Ruby Graphing/chart libraries?

ruby-talk
1

Hi all,
            I'm trying to set up a Ruby/Rails app at work and for a
great deal of the pages I'll need to display graphs and charts of data.
Does anyone know of a simple package that can create bar, x-y plot, pie,
and other basic charts in a usable format? (I'm speaking gif, jpg, png.
I like the looks of the SVG::Graph library, but SVG support doesn't come
with any of the browsers yet.)

Thanks,
Chris

2

We are using ruby-gd [ http://raa.ruby-lang.org/project/ruby-gd/ ] and
ruby-gdchart
[ http://raa.ruby-lang.org/project/gdchart/ ] . ruby-gd is wrapper
arroung lingd
[ Short Term Loans | Boutell.co.uk | Borrow £50 - £2500 Instantly ] and ruby-gdchart is wrapper around gd
specially for graphs
(bar, pie etc.). Pretty easy to use. Just not enough docs and i couldnt make it
run on windows (maybe will work with cygwin, i tryed the mingw).
Sample code for cgi:

require "cgi"
require "GD"
require 'GDChart'

cgi = CGI.new
print cgi.header("type"=>"image/png")
gdc = GDChart.new

gdc.image_type = GDChart::PNG

gdc.title = "The Title"
gdc.title_size = GDChart::GIANT

gdc.xtitle = "X-axis"
gdc.ytitle = "Y-axis"

gdc.ExtColor = [ 0xFF3399, 0xFF9933, 0xFFEE33, 0x33FF33, 0x33FFCC, 0x9966FF ]
gdc.BGColor = 0xFFFFFF

data = [ 7, 11, 13, 17, 19, 23 ]
label = ['Value X','Value Y']

gdc.out_graph(600, 400, $stdout, GDChart::BAR3D, data.length, label, 1, data)

···

On Thu, 2 Dec 2004 09:33:14 +0900, Chris Williams <cwillia1@rochester.rr.com> wrote:

Does anyone know of a simple package that can create bar, x-y plot, pie,
and other basic charts in a usable format? (I'm speaking gif, jpg, png.

3

Chris Williams wrote:

Hi all,
            I'm trying to set up a Ruby/Rails app at work and for a
great deal of the pages I'll need to display graphs and charts of data.
Does anyone know of a simple package that can create bar, x-y plot, pie,
and other basic charts in a usable format? (I'm speaking gif, jpg, png.
I like the looks of the SVG::Graph library, but SVG support doesn't come
with any of the browsers yet.)

I've used gnuplot for this: http://ntecs.de/wee/ehf
(http://www.ntecs.de/blog/Blog/FirstAppUsingWee.rdoc\)

Below is the code snippet that generates the diagram using gnuplot.

Two other options are:

   gd-graph: http://www.ntecs.de/viewcvs/viewcvs/gd-graph/
   ploticus: http://www.ntecs.de/viewcvs/viewcvs/ruby-ploticus/

Regards,

   Michael

···

###############################################
   g = IO.popen("gnuplot", "w+")

   points1 =
   points2 =

   for i in 1..600
     points1 << [i, vg[i]]
     points2 << [i, vd[i]]
   end

   g.puts "set terminal png transparent small size 640,480 " +
   "xffffff x000000 x404040 " +
   "x0ff00f xf00f0f x66cdaa xcdb5cd " +
   "xadd8e6 x0000ff xdda0dd x9500d3"

   g.puts "set autoscale y"
   g.puts "set xrange [0:600]"
   g.puts "set xlabel 'Monate'"
   g.puts "set ylabel 'Euro'"
   g.puts "set grid"
   g.puts "set noborder"

   s = (["'1' 1"] + (60..600).to_enum(:step, 60).map {|i| "'#{i}' #{i}" }).join(",")
   g.puts "set xtics (#{s})"
   g.puts "set key on below"

   g.puts "plot '-' title 'Guthaben' with filledcurves, '-' title 'Darlehen' with filledcurves"
   g.puts points1.map{|v| v.join(" ")}.join("\n")
   g.puts "\ne\n"
   g.puts points2.map{|v| v.join(" ")}.join("\n")
   g.puts "\ne"

   g.close_write
   png = g.read
   File.open('test.png', 'w+') {|f| f << png}

4

> Does anyone know of a simple package that can create bar, x-y plot,

pie,

> and other basic charts in a usable format? (I'm speaking gif, jpg,

png.

We are using ruby-gd [ http://raa.ruby-lang.org/project/ruby-gd/ ] and
ruby-gdchart
[ http://raa.ruby-lang.org/project/gdchart/ ] . ruby-gd is wrapper
arroung lingd
[ http://www.boutell.com/gd/ ] and ruby-gdchart is wrapper around gd
specially for graphs
(bar, pie etc.). Pretty easy to use. Just not enough docs and i

couldnt

make it
run on windows (maybe will work with cygwin, i tryed the mingw).

I suppose I should add that I need it to work on Windows...

Chris

···

<cwillia1@rochester.rr.com> wrote:

5

I haven't tried SVG::Graph, nor do I have a Windows machine on which to test it, but you do! (I would also argue that SVG _is_ a usable format, though perhaps many would disagree.)

http://www.germane-software.com/software/SVG/SVG::Graph/

- Sam

6

Sam Goldman ha scritto:

I haven't tried SVG::Graph, nor do I have a Windows machine on which to test it, but you do! (I would also argue that SVG _is_ a usable format, though perhaps many would disagree.)

SVG::Graph

works like a charm, and it generates really nice graphs with little code.