Re: 23 second to recreate a chart with 3000 samples with JfreeChart

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 17 Sep 2009 12:14:30 +0100

Message-ID:

<h8t5mm$s4g$1@south.jnrs.ja.net>

etantonio wrote:

Hi,
I'm creating an application that displays in charts data coming from
the com port,
for the charts I use Jfreechart , all seems to work but in my
application I've several charts,
so when I change from one to the other I recreate the serie from a
storage,
in this storage I've an arraylist of StringAndTime objects, a string
that represents the bytes coming from the serial port and a
Millisecond element tipycal of JFreeChart.
My problem is that I need lower times to switch from one chart to the
other, this is about 23 second to recreate a chart with 3000 samples,
how I can achieve this by your point of view ?

You really need to determine where within your program that time is being spent.
Unless you know that you cannot effectively optimize the program.

My guess would be that much of the time is taken in converting from the String
objects which represent the incoming data, into a form which JFreeChart can
display. Try running some tests to determine whether this is the case. Time how
long it takes to convert the String data to whatever data format JFreeChart
uses, and how long it takes to redraw the plot of this data. If the conversion
time is causing the delay then store the converted data rather than the
Strings, if it's JFreeChart which takes a long time to draw the plot then you
may be out of luck.

--
Nigel Wade