JFreeChart - Timeseries and CandleStick on the same chart

Question

I am trying to create one chart in JFreeChart, which consists of an overlaid candlestick chart and a Timeseries chart. (a bit like this)

_{(source: Prices-oil.org )}

I tried to create a Candlestick chart and then add an additional XY series and visualize it, but this leads to a runtime error org.jfree.data.xy.XYSeriesCollection cannot be cast to org.jfree.data.xy.OHLCDataset

A snippet of my code is as follows

 private XYPlot plot; private XYSeriesCollection dataTrend; private XYItemRenderer renderer; public OhlcChart(BarCollection bars) { JFreeChart jfreechart = ChartFactory.createCandlestickChart("FX Trader Prototype", "Time", "Value", getDataset(bars), true); plot = (XYPlot)jfreechart.getPlot(); plot.setDomainPannable(true); NumberAxis numberAxis = (NumberAxis)plot.getRangeAxis(); numberAxis.setAutoRangeIncludesZero(false); numberAxis.setAutoRangeStickyZero(false); numberAxis.setUpperMargin(0.0D); numberAxis.setLowerMargin(0.0D); DateAxis dateAxis = (DateAxis) plot.getDomainAxis(); SimpleDateFormat formatter = new SimpleDateFormat("dd MMM HH:mm.ss"); dateAxis.setDateFormatOverride(formatter); this.renderer = plot.getRenderer(); Stroke myStroke = new BasicStroke((float) 1.0); this.renderer = new XYLineAndShapeRenderer(); this.renderer.setSeriesPaint(0, Color.blue); this.renderer.setSeriesStroke(0, myStroke); } public OhlcChart update(Timeseries<Double> ts) { Stroke myStroke = new BasicStroke((float) 1.0); XYLineAndShapeRenderer timeSeriesRenderer = new XYLineAndShapeRenderer(); timeSeriesRenderer.setBaseShapesVisible(false); timeSeriesRenderer.setSeriesPaint(0, Color.blue); timeSeriesRenderer.setSeriesStroke(0, myStroke); UiTimeseries series = new UiTimeseries(ts); dataTrend.addSeries(series); plot.setDataset(plot.getDatasetCount()+1, dataTrend); plot.setRenderer(plot.getDatasetCount()+1, timeSeriesRenderer); return this; } 

Any advice would be greatly appreciated.

Answer 1

This is possible using JFreeChart, the key is to create an additional data set and visualization tool

You will need to create a new TimeSeriesCollection to store data for three additional series

 TimeSeriesCollection otherDataSet = new TimeSeriesCollection(); TimeSeries ts1 = new TimeSeries("Series 1"); otherDataSet.addSeries(ts1); TimeSeries ts2 = new TimeSeries("Series 2"); otherDataSet.addSeries(ts2); TimeSeries ts3 = new TimeSeries("Series 2"); otherDataSet.addSeries(ts3); 

Then add data to TimeSeries as usual.

Then you need to add otherDataSet to Plot in OhlcChart , map it to the same axis in the original plot ( mapDatasetToRangeAxis ) and provide Renderer

 //Add the otherDataSet to the plot and map it to the same axis at the original plot int index = 1; plot.setDataset(index, otherDataSet); plot.mapDatasetToRangeAxis(index, 0); XYItemRenderer renderer2 = new XYLineAndShapeRenderer(); plot.setRenderer(1, renderer2); plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD); 

Here is an example of using OHLCDataset rather than BoxAndWhiskerXYDataset