java - 如何正确地将 MouseHandler 添加到我的 JFreeChart-FX 以从左向右拖动图表

Question

我设法使用 JFreeChart-FX 创建了一个烛台图表，并使用 fxgraphics2d API 显示它。但我对如何启用与我的图表的任何交互感到非常困惑，需要一些帮助。

如果在正确的方向上提供任何帮助，我将不胜感激。

我从 this 开始例如，建立我的初始图表并对其进行更改，以便它使用我的数据。然后我使用自定义 Canvas，它利用 fxgraphics2d 使 JPanel 组件可作为我的 JavaFX 的节点访问应用程序。所以我知道有一个特定的 PanHandlerFX class ，但我无法利用它。据我的研究(例如 here)，我需要将 PanHandlerFX 类添加到我的 ChartCanvas 的 availableMouseHandlers 列表中。但是我的 canvas 不提供任何类似 availableMouseHandlers 的东西。我现在感到迷茫，因为关于 JFree-FX 图表的教程和信息很少，而且文档也对我没有帮助。

这是我的自定义 Canvas 类:

import javafx.scene.canvas.Canvas;
import org.jfree.chart.JFreeChart;
import org.jfree.fx.FXGraphics2D;

import java.awt.geom.Rectangle2D;

public class ChartCanvas extends Canvas {

    JFreeChart chart;
    private FXGraphics2D graphics2D;

    public ChartCanvas(JFreeChart chart) {
        this.chart = chart;
        this.graphics2D = new FXGraphics2D(getGraphicsContext2D());
        // Redraw canvas when size changes.
        widthProperty().addListener(e -> draw());
        heightProperty().addListener(e -> draw());

    }

    private void draw() {
        double width = getWidth();
        double height = getHeight();
        getGraphicsContext2D().clearRect(0, 0, width, height);
        this.chart.draw(this.graphics2D, new Rectangle2D.Double(0, 0, width, height));
        //(this.graphics2D,, new Rectangle2D.Double(0, 0, width, height));
    }
}

这是我的自定义 JFreeChart:

import javafx.collections.ObservableList;
import org.ezstrats.model.chartData.Candlestick;
import org.ezstrats.model.chartData.Exchange;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.HighLowItemLabelGenerator;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.CombinedDomainXYPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.CandlestickRenderer;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.time.FixedMillisecond;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.ohlc.OHLCSeries;
import org.jfree.data.time.ohlc.OHLCSeriesCollection;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;

public class JFreeCandlestickChart extends JPanel {

    private static final DateFormat READABLE_TIME_FORMAT = new SimpleDateFormat("kk:mm:ss");

    private OHLCSeries ohlcSeries;
    private TimeSeries volumeSeries;
    private JFreeChart candlestickChart;

    public JFreeCandlestickChart(String title) {
        ObservableList<Candlestick> candlesticks = Exchange.getCandlesticks();
        // Create new chart
        candlestickChart = createChart(title, candlesticks);
        // Create new chart panel
        final ChartPanel chartPanel = new ChartPanel(candlestickChart);
        chartPanel.setPreferredSize(new Dimension(832, 468));
        chartPanel.getChart().getXYPlot().getDomainAxis().setAutoRange(false);
        chartPanel.getChart().getXYPlot().getDomainAxis().setLowerBound(candlesticks.get(candlesticks.size() - 300).getTimestampOpen());
        chartPanel.getChart().getXYPlot().getDomainAxis().setUpperBound(candlesticks.get(candlesticks.size() - 1).getTimestampOpen());
        // Enable zooming - not workign?! ...
        chartPanel.setMouseZoomable(true);
        chartPanel.setMouseWheelEnabled(true);
        chartPanel.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                // process before
                super.mouseDragged(e);
                chartPanel.getChart().getXYPlot().getDomainAxis().configure();
                // process after
            }
        });


        add(chartPanel, BorderLayout.CENTER);
    }

    public JFreeChart createChart(String title, ObservableList<Candlestick> candlesticks){

        /**
         * 1st:
         * Creating candlestick subplot
         */
        // Create OHLCSeriesCollection as a price dataset for candlestick chart
        OHLCSeriesCollection candlestickDataset = new OHLCSeriesCollection();
        ohlcSeries = new OHLCSeries("Price");
        candlestickDataset.addSeries(ohlcSeries);

        // Create candlestick chart priceAxis
        NumberAxis priceAxis = new NumberAxis("Price");
        priceAxis.setAutoRangeIncludesZero(false);

        // Create candlestick chart renderer
        CandlestickRenderer candlestickRenderer = new CandlestickRenderer(CandlestickRenderer.WIDTHMETHOD_AVERAGE,
                false,
                new HighLowItemLabelGenerator(new SimpleDateFormat("kk:mm"), new DecimalFormat("0.00000000")));

        // Create candlestickSubplot
        XYPlot candlestickSubplot = new XYPlot(candlestickDataset, null, priceAxis, candlestickRenderer);
        candlestickSubplot.setBackgroundPaint(Color.white);


        /**
         * 2nd:
         * Creating volume subplot
         */
        // creates TimeSeriesCollection as a volume dataset for volume chart
        TimeSeriesCollection volumeDataset = new TimeSeriesCollection();
        volumeSeries = new TimeSeries("Volume");
        volumeDataset.addSeries(volumeSeries);

        // Create volume chart volumeAxis
        NumberAxis volumeAxis = new NumberAxis("Volume");
        volumeAxis.setAutoRangeIncludesZero(true);

        // Set to no decimal
        volumeAxis.setNumberFormatOverride(new DecimalFormat("0"));

        // Create volume chart renderer
        XYBarRenderer timeRenderer = new XYBarRenderer();
        timeRenderer.setShadowVisible(false);
        timeRenderer.setDefaultToolTipGenerator(new StandardXYToolTipGenerator("Volume--> Time={1} Size={2}",
                new SimpleDateFormat("kk:mm"), new DecimalFormat("0")));

        // Create volumeSubplot
        XYPlot volumeSubplot = new XYPlot(volumeDataset, null, volumeAxis, timeRenderer);
        volumeSubplot.setBackgroundPaint(Color.white);


        /**
         * 3rd:
         * Adding Candles to this chart
         **/
         for (Candlestick candle: candlesticks){
            addCandleToChart(candle.getTimestampOpen(),
                    candle.getPriceOpen(),
                    candle.getPriceHigh(),
                    candle.getPriceLow(),
                    candle.getPriceClose(),
                    candle.getVolumeQuote());
        }


        /**
         * 4th:
         * Create chart main plot with two subplots (candlestickSubplot,
         * volumeSubplot) and one common dateAxis
         */
        // Creating charts common dateAxis
        DateAxis dateAxis = new DateAxis("Time");
        dateAxis.setDateFormatOverride(new SimpleDateFormat("dd.mm.yy kk:mm"));
        //dateAxis.setRange();
        // reduce the default left/right margin from 0.05 to 0.02
        dateAxis.setLowerMargin(0.02);
        dateAxis.setUpperMargin(0.02);
        dateAxis.setLabelAngle(0);

        // Create mainPlot
        CombinedDomainXYPlot mainPlot = new CombinedDomainXYPlot(dateAxis);
        mainPlot.setGap(10.0);
        mainPlot.add(candlestickSubplot, 4);
        mainPlot.add(volumeSubplot, 1);
        mainPlot.setOrientation(PlotOrientation.VERTICAL);
        mainPlot.setDomainPannable(true);

        JFreeChart chart = new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT, mainPlot, false);
        //chart.removeLegend();

        // Einbetten in JScrollPaenl??? um Scrollen zu ermöglichen...
//        ChartPanel chartPanel = new ChartPanel(chart);


        return chart;
    }


    /**
     * Fill series with data.
     *
     * @param c opentime
     * @param o openprice
     * @param h highprice
     * @param l lowprice
     * @param c closeprice
     * @param v volume
     */
    private void addCandleToChart(long time, double o, double h, double l, double c, double v) {
        // Add bar to the data. Let's repeat the same bar
        FixedMillisecond t = new FixedMillisecond(time);
        //READABLE_TIME_FORMAT.parse(String.valueOf(time)));
        ohlcSeries.add(t, o, h, l, c);
        volumeSeries.add(t, v);
    }


    public void setOhlcSeries(OHLCSeries ohlcSeries) {
        this.ohlcSeries = ohlcSeries;
    }
    public void setVolumeSeries(TimeSeries volumeSeries) {
        this.volumeSeries = volumeSeries;
    }
    public OHLCSeries getOhlcSeries() {
        return ohlcSeries;
    }
    public TimeSeries getVolumeSeries() {
        return volumeSeries;
    }
    public JFreeChart getCandlestickChart() {
        return candlestickChart;
    }
}

这就是我打印图表 (main.class) 的方式:

    // Switching Views
    public void drawNewChart(JFreeChart newChart){
        centerChart.getChildren().removeAll();

        ChartCanvas chartCanvas = new ChartCanvas(newChart);

        centerChart.getChildren().add(chartCanvas);
        chartCanvas.widthProperty().bind(centerChart.widthProperty());
        chartCanvas.heightProperty().bind(centerChart.heightProperty());

    }

Answer 1

如图here , 构造一个 ChartViewer使用您的 JFreeChart 创建交互式图表。查看器的封闭ChartCanvas将为您管理 PanHandlerFX。作为具体示例，将以下行添加到 example , 并按照描述拖动 here :

plot.setDomainPannable(true);

原文:

向右拖动后:

顺便说一句，您可能会发现 JavaFX Demos在这方面很有帮助。