Gruff graphs
The following are some good resource for how to use Gruff graphs:
The last one was HUGELY helpful:
def stats g = Gruff::Line.new(?580x210?) g.theme = { :colors => [?#ff6600?, ?#3bb000?, ?#1e90ff?, ?#efba00?, ?#0aaafd?], :marker_color => ?#aaa?, :background_colors => [?#eaeaea?, ?#fff?] }
g.hide_title = true
g.font = File.expand_path('path/to/font.ttf', RAILS_ROOT)
range = "created_at #{(12.months.ago.to_date..Date.today).to_s(:db)}"
@users = User.count(:all, :conditions => range, :group => "DATE_FORMAT(created_at, '%Y-%m')", :order =>"created_at ASC")
@votes = Vote.count(:all, :conditions => range, :group => "DATE_FORMAT(created_at, '%Y-%m')", :order =>"created_at ASC")
@bookmarks = Bookmark.count(:all, :conditions => range, :group => "DATE_FORMAT(created_at, '%Y-%m')", :order =>"created_at ASC")
# Take the union of all keys & convert into a hash {1 => "month", 2 => "month2"...}
# - This will be the x-axis.. representing the date range
months = (@users.keys | @votes.keys | @bookmarks.keys).sort
keys = Hash[*months.collect {|v| [months.index(v),v.to_s] }.flatten]
# Plot the data - insert 0's for missing keys
g.data("Users", keys.collect {|k,v| @users[v].nil? ? 0 : @users[v]})
g.data("Votes", keys.collect {|k,v| @votes[v].nil? ? 0 : @votes[v]})
g.data("Bookmarks", keys.collect {|k,v| @bookmarks[v].nil? ? 0 : @bookmarks[v]})
g.labels = keys
send_data(g.to_blob, :disposition => 'inline', :type => 'image/png', :filename => "site-stats.png")
end