Concatenate values in the Jfreechart chart

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How to concatenate values in jfreechart?

I’m trying this way:

public static DefaultCategoryDataset dataset = new DefaultCategoryDataset();;

    public void atualizaDataset(int humano, int zumbi, int rodada){
        final String series1 = "Humano";
        final String series2 = "Zumbi";

        dataset.addValue(humano, series1, (Comparable)rodada);
        dataset.addValue(zumbi, series2, (Comparable)rodada);
    }

However I am not succeeding, he executes the first time I command, but when I send the second he adds as if they were the first values, they do not concatenate!

java jfreechart

  • You are using this example http://www.java2s.com/Code/Java/Chart/JFreeChartLineChartDemo1.htm?

  • Yes, this very one

  • You want to add the values by your main?

  • Yes add by main

1 answer

1

You can do the following, create a constructor that receives a CategoryDataset 

public LineChartDemo1(final String title, CategoryDataset dataset) {
        super(title);
        final CategoryDataset dataset = dataset;
        final JFreeChart chart = createChart(dataset);
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartPanel);
}

and in your main():

 DefaultCategoryDataset dataset = new DefaultCategoryDataset();
//adiciona valores aqui
final LineChartDemo1 demo = new LineChartDemo1("Line Chart Demo", dataset);
//resto do código

If you add after you have built the chart, you will need to rebuild(repaint) it.

  • But this method will not remake the graphics with the new values instead of just adding them to the existing ones?

  • Yes, it generates a graph. If you want to add to the existing one is different, just add in the dataset and make a repaint.

  • But that’s my question. How do I update the dataset without recreating the chart ? I updated the post with the current code. I tried to create the dataset as global and add values to it, but it hasn’t worked out very well yet.

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