Generate a graph using Gruff
This Ruby code produced a graph using gruff. The output shows a line graph [twitxr.com] for the different fruits. Source code origin: Gruff Update With Bar Graphs | Ruby on Rails for Newbies [rubyonrails.com]
Note: I executed the code within an irb session on my Gentoo box. With Gentoo, Gruff was installed [gentoo-portage.com] using the command emerge -va gruff. I tried installing it on Ubuntu but ran into some difficulty, even with help from the article install rmagick ubuntu [dzone.com].
*udpate 21:48 24-Feb*
The following code does exactly as the same code above, however it uses XML to separate the data from the process, making it easier and more efficient to build graphs.
file: my_fruit.xml
Reference: gruff's gruff-0.2.9 Documentation [rubyforge.org]
to ruby rmagick image ubuntu gentoo magick graph chart gruff by jrobertson on Feb 24, 2008
require 'gruff' g = Gruff::Line.new g.title = "My Graph" g.data("Apples", [1, 2, 3, 4, 4, 3]) g.data("Oranges", [4, 8, 7, 9, 8, 9]) g.data("Watermelon", [2, 3, 1, 5, 6, 8]) g.data("Peaches", [9, 9, 10, 8, 7, 9]) g.labels = {0 => '2003', 2 => '2004', 4 => '2005'} g.write('my_fruity_graph.png')
Note: I executed the code within an irb session on my Gentoo box. With Gentoo, Gruff was installed [gentoo-portage.com] using the command emerge -va gruff. I tried installing it on Ubuntu but ran into some difficulty, even with help from the article install rmagick ubuntu [dzone.com].
*udpate 21:48 24-Feb*
The following code does exactly as the same code above, however it uses XML to separate the data from the process, making it easier and more efficient to build graphs.
#!/usr/bin/ruby # file: xml2gruff.rb require 'rexml/document' require 'gruff' include REXML class Xml2Gruff def initialize(filename) file = File.new(filename, 'r') doc = Document.new(file) # get the title @title = doc.root.elements['summary/title'].text @record = Hash.new # get each record doc.root.elements.each('records/item') {|item| avalues = Array.new item.elements.each('values/value') { |value| avalues << value.text.to_i } @record[item.elements['label'].text] = avalues } # get the summary labels @labels = Hash.new doc.root.elements.each('summary/scale/label') {|l| @labels[l.elements['value'].text.to_i] = l.elements['title'].text} end def save_line_graph(filename) g = Gruff::Line.new g.title = @title @record.each {|label, data| g.data(label, data) } g.labels = @labels g.write(filename) end end if __FILE__ == $0 x2g = Xml2Gruff.new('my_fruit.xml') x2g.save_line_graph('my_fruit2.png') end
file: my_fruit.xml
<graph> <summary> <title>My Graph</title> <scale> <label><title>2003</title><value>0</value></label> <label><title>2004</title><value>2</value></label> <label><title>2005</title><value>4</value></label> </scale> </summary> <records> <item> <label>Apples</label> <values><value>1</value><value>2</value><value>3</value><value>4</value><value>4</value><value>3</value></values> </item> <item> <label>Oranges</label> <values><value>4</value><value>8</value><value>7</value><value>9</value><value>8</value><value>9</value></values> </item> <item> <label>Watermelon</label> <values><value>2</value><value>3</value><value>1</value><value>5</value><value>6</value><value>8</value></values> </item> <item> <label>Peaches</label> <values><value>9</value><value>9</value><value>10</value><value>8</value><value>7</value><value>9</value></values> </item> </records> </graph>
Reference: gruff's gruff-0.2.9 Documentation [rubyforge.org]
to ruby rmagick image ubuntu gentoo magick graph chart gruff by jrobertson on Feb 24, 2008
