick Amcharts.
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init.rb

README

#
# Ambling is a rails plugin makes it easy to generate XML needed by the wonderfully slick
# Amcharts[http://www.amcharts.com/].
#
# Amcharts has two kinds of XML: the data xml and the settings xml.  Ambling can help with both.
# 
# To install, do the usual rails incancation:
#    ruby script/plugin install svn://rubyforge.org//var/svn/ambling/trunk
#
# Ambling expects amcharts to be installed under public/amcharts.  Put the
# licence key (if any), swf files, fonts and plugins directories under here
#
#
# Amcharts uses swfobject.js, so put that in public/javascripts and include it
# in your layout.  It does not work with swfobject version 2.x so you'll need
# to find swfobject 1.x
# 
# Ambling uses expressinstall.swf by default, so put that in public/amcharts.
#
#
#
# Ambling is also now on github: http://github.com/ahobson/ambling/tree/master
#
# Examples:
# 
# In your controller, generate the data xml for a pie chart
#  def pie_data
#    chart = Ambling::Data::Pie.new
#    FavoriteColor.count(:color, :group => :color).each do |data|
#      chart.slices << Ambling::Data::Slice.new(data.last, :title => data.first,
#                                              :url => favorite_colors_path(:color => data.first))
#    end
#    render :xml => chart.to_xml
#  end
#
# In your view, embed the flash and customize the settings
#
#   <%=
#   ambling_chart(:pie,  :data_file => url_for(:action => 'pie_data', :escape => false),
#                           :id => 'pie_data', :width => 290, :height => 200,
#                           :chart_settings => Ambling::Pie::Settings.new({
#                             :pie => {
#                               :x => 110,
#                               :y => 110,
#                               :radius => 80,
#                               :colors => '#B40000,#F7941D,#0265AC',
#                               :outline_color => '#000000',
#                               :outline_alpha => 50,
#                             },
#                             :animation => {
#                               :pull_out_on_click => false,
#                             },
#                             :data_labels => {
#                               :show => cdata_section("<b>{value}</b>"), :radius => -30,
#                             },
#                             :legend => {
#                               :enabled => true, :x => 195, :y => 20, :width => 100, :text_color => '#000',
#                               :max_columns => 1, :spacing => 2, :text_size => 10,
#                               :key => {:size => 10}
#                             },
#                             :labels => {
#                               :label =>
#                                 {:x => 40, :y => 5, :text => cdata_section("<b>Favorite Colors</b>"),
#                                   :text_size => 16, :text_color => '#0265AC'},
#                             }
#                           }).to_xml) do
#                       content_tag('p', "To see this page properly, you need to upgrade your Flash Player")
#   end
#   %>
#
# How about a combo bar and line graph?
#
# In your controller:
#   def graph_data
#     avg_attendence = Movies.find_average_attendence_last_thirty_days
#     colors = %w{#B40000 #F7941D #0265AC #DF5858 #FFC580 #6FAFF3 #5AAB6D #E99393 #9DCFA9 #A4CBF3}
#     chart = Ambling::Data::ColumnChart.new
#     chart.graphs << Ambling::Data::LineGraph.new([], :title => "Average Attendence", :color => '#000000')
#     avg_attendence.each do |day,avg_attendence|
#       chart.series << Ambling::Data::Value.new(day.to_s(:pretty_day), :xid => day.to_i)
#       chart.graphs.last << Ambling::Data::Value.new(avg_attendence, :xid => day.to_i)
#     end
#     all_movie_names = Movies.find_movie_names
#     all_movie_names.each_with_index do |movie_name, i|
#       chart.graphs << Ambling::Data::ColumnGraph.new([], :title => movie_name, :color => colors[i])
#       movie_attendence = Movies.find_attendence_by_name(movie_name)
#       movie_attendence.each do |day, attendence|
#         chart.graphs.last << Ambling::Data::Value.new(attendence, :xid => day.to_i)
#       end
#     end
#      
#     render :xml => chart.to_xml
#   end
#
# In your view:
#
#   <%=
#   ambling_chart(:column,  :data_file => url_for(:action => 'graph_data', :escape => false),
#                           :id => "graph_data", :width => 900, :height => 250,
#                           :chart_settings => Ambling::Column::Settings.new({
#                             :column => {
#                               :type => "stacked", :width => 90, :spacing => 5,
#                               :balloon_text => "{value} people attended the movie {title} on {series}"
#                             },
#                             :grid => {
#                               :category => {:alpha => 0}, :value => {:alpha => 10}
#                             },
#                             :values => {
#                               :category => {:enabled => true, :frequency => 3}
#                             },
#                             :plot_area => {
#                               :margins => {:left => 30, :top => 40, :right => 100, :bottom => 40}
#                             },
#                             :legend => {
#                               :enabled => true, :x => 805, :y => 20, :width => 100, :text_color => '#000',
#                               :max_columns => 1, :spacing => 2, :text_size => 10,
#                               :key => {:size => 10}
#                             },
#                             :labels => {
#                               :label => [
#                                 {:x => 350, :y => 5, :text => cdata_section("<b>Movie Attendence</b>"),
#                                   :text_size => 16, :text_color => '#0265AC'}
#                               ]
#                             },
#                             :graphs => {
#                               :graph => [
#                                 {:type => 'line', :gid => 1, :width => 3}
#                               ]
#                             }
#                           }).to_xml) do
#                       content_tag('p', "To see this page properly, you need to upgrade your Flash Player")
#   end
#   %>
# 
# Here's a column example.
#
# In your controller:
#
#   def column_data
#     colors = %w{#B40000 #F7941D #0265AC}
#     chart = Ambling::Data::ColumnChart.new
#     chart.series << Ambling::Data::Value.new(1, :xid => 1)
#     [["Chocolate", 55], ["Ice Cream", 34], ["Cookies", 22]].each_with_index do |kv, i|
#       chart.graphs << Ambling::Data::ColumnGraph.new([], :gid => i, :title => kv.first, :color => color[i])
#       chart.graphs.last << Ambling::Data::Value.new(kv.last, {:xid => 1})
#     end
#     render :xml => chart.to_xml
#    end
# 
# In your view:
#
#   <%=
#   ambling_chart(:column,  :data_file => url_for(:action => 'column_data', :escape => false),
#                           :id => 'column_data', :width => 290, :height => 200,
#                           :chart_settings => Ambling::Column::Settings.new({
#                             :column => {
#                               :type => "bar", :width => 97, :spacing => 0,
#                               :balloon_text => cdata_section("{value} people bought {title}")
#                             },
#                             :grid => {
#                               :category => {:alpha => 0}, :value => {:alpha => 10}
#                             },
#                             :values => {
#                               :category => {:enabled => false}
#                             },
#                             :plot_area => {
#                               :margins => {:left => 40, :top => 40, :right => 100, :bottom => 40}
#                             },
#                             :legend => {
#                               :enabled => true, :x => 195, :y => 20, :width => 100, :text_color => '#000',
#                               :max_columns => 1, :spacing => 1, :text_size => 10,
#                               :key => {:size => 10}
#                             },
#                             :labels => {
#                               :label => [
#                                 {:x => 20, :y => 5, :text => cdata_section("<b>Dessert</b>"),
#                                   :text_size => 16, :text_color => '#0265AC'},
#                                 {:x => 30, :y => 170, :text => "Sweet Sales", :align => "center", :width => 180,
#                                   :text_size => 12}
#                               ]
#                             }
#                           }).to_xml) do
#                       content_tag('p', "To see this page properly, you need to upgrade your Flash Player")
#   end
#   %>

# Thanks to the ziya plugin for inspiration

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