Real-Time Graphing


#1

Hello all .

I’m still kind of new to Ruby and trying to graph data in real-time but
I
can’t seem to find a suitable graphing engine. I’ve sniffed around
using my
friend Google, but I didn’t find anything concrete. Has anyone out
there
done a GUI graph that updates in real-time (something simple like a line
chart)? Here’s some pseudocode to help get my point across:

graph = SomeGraphEngine.new

graph.type = “line”

xvalues = Array.new

yvalyes = Array.new

for num in ( 0 … 36 )

        xvalues << Float( num * 10.0 + 50 )

        yvalues << Float( Math.sin( num * Math.pi / 15.0 ) * 16.0 )

graph.coords( xvalues, yvalues )

graph.draw

end

-Dave


#2

On Tue, 21 Mar 2006, David I. wrote:

graph.draw

end

what os? gnuplot can easily do this…

-a


#3

Oh, sorry … forgot to mention the OS is Windows XP Pro. I went to
Sourceforge to grab Gnuplot but there weren’t any files listed other
than
the manual:

http://sourceforge.net/project/showfiles.php?group_id=54673

Do you have a link to the full code w/ examples?

-Dave


#4

sender: “David I.” date: “Tue, Mar 21, 2006 at 12:59:32AM +0900” <<<EOQ
Hello all .
Hi,

I think GraphViz is what you’re looking for :wink:
the tool: http://www.graphviz.org/
the ruby module: http://raa.ruby-lang.org/project/ruby-graphviz/

never used the ruby module yet, as I am pretty new to Ruby (< 30 days).

I have used GraphViz however, and is a really cool piece of software :slight_smile:
check out the gallery: http://www.graphviz.org/Gallery.php

Good luck,
Alex


#5

I had tried GraphViz in the past and couldn’t get it to work. I
installed
the Windows binary from GraphViz’s site then installed the Ruby module.
Running the samples output (what appears to be) byte data which I
redirect
to a file with the extension ‘png’. When I try to view the output,
nothing
renders it. Excluding that, I was hoping to find something more in-line
with http://zedgraph.org/wiki/index.php?title=Main_Page (only for Ruby
instead of C#).

-Dave