我正在尝试创建一个烛台图表,用户可以缩放和平移,就像这样 TradingView chart .

// Domain axis
DateAxis dateAxis = new DateAxis();

// Range axis
NumberAxis priceAxis = new NumberAxis("Price");
priceAxis.setRangeType(RangeType.POSITIVE);
priceAxis.setAutoRange(true);
priceAxis.setAutoRangeIncludesZero(false);

// Plot
CandlestickRenderer renderer = new CandlestickRenderer();
XYPlot plot = new XYPlot(mPriceDataSet, dateAxis, priceAxis, renderer);
plot.setDomainPannable(true);
plot.setRangePannable(false);

// Chart
mChart = new JFreeChart("Price History", plot);

哪一个 mPriceDataSet 是我的数据集,类型为 DefaultOHLCDataset .下面是我如何创建 ChartPanel :

ChartPanel chartPanel = new ChartPanel(mChart);
chartPanel.setMouseZoomable(true);
chartPanel.setRangeZoomable(false);
chartPanel.setMouseWheelEnabled(true);

行为: 绘制图表时,一切正常,但是当用户缩放和/或平移视图端口时,范围轴不会缩放并显示第一个范围。

期望的行为: 在缩放/平移范围时,轴应动态设置其范围。一模一样 TrandingView charts .

麦克维

我根据你的 Sample8 .要重现问题,只需运行应用程序,并在12:5使用鼠标拖动选择蜡烛。如您所见,缩放/选择后的图表将不会自动调整范围,用户必须使用关联菜单手动调整范围。

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.*;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.xy.CandlestickRenderer;
import org.jfree.data.time.Minute;
import org.jfree.data.time.ohlc.OHLCSeries;
import org.jfree.data.time.ohlc.OHLCSeriesCollection;

import javax.swing.*;
import java.awt.*;
import java.text.SimpleDateFormat;

public class AutoRangeTestApp {

    private final ChartPanel chartPanel;
    private final OHLCSeriesCollection seriesCollection = new OHLCSeriesCollection();

    public AutoRangeTestApp() {
        JFreeChart chart = ChartFactory.createCandlestickChart(
                "Sample8", "Time", "Price", seriesCollection, true);
        chart.getXYPlot().setOrientation(PlotOrientation.VERTICAL);
        chart.getXYPlot().setDomainPannable(true);
        CandlestickRenderer r = (CandlestickRenderer) chart.getXYPlot().getRenderer();
        r.setAutoWidthMethod(CandlestickRenderer.WIDTHMETHOD_SMALLEST);

        // Y-axis
        NumberAxis numberAxis = (NumberAxis) chart.getXYPlot().getRangeAxis();
        numberAxis.setAutoRangeIncludesZero(false);
        numberAxis.setAutoRangeStickyZero(false);

        // X-axis
        DateAxis dateAxis = (DateAxis) chart.getXYPlot().getDomainAxis();
        dateAxis.setDateFormatOverride(new SimpleDateFormat("HH:mm"));
        dateAxis.setTickUnit(new DateTickUnit(DateTickUnitType.MINUTE, 1));
        dateAxis.setTickMarkPosition(DateTickMarkPosition.MIDDLE);

        // chartPanel
        chartPanel = new ChartPanel(chart) {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(800, 400);
            }
        };
        chartPanel.setMouseWheelEnabled(true);
        chartPanel.setMouseZoomable(true);
        chartPanel.setRangeZoomable(false);

        // series
        addSeries1();
    }

    private void addSeries1() {
        OHLCSeries series = new OHLCSeries("One");
        series.add(new Minute(0, 12, 1, 1, 2014), 97.23D, 98.47D, 97.15D, 97.43);
        series.add(new Minute(1, 12, 1, 1, 2014), 96.47D, 98.81D, 96.27D, 97.49);
        series.add(new Minute(2, 12, 1, 1, 2014), 95.88D, 96.87D, 96.11D, 96.75);
        series.add(new Minute(3, 12, 1, 1, 2014), 96.05D, 96.94D, 95.89D, 96.59);
        series.add(new Minute(4, 12, 1, 1, 2014), 95.92D, 97.00D, 95.69D, 96.92);
        series.add(new Minute(5, 12, 1, 1, 2014), 96.34D, 96.71D, 95.68D, 96.70);
        series.add(new Minute(6, 12, 1, 1, 2014), 96.65D, 96.87D, 94.91D, 96.38);
        series.add(new Minute(7, 12, 1, 1, 2014), 97.75D, 98.20D, 96.90D, 97.24);
        series.add(new Minute(8, 12, 1, 1, 2014), 97.72D, 98.47D, 97.35D, 97.64);
        series.add(new Minute(9, 12, 1, 1, 2014), 98.30D, 98.77D, 97.56D, 97.99);
        seriesCollection.addSeries(series);
    }

    public ChartPanel getChartPanel() {
        return chartPanel;
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {
                AutoRangeTestApp app = new AutoRangeTestApp();
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(app.getChartPanel());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }
}