JFreeChart - 監聽對系列的更改

Question

如何訂閱給定的JFreeChart對象以通知系列集的更改，即插入的新系列或添加到系列中的新數據點？

Answer 1

爲數據集：

Dataset coll = new XYSeriesCollection(); 
coll.addChangeListener(new DatasetChangeListener() { 
    @Override 
    public void datasetChanged(DatasetChangeEvent arg0) { 
     // TODO Auto-generated method stub 
    } 
}); 

或爲JFreeChart的本身：

JFreeChart chart = createChart(); 
chart.addChangeListener(new ChartChangeListener() { 
    @Override 
    public void chartChanged(ChartChangeEvent arg0) { 
     // TODO Auto-generated method stub 
    } 
}); 

而且我相信，這也適用於在之間的地塊，並在年底的系列。

編輯：只聽取添加/刪除系列：

final XYSeriesCollection coll = new XYSeriesCollection(); 
coll.addChangeListener(new DatasetChangeListener() { 
    private int numberOfSeries = -1; 

    @Override 
    public void datasetChanged(DatasetChangeEvent arg0) { 
     int numberOfSeriesNew = coll.getSeriesCount(); 
     if (numberOfSeriesNew == numberOfSeries) { 
      // no series was added/removed 
     } else if (numberOfSeriesNew < numberOfSeries) { 
      // series was removed 
      numberOfSeries = numberOfSeriesNew; 
     } else { 
      // series was added 
      numberOfSeries = numberOfSeriesNew; 
     } 
    } 
});