Visualize a multiple lines graph with JFreeChart in Java

public MultipleLinesChart() {   // the constructor will contain the panel of a certain size and the close operations 
    super("XY Line Chart Example with JFreechart"); // calls the super class constructor
    
    JPanel chartPanel = createChartPanel();       
    add(chartPanel, BorderLayout.CENTER);
    
    setSize(640, 480);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLocationRelativeTo(null);
}

private JPanel createChartPanel() { // this method will create the chart panel containin the graph 
    String chartTitle = "Objects Movement Chart";
    String xAxisLabel = "X";
    String yAxisLabel = "Y";
    
    XYDataset dataset = createDataset();
    
    JFreeChart chart = ChartFactory.createXYLineChart(chartTitle, 
            xAxisLabel, yAxisLabel, dataset);

    customizeChart(chart);
    
    // saves the chart as an image files
    File imageFile = new File("XYLineChart.png");
    int width = 640;
    int height = 480;
    
    try {
        ChartUtilities.saveChartAsPNG(imageFile, chart, width, height);
    } catch (IOException ex) {
        System.err.println(ex);
    }
    
    return new ChartPanel(chart);
}

private XYDataset createDataset() {    // this method creates the data as time seris 
    XYSeriesCollection dataset = new XYSeriesCollection();
    XYSeries series1 = new XYSeries("Object 1");
    XYSeries series2 = new XYSeries("Object 2");
    XYSeries series3 = new XYSeries("Object 3");
    
    series1.add(1.0, 2.0);
    series1.add(2.0, 3.0);
    series1.add(3.0, 2.5);
    series1.add(3.5, 2.8);
    series1.add(4.2, 6.0);
    
    series2.add(2.0, 1.0);
    series2.add(2.5, 2.4);
    series2.add(3.2, 1.2);
    series2.add(3.9, 2.8);
    series2.add(4.6, 3.0);
    
    series3.add(1.2, 4.0);
    series3.add(2.5, 4.4);
    series3.add(3.8, 4.2);
    series3.add(4.3, 3.8);
    series3.add(4.5, 4.0);
    
    dataset.addSeries(series1);
    dataset.addSeries(series2);
    dataset.addSeries(series3);
    
    return dataset;
}

private void customizeChart(JFreeChart chart) {   // here we make some customization
    XYPlot plot = chart.getXYPlot();
    XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();

    // sets paint color for each series
    renderer.setSeriesPaint(0, Color.RED);
    renderer.setSeriesPaint(1, Color.GREEN);
    renderer.setSeriesPaint(2, Color.YELLOW);

    // sets thickness for series (using strokes)
    renderer.setSeriesStroke(0, new BasicStroke(4.0f));
    renderer.setSeriesStroke(1, new BasicStroke(3.0f));
    renderer.setSeriesStroke(2, new BasicStroke(2.0f));
    
    // sets paint color for plot outlines
    plot.setOutlinePaint(Color.BLUE);
    plot.setOutlineStroke(new BasicStroke(2.0f));
    
    // sets renderer for lines
    plot.setRenderer(renderer);
    
    // sets plot background
    plot.setBackgroundPaint(Color.DARK_GRAY);
    
    // sets paint color for the grid lines
    plot.setRangeGridlinesVisible(true);
    plot.setRangeGridlinePaint(Color.BLACK);
    
    plot.setDomainGridlinesVisible(true);
    plot.setDomainGridlinePaint(Color.BLACK);
    
}

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            new MultipleLinesChart().setVisible(true);
        }
    });
}

}

And this is the result we have after running the code .

With JFreeChart it is pretty easy to make even more data visualizations.

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