drawing graph from VB

You can try to use Excel, it should be relatively easy to use from VB.
Also, I can't remember names, but there are a lot of third party components that draw graphs, a quick search in Google, should help you.

well C2, i have tried, and got one, but the problem was that i was not able to dynamically update the graph and also i was not able to make the graph to autoresize. and one more thing is that i was not able to add the scroll bars to the frame so that if the graph is larger than the window, scrollbars may be activated...do u have any idea?

Hi
You can try one of these business charting components, they're of the best out there (payware):
Software FX / Chart FX: http://eu.softwarefx.com/
Dundas / Dundas Chart: http://www.dundas.com
Nevron / Nevron Chart: http://www.nevron.com

Instead of "updating" the chart you'll probably need to redraw it (which goes quite fast with these components). If you are processing data very quickly, you might need to look into some more dynamic approaches (like gauges / instrumentation), possibly something like from http://www.globalmajic.com?

John

hello John,
     i want the controls for VB6 not for VB.net. i tried 'ocxgraph' but it lacks functionality.
Ravi

You may consider using ChartDirector from http://www.advsofteng.com/

Preece

Hi Ravi, they all offer .NET and COM-Versions, take your pick :) - how fast are you updating your data and what kind of chart are you looking for?
John

thanks preece,
   i have downloaded it and will try it out..and john regarding ur comment, my data acquisition rate would be rangign from 2 milli seconds to some 2 seconds..In any way i want to update the graph. but my data logger can handle data in its buffer until it is read out..

Bye
Ravi

you're welcome.  After reading more of this thread, you may find that ChartDirector might not dynamically update the graph...  Let us know if it does!

Hi Ravi
Unless you plan on setting up a timer object with something like a 30 second cycle, I wouldn't go with the business-graphics objects (too much overhead for each redraw). In this case I would go with one of the more "Instrumentation"-type components, they're better for pseudo-realtime updating. What type of graph are you looking for?

Try the following:
  http://www.globalmajic.com  /   http://www.hallogram.com/insactx/index.html
  http://cstsoft.com/english/iap.htm
  http://www.precisionocx.com/
  http://www.iocomp.com/
  http://www.quinn-curtis.com/

It all depends on the type of graph you are looking at + if it needs to support more than "just" that :).
Let us know if you need more or if I missed the mark completely :)
John

hello preece,
     i checked out the documentation of chart director.It cannot update the graph dynamically.

hi john,
   thanks for ur extensive search, but i think u are slightly deviated from the path. I want the charting tools not the industrial controls etc. i already have the program for logging the data in to the computer,but i want an addin so that while acquiring the data i can dynamically update the graph (i want line graph) so that i can stop the experiemnt if i find any anomaly in the graph. I think u have got the point...