Starting with blank JPanelChart, refresh

[Nico]

Hi,
I'm a new user of JFreeChart, and I would like to know if it is possible to start my app with a blank bar chart (null dataset), and then how can I refresh this chart with a new dataset when I will push a button.
I watched a bit the sources and it seems that I can't start with "null" chart in the JFreeChartPanel constructor.
Thanks in advance,
Nico

[David Gilbert]

Hi Nico,

You can create a chart with a null dataset, but it is not possible to create a JFreeChartPanel with a null chart. I'll see if I can change the code for the next version so that you can have a null chart.

Any time you want to change the chart's dataset you should be able to call myChart.setDataset(myDataset).

Regards,

DG.

[Nico]

Hi David,
Ok, fine, thanks you.
But when I call a myChart.setDataset(myDataset), do I need to make a myJFreeChartPanel.setChart(myChart) to refresh the data ?

[David Gilbert]

In theory, no. In practice, I've never tried it. If it doesn't automatically update the panel, then it is a bug.

DG

[Nico]

I tried it, and it works, so there is no bug
Thanks,
Nico