Gruff

rubyonrails-talk
1

Hi! I am using Gruff as per the directions of http://nubyonrails.com/articles/2005/11/19/gruff-with-rails-typo-rewrite but it doesn’y show me the Graph. It only shows me the background image of that graph.

Here is the controller method for it:

def bar_graph_report built_array = g = Gruff::Pie.new(400) g.title = “Optionwise polling” g.font = File.expand_path(‘artwork/fonts/Vera.ttf’, RAILS_ROOT)

g.labels = { 0 => ‘Mon’, 2 => ‘Wed’, 4 => ‘Fri’, 6 => ‘Sun’ }

@poll = Poll.find(params[:id]) @total_votes = (@poll.option_one_count) + (@poll.option_two_count ) + (@poll.option_three_count) built_array[0] = ((@poll.option_one_count)/@total_votes) * 100 built_array[1] = ((@poll.option_two_count)/@total_votes) * 100 built_array[2] = ((@poll.option_three_count)/@total_votes) * 100 g.data(‘option wise voting’, built_array)

send_data(g.to_blob, :disposition => ‘inline’, :type => ‘image/png’, :filename => “bart_scores.png”)

end

What could be the problem? Thanks and regards, Swanand

2

Its been a while since I've looked at the docs for it. One thing is dont worry about calculating total votes. Also try feeding g.data one option at a time like so @poll.options do |option|    g.data(option.name, option.votes) end Hope this helps. - Richard