Hi,
I have a know formatted file with xy points to plot a graph, the file is like this:
scalex|scaley
x1|y1
x2|y2
x3|y3
. .
. .
x300|y300
This file change continuosly, everytime is being generated other 300 points, it takes about 2 seconds, the file becomes empty and then the newest points are inserted, so I have to be reading it in cycles, continuosly and plotting the graph with these points. This file is created by a real-time application, so the graph has to be a real-time plot.
How can I do it with JFreeChart ?
I'm sorry if it's stupid but I'm new using it.
Cheers,
Mauro
XY Plot with a file as source
-
David Gilbert
Re: XY Plot with a file as source
Are you plotting a new set of 300 points every two seconds? As in completely replacing the old points. You can probably handle that with JFreeChart.
If you are adding 300 extra points every two seconds, I suspect you will run into performance problems before too long.
You need to write some code to read your text file and populate an XYSeries instance. Then you can do this:
XYSeriesCollection myDataset = new XYSeriesCollection(series);
myChart.getXYPlot().setDataset(myDataset);
...to update your chart every two seconds.
Regards,
DG.
If you are adding 300 extra points every two seconds, I suspect you will run into performance problems before too long.
You need to write some code to read your text file and populate an XYSeries instance. Then you can do this:
XYSeriesCollection myDataset = new XYSeriesCollection(series);
myChart.getXYPlot().setDataset(myDataset);
...to update your chart every two seconds.
Regards,
DG.
-
Mauro
Re: XY Plot with a file as source
Hi David,
As you said first I'm plotting a new set of 300 points every two seconds replacing the oldest points, always 300 points will be in the file.
Cheers,
Mauro
As you said first I'm plotting a new set of 300 points every two seconds replacing the oldest points, always 300 points will be in the file.
Cheers,
Mauro