DZone Snippets: chart code

Generate a graph using Gruff

jrobertson (James Robertson) — Sun, 24 Feb 2008 18:52:14 GMT

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]



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

Reference: gruff's gruff-0.2.9 Documentation [rubyforge.org]
gruff graphs for ruby by geoffrey grosenbach [topfunky.com]

Unicode chart

Minimiscience (Guildorn Tanaleth) — Thu, 05 Jul 2007 04:12:52 GMT

This PHP-enhanced HTML page will display the first 4,096 (unless you change it) Unicode characters in a neat table. Your browser's ability to render the characters properly may vary.







Unicode Chart











 for ($i=0; $i<256; $i++) { //DON'T try to generate the whole chart

  printf('', $i);

  for ($j=0; $j<16; $j++) {

   printf('', $i, $j);

  }

  echo "\n";

 }

?>


 0 1 2 3 4 5 6 7 8 9 A B C D E F
%04X &#x%X%X;

	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
%04X	&#x%X%X;

Java - JFreeChart Example

whitetiger () — Wed, 01 Nov 2006 19:03:27 GMT



import java.awt.Font;



import javax.swing.JFrame;

import javax.swing.JPanel;



import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartPanel;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.plot.PiePlot;

import org.jfree.data.general.DefaultPieDataset;



public class jfcExample extends JFrame

{

	private static final long serialVersionUID = 1L;

	

	private DefaultPieDataset dataset;

	private JFreeChart jfc;



	public jfcExample()

	{

		dataset = new DefaultPieDataset();

	}

	

	public void setValue(String title, Double numDouble)

	{

		dataset.setValue(title, numDouble);

	}

	

	public void setChar(String title)

	{

		jfc = ChartFactory.createPieChart(title, dataset, true, true, false);

		

		PiePlot pp = (PiePlot) jfc.getPlot();

		pp.setSectionOutlinesVisible(false);

		pp.setLabelFont(new Font("SansSerif", Font.PLAIN, 12));

		pp.setNoDataMessage("Nessun Dato Inserito");

		pp.setCircular(false);

		pp.setLabelGap(0.02);

	}

	

	private JPanel createPanel()

	{

		return new ChartPanel(jfc);

	}

	

	public void Show()

	{

		setContentPane(createPanel());

		setVisible(true);

	}

	

	public static void main(String[] args)

	{

		jfcExample j = new jfcExample();

		j.setTitle("Example Chart...");

		j.setSize(640, 430);

		

		j.setValue("UNO", new Double(20.0));

		j.setValue("DUE", new Double(10.0));

		j.setValue("TRE", new Double(20.0));

		j.setValue("QUATTRO", new Double(30.0));

		j.setValue("CINQUE", new Double(20.0));

		

		j.setChar("Example Chart...");

		

		j.Show();

	}

}

PHP last.fm chart creator

Alkine (Jurgen Strydom) — Wed, 27 Sep 2006 22:52:34 GMT

This code displays the Top 50 artists XML feed from last.fm in a nice presentable way on your website. Can easily be modified to work with any other feed from last.fm, find the full guide at http://www.strydominc.za.net/index.php?p=projectdetail&d=phplastfmchart



/**********************************************************************************************

www.strydominc.za.net

Created by Jurgen Strydom, 19-08-2006, jurgen.strydom@gmail.com

Read the readme.txt

Version 1.01, 05-09-2006

**********************************************************************************************/

?>





//User settings -> needs your attention

$user = "Alkine"; //Your username

$width = 700; //width of the list



//Code you should not worry about

$file = "http://ws.audioscrobbler.com/1.0/user/$user/topartists.xml";

$xml = simplexml_load_file("$file");

$big = $xml->artist[0]->playcount;

$total = count($xml->artist);

$factor =  $width /$big;

?>


 for ($k=0 ; $k<=$total - 1; $k++) {

 	$barlen = round(($xml->artist[$k]->playcount * $factor), 0);

 ?>




  }

  ?>

  
   
    






      
      
        		if ($barlen >= (($width + 100) /2)) {

			echo "", $xml->artist[$k]->playcount, " - ", $xml->artist[$k]->name ,"";

		}

		if (($barlen < (($width + 100) /2)) && ($barlen >= ($width / 3))) {

			echo "", $xml->artist[$k]->playcount ," -";

		}

		if ($barlen < ($width / 3)) {

			echo " ";

		}		

		?>
        		if ($barlen >= (($width + 100) /2)) {

			echo " ";

		}

		if (($barlen < (($width + 100) /2)) && ($barlen >= ($width / 3))) {

			echo " ", $xml->artist[$k]->name ,"";

		}

		if ($barlen < ($width / 3)) {

			echo "", $xml->artist[$k]->playcount, " - ", $xml->artist[$k]->name ,"";

		}		

		?>
      
    
  
  



/**********************************************************************************************

Changelog:



Version 1.01

Fixed a bug that caused the bar sizes to display incorrectly.



Version 1

First release.

**********************************************************************************************/

?>