Hey there, Have you ever heard about gruff ? Its a nice library for making beautiful graphs out of data from ruby.

Install

The name of the gem is gruff so add gem 'gruff' to your Gemfile and execute bundle install

Use it

I am going to build a line chart of counted data. The Data is managed by DataMapper The Table looks like this:

Counter Date
250 2014-06-01
200 2014-05-01
… … 
require 'gruff'

def gen_graph(table,color,size)
  label_index
  g = Gruff:Line.new(size)
  g.marker_font_size=15
  g.theme = {
    :colors => [color],
    :maker_color => '#CCCCCC',
    :font_color => 'Black',
    :background_color => 'White'
  }
  g.title=table.to_s + " Counter"
  data = []
  table.all.each do |row|
    data.push(row['counter'])
  end
  g.data table, data
  system("mkdir -p public/graphs")
  g.write("public/graphs/"+table.to_s.downcase+".png")
end

size=700
gen_graph(Water,"Blue",size)
gen_graph(Power,"Red",size)
gen_graph(Gas,"Yellow",size)