Jfreechart - Refresh a chart according to changing data

Question

I would like to know how to refresh a chart if we want to change "in live" some piece of data. I mean for instance, I have a chart with a TaskSeries which appears on 3 years and I would like to change 3 years by 5 years. I want the chart to change immediately.

Is there some kind of update chart or something like that ?

I know that you could say "get your TaskSeries, do your changes and it will be refreshed automatically" but my TaskSeries are generated and I cannot easily change these ones. That's why I would like to find a way to recalculate and to rebuild the whole chart.

score 7 · Answer 1 · edited May 23 '17 at 10:29

7

The add() method of TaskSeries automatically sends a SeriesChangeEvent to all registered listeners, e.g. CategoryPlot. In this example, DynamicTimeSeriesCollection implements SeriesChangeEvent. In this case, the chart's XYPlot is a registered listener.

edited May 23 '17 at 10:29

Community

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answered Jun 01 '11 at 19:32

trashgod

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Is `XYPlot` registered as the listener which listens to `SeriesChangeEvent` by default when the `JFreeChart` is created by `ChartFactory` (that is to say, I don't need to register one by myself)? Your answer helped me twice in two days. Thanks! – Dante WWWW Dec 29 '11 at 08:11
Indirectly: [`AbstractSeriesDataset`](http://www.jfree.org/jfreechart/api/javadoc/org/jfree/data/general/AbstractSeriesDataset.html) _forwards_ series changes to the plot, which (automatically) listens for `Dataset` changes. – trashgod Dec 29 '11 at 09:12

score 5 · Answer 2 · answered Sep 04 '14 at 12:56

5

I had this issue too with an XYPlot. I found a workaround by resetting the dataset:

chart.getXYPlot().setDataset(chart.getXYPlot().getDataset());

that's crazy but it works...

Note: chart.setNotify(true) seems to do nothing.

answered Sep 04 '14 at 12:56

Djak

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score 4 · Answer 3 · edited Dec 27 '14 at 12:46

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I had this issue; I did it using this:

private void refreshChart() {
    jPanel_GraphicsTop.removeAll();
    jPanel_GraphicsTop.revalidate(); // This removes the old chart 
    aChart = createChart(); 
    aChart.removeLegend(); 
    ChartPanel chartPanel = new ChartPanel(aChart); 
    jPanel_GraphicsTop.setLayout(new BorderLayout()); 
    jPanel_GraphicsTop.add(chartPanel); 
    jPanel_GraphicsTop.repaint(); // This method makes the new chart appear
}

edited Dec 27 '14 at 12:46

yegor256

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answered Jul 04 '11 at 14:17

Danni V. Hansen

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you have any errors,but is a good solution 1.-refreshChart( 2.-aChart initialization – cmujica Jul 22 '14 at 18:11

score 3 · Answer 4 · answered Mar 27 '16 at 03:45

3

// create a chart
ChartFrame mychartframe = new ChartFrame("my charts", chart);

// some other stuff ...

// somewhere else in a code far far away
mychartframe.getChartPanel().getChart().fireChartChanged();

answered Mar 27 '16 at 03:45

mnmp

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score 1 · Answer 5 · answered Aug 16 '16 at 20:25

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What worked with me was the following:

//reset with new dataset
chart().setDataset(dataset);
repaint the ChartPanel that contains the JFreeChart
chartPanel.repaint();

answered Aug 16 '16 at 20:25

user3245747

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score 0 · Answer 6 · answered Jun 01 '11 at 11:55

0

I haven't found an easy way to update a JFreeChart "live", since the data-structure of jfreechart is very incompatible to my data-structure. So I build a redraw()-Method of my own, that collects the data from my dataModel, build up a JFreeChart dataModel and set the chart new.

This gives the feeling of a "live" update, also it is very ugly.

answered Jun 01 '11 at 11:55

Erik

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I've found JFreeChart's approach very compatible with Swing's [separable model architecture](http://java.sun.com/products/jfc/tsc/articles/architecture/). – trashgod Jun 01 '11 at 19:34

Jfreechart - Refresh a chart according to changing data

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