可滚动的JFree域轴和自定义标记标签

Question

I have this code to draw graph, this works fine. I need two things here

1. on domain axis (x) I want to be able to scroll.
2. On markers I see a thick bold line. I want to be able to see some readable text for this marker.

For now I see this output

and upon zooming I see this

3. Also on domain axis I have millis values. can I map it to human readable dates ?

    public class Grapher extends ApplicationFrame { public Grapher(final String title, List<PriceModel> priceModels) { super(title); final XYSeries series = new XYSeries("foo"); double max = Double.MIN_VALUE, min = Double.MAX_VALUE; for (int i = 0; i < priceModels.size(); i++) { double price = priceModels.get(i).getPrice(); if (price < min) { min = price; } if (price > max) { max = price; } series.add((double) priceModels.get(i).getDate(), price); } final XYSeriesCollection data = new XYSeriesCollection(series); final JFreeChart chart = ChartFactory.createXYLineChart( "XY Series Demo", "X", "Y", data, PlotOrientation.VERTICAL, true, true, false ); for (int i = 0; i < priceModels.size(); i++) { if (priceModels.get(i).getAction() != null) { Marker marker = new ValueMarker((double) priceModels.get(i).getDate()); marker.setLabelAnchor(RectangleAnchor.BOTTOM_RIGHT); marker.setLabelTextAnchor(TextAnchor.TOP_RIGHT); if (priceModels.get(i).getAction() == Types.Action.SELL) { marker.setPaint(Color.green); marker.setLabel("SELL"); } else { marker.setPaint(Color.red); marker.setLabel("BUY"); } marker.setStroke(new BasicStroke(10.0f)); chart.getXYPlot().addDomainMarker(marker); } } chart.getXYPlot().setBackgroundPaint(Color.white); chart.getXYPlot().getRenderer().setPaint(Color.BLUE); chart.getXYPlot().getRangeAxis().setRange(min - 1, max + 1); final ChartPanel chartPanel = new ChartPanel(chart); chartPanel.setBackground(Color.WHITE); chartPanel.setRangeZoomable(true); chartPanel.setPreferredSize(new java.awt.Dimension(500, 270)); setContentPane(chartPanel); } public static void draw(List<PriceModel> priceModels) { final Grapher demo = new Grapher("foo", priceModels); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } } 

Answer 1

You'll have to combine several approaches:

1. Domain scrolling alternatives :

   • Try a SlidingXYDataset , implemented here and illustrated here .
   • Enable panning, eg plot.setDomainPannable(true) , as suggested here .
   • Look at paging .
   • Use a JScrollPane , eg add(new JScrollPane(chartPanel); .

2. Marker text : Use XYTextAnnotation , for example .

3. Format dates : Replace the factory's axis with a DateAxis and use setDateFormatOverride() , for example .