JFreeChart - Timeseries 和 CandleStick 在同一张图表上

Question

我正在尝试在 JFreeChart 中生成一个图表，其中包含一个重叠的烛台图和时间序列图。 （有点像）

_{（来源：prices-oil.org）}

我已尝试创建烛台图表，然后添加一个额外的 XY 系列及其渲染器，但这会导致运行时错误 org.jfree.data.xy.XYSeriesCollection cannot be cast to org.jfree.data.xy.OHLCDataset

我的一个sn-p代码如下

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;
}

任何建议都将不胜感激

Answer 1

这可以使用 JFreeChart，关键是创建一个额外的数据集和渲染器

您需要创建一个新的TimeSeriesCollection 来保存另外三个系列的数据

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);

然后像往常一样将数据添加到TimeSeries。

然后您需要将otherDataSet 添加到OhlcChart 中的Plot 中，将其映射到原始绘图的同一轴 (mapDatasetToRangeAxis) 并提供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);

这是一个使用OHLCDataset 而不是BoxAndWhiskerXYDataset 的示例