CODEWITHSUNDEEP
javagraphjfreechart
Mark Manickaraj
Mark Manickaraj

Reputation: 1671

JFreeChart Large Data Can't Read Axis

I am using JFreeChart to plot a line graph. The app reads in sensory data every 100 milliseconds so for a few minutes of capture it's a a lot of data. I don't plot the graph dynamically, it is static. I am using a Category plot since the axis can sometimes be decimal values, other times it can be strings, other times it can be boolean. My issue is the X axis (time) has so much data I can't make out the text:

enter image description here

Anyone know what I can do here to? Any tips or tricks to deal with this will be great!

 private CategoryDataset createDataset() {
    String series1 = "First";
    String series2 = "Second";
    String category1 = "Category 1";
    String category2 = "Category 2";
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    for (int i = 0; i < time.size(); i++) {
        dataset.addValue(Math.random(), series1, time.get(i));
    }
    return dataset;

}

private JFreeChart createChart(final CategoryDataset dataset) {

    // create the chart...
    final JFreeChart chart = ChartFactory.createLineChart(
            "Line Chart Demo 6", // chart title
            "Time", // x axis label
            "RPM", // y axis label
            dataset, // data
            PlotOrientation.VERTICAL,
            true, // include legend
            true, // tooltips
            false // urls
    );

    chart.setBackgroundPaint(Color.white);

    final CategoryPlot plot = chart.getCategoryPlot();
    plot.setBackgroundPaint(Color.white);
    plot.setDomainGridlinePaint(Color.white);
    plot.setRangeGridlinePaint(Color.white);

    final CategoryItemRenderer renderer = (CategoryItemRenderer) plot.getRenderer();

    plot.setRenderer(renderer);



    return chart;

}

public void setLists(ArrayList<String> time) {
    this.time = time;
    final CategoryDataset dataset = createDataset();
    final JFreeChart chart = createChart(dataset);
    final ChartPanel chartPanel = new ChartPanel(chart);
    chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
    setContentPane(chartPanel);
}

Upvotes: 1

Views: 1005

Answers (1)

GrahamA
GrahamA

Reputation: 5923

You can turn off the Lables and TickMarks by adding:

CategoryPlot plot = (CategoryPlot) chart.getPlot();
CategoryAxis cx = new CategoryAxis();
cx.setTickLabelsVisible(false);
cx.setTickMarksVisible(false);
plot.setDomainAxis(cx);

If you wantto display a subset of the labels (every nth value) then you will need to subclass CategoryAxis so you can overide CategoryAxis#drawCategoryLabels() andCategoryAxis#drawTickMarks()

Upvotes: 0

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