I need help to combine XYModel and BoxPlotModel into a single Chart

answered 2020-09-28 12:15:35 +0800

cor3000
6280 ● 2 ● 7

updated 2020-09-28 12:16:41 +0800

The different ChartModels are only useful to manage a chart with the same series. For charts with different series you have to add the Point objects directly.

The setData method has several overloaded versions. In the example below I used setData(Point... data)

    ...
    chart.setTitle("boxplot with datetime axis");
    chart.getXAxis().setType("datetime");

    Series ensembleSeries = new Series();
    ensembleSeries.setType("spline");
    ensembleSeries.setData(splineData());

    Series boxPlotSeries = new Series();
    boxPlotSeries.setType("boxplot");
    boxPlotSeries.setData(boxplotData());

    chart.addSeries(ensembleSeries);
    chart.addSeries(boxPlotSeries);
    ...

    private Point[] splineData() {
        Point[] data = new Point[5];
        data[0] = new Point(date(-8), 35);
        data[1] = new Point(date(-4), 34);
        data[2] = new Point(date(0), 30);
        data[3] = new Point(date(2), 25);
        data[4] = new Point(date(4), 15);
        return data;
    }

    private Point[] boxplotData() {
        Point[] data = new Point[6];
        data[0] = boxPlotPoint(date(-8), 12, 22, 35, 48, 56);
        data[1] = boxPlotPoint(date(-5), 12, 22, 35, 48, 56);
        data[2] = boxPlotPoint(date(-3), 12, 22, 35, 48, 56);
        data[3] = boxPlotPoint(date(-2), 12, 22, 35, 48, 56);
        data[4] = boxPlotPoint(date(-1), 13, 23, 37, 41, 43);
        data[5] = boxPlotPoint(date(0), 10, 20, 30, 40, 50);
        return data;
    }

    private Point boxPlotPoint(Number datetime, 
            Number low, Number q1, Number med, Number q3, Number high) {
        Point p = new Point();
        p.setX(datetime);
        p.setHigh(low);
        p.setQ1(q1);
        p.setMedian(med);
        p.setQ3(q3);
        p.setLow(high);
        return p;
    }

    private long date(int dayOffset) {
        return LocalDateTime.now().plusDays(dayOffset).toInstant(ZoneOffset.UTC).toEpochMilli();
    }
}

answered 2020-09-28 12:24:29 +0800

cor3000
6280 ● 2 ● 7

minor low-high-mix-up in the code above (should be):

p.setX(datetime);
p.setLow(low);
p.setQ1(q1);
p.setMedian(med);
p.setQ3(q3);
p.setHigh(high);