Time Series Chart - Date Axis Question

[Psyala]

Hi there!

I have created a TimeSeriesChart which display 2 days worth of data at 30 minute granularity.

I would like the X-Axis to tick interval every 1 hour (which works).

However, because the data spans multiple days you can potentially see repeating times.
Would it be possible that when the time is "00:00" - also display the date ie "13-MAR 00:00".

My current code:

Code: Select all

        //Chart Settings
        jFreeChart = ChartFactory.createTimeSeriesChart("", "", "Value", dataSet, false, true, false);
        jFreeChart.setBackgroundPaint(Color.WHITe);

        //Plot Settings
        plot = jFreeChart.getXYPlot();
        plot.setOrientation(PlotOrientation.VERTICAL);
        plot.setBackgroundPaint(Color.BLUE);
        plot.setDomainGridlinePaint(Color.BLACK);
        plot.setRangeGridlinePaint(Color.BLACK);
        plot.setAxisOffset(new RectangleInsets(5, 0, 0, 5));
        renderer = new XYLineAndShapeRenderer(true, true);
        plot.setRenderer(renderer);

        //Date Axis Settings
        domainAxis = (DateAxis) plot.getDomainAxis();
        plot.setDomainAxis(domainAxis);
        domainAxis.setLowerMargin(0.01);
        domainAxis.setUpperMargin(0.01);
        domainAxis.setTickUnit(new DateTickUnit(DateTickUnitType.HOUR, 1, new SimpleDateFormat("HH:00")), true, true);
        domainAxis.setTickMarkPosition(DateTickMarkPosition.START);

Example of desired output:
https://imgur.com/a/QHnPR2z

Thanks in advance!

[John Matthews]

One alternative: add a second domain axis with a different date format.

[Psyala]

One alternative: add a second domain axis with a different date format.

Hi John, would you advise on what the best way to approach that would be?

[John Matthews]

Another alternative: add a suitable pattern to your SimpleDateFormat, perhaps D or E.

[Psyala]

I've managed to add another axis, which achievess what I desire with the following code:

Code: Select all

        //Date Axis Settings
        dateAxis = new DateAxis("");
        plot.setDomainAxis(1, dateAxis);
        plot.setDomainAxisLocation(1, AxisLocation.BOTTOM_OR_LEFT);
        plot.mapDatasetToDomainAxes(0, Arrays.asList(0, 1));
        dateAxis.setLowerMargin(0.01);
        dateAxis.setUpperMargin(0.01);
        dateAxis.setTickUnit(new DateTickUnit(DateTickUnitType.DAY, 1, new SimpleDateFormat("dd-MMM")), true, true);
        dateAxis.setTickMarkPosition(DateTickMarkPosition.START);
        dateAxis.setTickLabelFont(numberAxis.getTickLabelFont());
        dateAxis.setTickMarkStroke(new BasicStroke(1));
        dateAxis.setAxisLineVisible(false);

[prit_sachin]

Psyala: Can I have your sample code, would like to see how dataset is formed, thanks in adavance

[alarawany]

add pattern that fits

[Mikexo]

Psyala: Can I have your sample code, would like to see how dataset is formed, thanks in adavance

Agree, would be curious to see it too. Have free time at my home in Portugal this week so would be nice to look into a sample code. Please post if you can