Hi,
I'm trying to create a chart similar to the following: http://wwwisis2.isis.rl.ac.uk/DataAnalysis/jpowder/Images/XYZDataSet.png. The chart in question uses an XYZDataset, however the Jasper Reports API only refers to the Bubble chart. There is no mention of XYBlock or XYShape charts.
To date I have used chart customisers to tweak charts where required but I'm wondering if I need to use a different approach in this instance. I've attempted to create a cusomiser for a bubble chart but need to work out how to override the default rendering of bubbles. I'm not sure if this is best use of my time.
I have been reading documentation on rendering images using third party APIs and it looks like I should be able to create a chart of my choice using a scriptlet. Is a valid approach?
Cheers
2 Answers:
The answer to my question is create a report (that uses an image element) with an appropriate scriptlet class. Create a variable with class attribute set to net.sf.jasperreports.engine.JRRenderable.
I used the afterReportInit() method where I set the variable using JCommonDrawableRenderer().
The chart uses a DateAxis that ranges between the first and last days of a month. I've tested the chart building code in a separate Java program and used the code in the scriptlet. The following statement "xAxis.setRange(end.getTime(), start.getTime());" works in my Java code but fails in the scriptlet with "net.sf.jasperreports.engine.JRException: java.lang.IllegalArgumentException: Requires 'lower' < 'upper'.". The relevant scriptlet code is as follows:
public void afterReportInit() throws JRScriptletException { int year = 2016; int month = 1; int day = 1; Calendar[] dates = dateRange(year, month, day); Calendar start = dates[0]; Calendar end = dates[1]; XYZDataset dataset = createDataset(start, end); DateAxis xAxis = new DateAxis(); xAxis.setRange(start.getTime(), end.getTime()); xAxis.setLowerMargin(0.0); NumberAxis yAxis = new NumberAxis(); yAxis.setUpperMargin(0.0); yAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); XYBlockRenderer renderer = new XYBlockRenderer(); renderer.setBlockWidth(1000.0 * 60.0 * 60.0 * 24.0); renderer.setBlockHeight(0.5f); renderer.setBlockWidth(0.1f); XYPlot plot = new XYPlot(dataset, xAxis, yAxis, renderer); plot.setBackgroundPaint(Color.lightGray); plot.setRangeGridlinePaint(Color.white); plot.setAxisOffset(new RectangleInsets(5, 5, 5, 5)); JFreeChart chart = new JFreeChart(null, plot); chart.removeLegend(); chart.setBackgroundPaint(Color.white); ChartUtilities.applyCurrentTheme(chart); this.setVariableValue("Chart", new JCommonDrawableRenderer(chart)); } private static Calendar[] dateRange(int year, int month, int day) { Calendar start = new GregorianCalendar(year, month, day); start.set(Calendar.DAY_OF_MONTH, 1); start.set(Calendar.HOUR_OF_DAY, 0); start.set(Calendar.MINUTE, 0); start.set(Calendar.SECOND, 0); start.set(Calendar.MILLISECOND, 0); int numberOfDays = start.getActualMaximum(Calendar.DAY_OF_MONTH); Calendar end = (Calendar) start.clone(); end.set(Calendar.DAY_OF_MONTH, numberOfDays); end.set(Calendar.HOUR_OF_DAY, 23); end.set(Calendar.MINUTE, 59); end.set(Calendar.SECOND, 59); end.set(Calendar.MILLISECOND, 999); return new Calendar[] { start, end }; }
What possible reason could there be for this inconsistency?
On a different note, my scriplet are not picked up when I re-preview in Jasper Studio unless I restart the IDE which now entails having to exit. Can anyone tell me what happened to the restart menu option? I am running 6.2.0.final under Ubuntu 14.04.
