Plot 2D graph in Java from RS-232 data

[spratana]

I need to plot ECG graph, real-time from tx-port of RS-232 hardware, so it is only receiving the data.

So I need :
1) Serial com part for Java
2) I need 2D plotting algorithm, esp. the x- and y- axis ratio and scale, and x-axis need to be time dependent.

Can anyone help me solve this problem?

I found something for the use of rxtx.dll and RXTXcomm.jar
The said this 2 files could be included in ..jre/bin and ..jre/lib/ext respectively, but I d/l the complete program that is already compiled not a source file. So I think there should be some original code or structure for this which I am not sure where I could get start with all this combination of code for Java Comm.

Please help cos I need to plot this graph via TCP/IP on web, so I need the graph to be set of applet i could include in the website-based and plotting almost real-time with some certain delay or reading from RS-232 and write to file and read back and plot afterwards.

[Java Tip]

For both of the purposes, you can use existing apis. Java has an api (first link on google search) for serial port access. But it looks like windows support of it is dropped. It was a pain to install it but i remember, at the end i had found a working tutorial on it. Sorry but i dont have its link. It was long time ago.

For plot, search "java chart library" on google, there are several libraries and you might find your chart already supported by one of them. If not you can develop your own chart by extending them.

And for your purpose, to show the chart on an applet, i recommend you to write the data to be drawn to the file. The applet can have a thread which frequently checks the file for updates and present the new chart when data is update.

Good luck.

[spratana]

Well, those recommends is a junk program I found in internet they need someone to pay for download the stuff for graph, but not what I really want for my implementation.

Right now I have trouble with compilation of the Applet..
How to add main argument to complie the applet

if

I have

my class extends JApplet {
...}

public static void main[](...)
{ //should I do
JApplet.SetLookandFeel...???

}
Thanks, I'm not an expert in this field.

but my applet and JFrame is not working and it compile perfectly from the example I had but I can't see the result.

Pratana S.

[Java Tip]

There is no main methods for applets. I recommend you to read the basics first.