How to add a scale bar or axis to a scatter plot?

Question

I wrote some code that plots coordinates onto a drawing area (JPanel). here is my code class:

class POSCanvas extends JPanel {
    private XYSeries pnts = new XYSeries("Position");

    public POSCanvas() {
        final ChartPanel chartPanel = createDemoPanel();
        this.add(chartPanel, BorderLayout.CENTER);
    }

    private void update(double xnew, double ynew) {
        pnts.add(new XYDataItem(xnew, ynew));
    }

    private ChartPanel createDemoPanel() {
        JFreeChart jfreechart = ChartFactory.createScatterPlot(
            "", "X", "Y", createSampleData(),
            PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyPlot = (XYPlot) jfreechart.getPlot();
        XYItemRenderer renderer = xyPlot.getRenderer();
        NumberAxis domain = (NumberAxis) xyPlot.getDomainAxis();
        int minX = (int)pnts.getMinX(); int maxX = (int)pnts.getMaxX();
        if (minX < maxX){domain.setRange(minX, maxX);}
        domain.setTickUnit(new NumberTickUnit(1));
        NumberAxis range = (NumberAxis) xyPlot.getRangeAxis();
        range.setTickUnit(new NumberTickUnit(1));
        return new ChartPanel(jfreechart){
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(640, 480);
            }
        };
    }

    private XYDataset createSampleData() {
        XYSeriesCollection xySeriesCollection = new XYSeriesCollection();
        xySeriesCollection.addSeries(pnts);
        return xySeriesCollection;
    }
}

The problem is that I can not seem to add the range for the X axis. Here is the output:

I am using the domain.setRange() method but it does not work. Any idea how to fix it? Any help would be appreciated; thank you.

score 2 · Answer 1 · edited May 23 '17 at 12:07

2

Try ChartFactory.createScatterPlot(), which "uses an XYPlot instance as the plot, with a NumberAxis for the domain axis, a NumberAxis as the range axis, and an XYLineAndShapeRenderer as the renderer." Several complete examples are shown here, and the factory's source is included in the distribution.

edited May 23 '17 at 12:07

Community

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1

answered Mar 29 '16 at 08:47

trashgod

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i have switched to JFreechart. it creates the y axis but does not create the X axis. any idea why is that? – Mar 29 '16 at 10:27
1

What happens if you don't change `domain`? A [mcve] would make it easier to test. – Catalina Island Mar 29 '16 at 10:43

How to add a scale bar or axis to a scatter plot?

1 Answers1