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rubygruff

Stacked Bar - Gruff Graph

I need to generate a Stacked Bar Graph using Gruff. I have tried with the following code: 

require 'rubygems'
require 'gruff'

g = Gruff::StackedBar.new('450x450') 

g.sort = false
g.maximum_value = 100 
g.minimum_value = 0 
g.y_axis_increment = 10

g.title = 'Quarterly Exams'

g.data('English',20,30,40)
g.data('Maths',10,20,30)
g.sort = false 

g.write('quarterly_progress.png')

But, this throws an error saying wrong number of arguments. I want a stacked bar graph with showing three values.

Solution

  • Just put values inside aray like this:

    g.data('English',[20,30,40])                                   
g.data('Maths',  [10,20,30])

    See gruff documentation on rubyforge: http://gruff.rubyforge.org/. Gruff::Base#data