烛台图表上的注释不起作用

Question

我正在尝试向图表添加注释。它似乎是添加的，因为如果我再添加一个，绘图注释列表的 size() 会增加。问题是没有显示。

OHLCDataset candles = createCandleDataset();

// Create chart
chart = ChartFactory.createCandlestickChart(
    "mychart", "", "", candles, true);

XYPlot plot = (XYPlot) chart.getPlot();        

XYShapeAnnotation a1 = new XYShapeAnnotation(
    new Rectangle2D.Double(10.0, 20.0, 20.0, 30.0),
    new BasicStroke(1.0f), Color.blue);
plot.addAnnotation(a1);

ChartPanel panel = new ChartPanel(chart);
setContentPane(panel);

有什么想法吗？

Answer 1

XYShapeAnnotation API 说：

The shape coordinates are specified in data space.

您的 Rectangle2D 坐标相对于您的实际数据可能不明显。相反，使用来自 OHLCDataset to construct your annotation. Focusing on the second item in series1 in this example 的坐标，下图说明了从基础 OHLCSeries 检索数据以创建一个周期宽且跨越 high/low 值的注释。

// series
addSeries1();
OHLCSeries series = seriesCollection.getSeries(0);
OHLCItem item = (OHLCItem) series.getDataItem(1);
RegularTimePeriod t = item.getPeriod();
long x = t.getFirstMillisecond();
long w = t.getLastMillisecond() - t.getFirstMillisecond(); 
double y = item.getLowValue();
double h = item.getHighValue() - y;
XYShapeAnnotation a1 = new XYShapeAnnotation(
    new Rectangle2D.Double(x, y, w, h),
    new BasicStroke(1f), Color.blue
);
chart.getXYPlot().addAnnotation(a1);

OHLCDataset 的其他实现有相应的访问器。

烛台图表上的注释不起作用

Annotations on candlestick chart not working

java

jfreechart