use google API instead of highcharts due to licensing

Gemfile

@@ -23,7 +23,7 @@ gem 'haml', '3.0.25'
 gem 'will_paginate', '3.0.pre2'
 
 #Statistics
-gem 'lazy_high_charts', :git => 'git://github.com/xiaods/lazy_high_charts.git', :ref => 'c63f49ce10e1dad8a0b7'
+gem 'googlecharts'
 
 #Uncatagorized
 gem 'roxml', :git => 'git://github.com/Empact/roxml.git', :ref => '7ea9a9ffd2338aaef5b0'

Gemfile.lock

@@ -184,6 +184,7 @@ GEM
     gem_plugin (0.2.3)
     gherkin (2.3.3)
       json (~> 1.4.6)
+    googlecharts (1.6.0)
     haml (3.0.25)
     hashie (0.4.0)
     highline (1.6.1)
@@ -382,6 +383,7 @@ DEPENDENCIES
   fastercsv (= 1.5.4)
   fixture_builder (~> 0.2.0)
   fog
+  googlecharts
   haml (= 3.0.25)
   http_accept_language!
   jammit (= 0.5.4)

app/controllers/statistics_controller.rb

@@ -9,15 +9,17 @@ class StatisticsController < ApplicationController
   def show
     @statistic = Statistic.where(:id => params[:id]).first
     @distribution = @statistic.distribution_as_array
-    @h = LazyHighCharts::HighChart.new('graph') do |f|
-      f.series(:name=>'Posts on day', :data=> @distribution)
-      f.options[:x_axis][:categories] = (0..@distribution.length-1).to_a.map{|ind| ind%10==0 ? ind : ' '}
+    @google_chart_url = Gchart.line( :size => '700x400', 
+                                     :title => "Posts on day",
+                                     :bg => 'efefef',
+                                     :legend => ['Posts'],
+                                     :data => @distribution,
+                                     :max_value => 1,
+                                     :axis_with_labels => ['x','y'],
+                                     :axis_labels => [(0..@distribution.length-1).to_a.map{|d| d%10==0 ? d : ''},
+                                                      (0..10).to_a.map!{|int| int.to_f/10}]
+                                   )
 
-      f.options[:title] = "Posts on day"
-      f.options[:y_axis] = {:max => 1}
-      f.options[:y_axis][:title] = {:text => "% Users"}
-      f.options[:x_axis][:title] = {:text => "Posts"}
-    end
   end
 
   def generate_single

app/views/statistics/show.html.haml

@@ -2,15 +2,11 @@
 -#   licensed under the Affero General Public License version 3 or later.  See
 -#   the COPYRIGHT file.
 
-- content_for :head do
-  = javascript_include_tag 'vendor/highcharts.js'
+%h3 Viewing statistic
 
-%h1 Viewing statistic
-
-%h3
+%h2
   = "Users in sample: #{@statistic.users_in_sample}"
-
-  = high_chart("posts_per_day", @h)
+= image_tag(@google_chart_url)
 
 %br
 = link_to 'all statistics', statistics_path