How to get [x,y] values from a JfreeChart to set the mouse position on screen?

Question

This question evolved from a previous question [ In JFreeChart how to get the [x,y] values of a certain point on the chart? ], with a hint from @trashgod, I was able to reach the effect I was looking for, here is my current code :

import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
import org.jfree.chart.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.entity.*;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.time.*;
import org.jfree.data.xy.XYDataset;
import org.jfree.chart.labels.*;
import org.jfree.chart.panel.*;
import org.jfree.chart.plot.*;

public class PriceVolume_Chart extends JPanel implements ChartMouseListener   // A demo application for price-volume chart.   
{
  ChartPanel panel;
  TimeSeries Price_series=new TimeSeries("Price");
  TimeSeries Volume_Series=new TimeSeries("Volume");
  Crosshair xCrosshair,yCrosshair;
  static Vector<String> Volume_Color_Vector=new Vector();
  Robot robot;

  public PriceVolume_Chart(String Symbol,int Index)
  {
    try
    {
      JFreeChart chart=createChart(Symbol);
      panel=new ChartPanel(chart,true,true,true,false,true);
      panel.setPreferredSize(new java.awt.Dimension(1000,500));
      panel.addChartMouseListener(this);
      CrosshairOverlay crosshairOverlay=new CrosshairOverlay();
      float[] dash={2f,0f,2f};
      BasicStroke bs=new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND,1.0f,dash,2f);

      xCrosshair=new Crosshair(Double.NaN,Color.black,bs);
      xCrosshair.setLabelBackgroundPaint(new Color(0f,0f,0f,1f));
      xCrosshair.setLabelFont(xCrosshair.getLabelFont().deriveFont(14f));
      xCrosshair.setLabelPaint(new Color(1f,1f,1f,1f));

      xCrosshair.setLabelGenerator(new CrosshairLabelGenerator()
      {
        @Override
        public String generateLabel(Crosshair crosshair)
        {
          long ms=(long)crosshair.getValue();
          TimeSeriesDataItem item=null;
          for (int i=0;i<Volume_Series.getItemCount();i++)
          {
            item=Volume_Series.getDataItem(i);
            if (ms==item.getPeriod().getFirstMillisecond()) break;
          }
          long volume=item.getValue().longValue();
          return NumberFormat.getInstance().format(volume);
        }
      });

      xCrosshair.setLabelVisible(true);
      yCrosshair=new Crosshair(Double.NaN,Color.black,bs);
      yCrosshair.setLabelBackgroundPaint(new Color(0f,0f,0f,1f));
      yCrosshair.setLabelFont(xCrosshair.getLabelFont().deriveFont(14f));
      yCrosshair.setLabelPaint(new Color(1f,1f,1f,1f));
      yCrosshair.setLabelVisible(true);
      crosshairOverlay.addDomainCrosshair(xCrosshair);
      crosshairOverlay.addRangeCrosshair(yCrosshair);
      panel.addOverlay(crosshairOverlay);
      add(panel);

      if (Index!=-1)
      {
        TimeSeriesDataItem itemX=Volume_Series.getDataItem(Index);
        xCrosshair.setValue(itemX.getPeriod().getFirstMillisecond());
        
        TimeSeriesDataItem itemY=Price_series.getDataItem(Index);
        yCrosshair.setValue(itemY.getValue().doubleValue());
/*
        robot=new Robot();
        robot.mouseMove((int)xCrosshair.getValue(),(int)yCrosshair.getValue());
        Out(" xCrosshair.getValue() = "+(int)xCrosshair.getValue()+"  yCrosshair.getValue() = "+(int)yCrosshair.getValue());
*/
      }
    }
    catch (Exception e) { e.printStackTrace(); }
  }

  private JFreeChart createChart(String Symbol)
  {
    createPriceDataset(Symbol);
    XYDataset priceData=new TimeSeriesCollection(Price_series);
    JFreeChart chart=ChartFactory.createTimeSeriesChart(Symbol,"Date",getYLabel("Price ( $ )"),priceData,true,true,true);
    XYPlot plot=chart.getXYPlot();
    plot.setBackgroundPaint(new Color(192,196,196));
    NumberAxis rangeAxis1=(NumberAxis)plot.getRangeAxis();
    rangeAxis1.setLowerMargin(0.40);                                           // Leave room for volume bars
    plot.getRenderer().setDefaultToolTipGenerator(new StandardXYToolTipGenerator(StandardXYToolTipGenerator.DEFAULT_TOOL_TIP_FORMAT,new SimpleDateFormat("yyyy-MM-d"),NumberFormat.getCurrencyInstance()));

    NumberAxis rangeAxis2=new NumberAxis("Volume");
    rangeAxis2.setUpperMargin(1.00);                                           // Leave room for price line   
    rangeAxis2.setNumberFormatOverride(NumberFormat.getNumberInstance());
    plot.setRangeAxis(1,rangeAxis2);
    plot.setDataset(1,new TimeSeriesCollection(Volume_Series));
    plot.setRangeAxis(1,rangeAxis2);
    plot.mapDatasetToRangeAxis(1,1);
    MyRender Renderer=new MyRender();
    Renderer.setShadowVisible(false);
    plot.setRenderer(1,Renderer);

    DateAxis domainAxis=(DateAxis) plot.getDomainAxis();                     // Consider adjusting the lower margin of the domain axis for symmetry.
    domainAxis.setLowerMargin(0.05);

    return chart;
  }

  private void createPriceDataset(String Symbol)
  {
    String Lines[]=new String[21],Items[],Date;
    int Year, Month, Day;
    long Volume,Last_Volume=0;
    double Price;

    Lines[0]="Date,Open,High,Low,Close,Adj Close,Volume";
    Lines[1]="2020-07-17,44.110001,44.369999,41.919998,42.509998,42.323395,849700";
    Lines[2]="2020-07-20,41.630001,41.680000,39.669998,40.119999,39.943886,1319300";
    Lines[3]="2020-07-21,40.880001,42.860001,40.860001,42.270000,42.084450,2070300";
    Lines[4]="2020-07-22,41.919998,42.700001,41.090000,42.570000,42.383133,1317600";
    Lines[5]="2020-07-23,43.919998,46.389999,43.279999,44.759998,44.563519,1917700";
    Lines[6]="2020-07-24,46.500000,46.500000,43.950001,44.410000,44.215057,1384600";
    Lines[7]="2020-07-27,44.000000,44.240002,42.610001,43.860001,43.667469,799800";
    Lines[8]="2020-07-28,43.389999,44.590000,42.930000,43.020000,42.831158,699700";
    Lines[9]="2020-07-29,42.759998,45.590000,42.740002,45.430000,45.230579,826200";
    Lines[10]="2020-07-30,44.160000,44.639999,42.959999,44.500000,44.304661,798100";
    Lines[11]="2020-07-31,44.330002,44.419998,42.580002,44.360001,44.165276,1037800";
    Lines[12]="2020-08-03,44.560001,45.599998,43.419998,44.939999,44.742729,797000";
    Lines[13]="2020-08-04,44.900002,45.500000,43.450001,43.540001,43.348877,971100";
    Lines[14]="2020-08-05,44.860001,45.389999,43.650002,45.330002,45.131020,902000";
    Lines[15]="2020-08-06,45.049999,46.279999,44.330002,45.299999,45.101147,645200";
    Lines[16]="2020-08-07,44.849998,46.189999,44.189999,46.150002,45.947418,604900";
    Lines[17]="2020-08-10,46.669998,48.410000,46.549999,47.290001,47.082417,960200";
    Lines[18]="2020-08-11,49.110001,50.849998,48.799999,48.910000,48.695301,1187700";
    Lines[19]="2020-08-12,49.759998,50.009998,47.060001,47.840000,47.630001,752800";
    Lines[20]="2020-08-13,46.950001,48.369999,46.459999,47.110001,47.110001,535700";

    for (int i=1;i<Lines.length;i++)
    {
      Items=Lines[i].split(",");
      Date=Items[0].replace("-0","-");
      Price=Double.parseDouble(Items[5]);
      Volume=Long.parseLong(Items[6]);
      Items=Date.split("-");
      Year=Integer.parseInt(Items[0]);
      Month=Integer.parseInt(Items[1]);
      Day=Integer.parseInt(Items[2]);
      Price_series.add(new Day(Day,Month,Year),Price);
      Volume_Series.add(new Day(Day,Month,Year),Volume);
      Volume_Color_Vector.add(Volume>=Last_Volume?"+":"-");
      Last_Volume=Volume;
    }
  }

  @Override
  public void chartMouseClicked(ChartMouseEvent event)
  {
    // ignore
  }

  public void chartMouseMoved(ChartMouseEvent cmevent)
  {
    ChartEntity chartentity=cmevent.getEntity();
    if (chartentity instanceof XYItemEntity)
    {
      XYItemEntity e=(XYItemEntity)chartentity;
      XYDataset d=e.getDataset();
      int s=e.getSeriesIndex();
      int i=e.getItem();
      double x=d.getXValue(s,i);
      double y=d.getYValue(s,i);
      Out("x = "+x+"  y = "+y);
      xCrosshair.setValue(x);
      yCrosshair.setValue(y);
    }
  }

  String getYLabel(String Text)
  {
    String Result="";

    for (int i=0;i<Text.length();i++) Result+=Text.charAt(i)+(i<Text.length()-1?"\u2009":"");
//    Out(Result);
    return Result;
  }

  private static void out(String message) { System.out.print(message); }

  private static void Out(String message) { System.out.println(message); }

  // Create the GUI and show it. For thread safety, this method should be invoked from the event-dispatching thread.
  static void Create_And_Show_GUI()
  {
    final PriceVolume_Chart demo=new PriceVolume_Chart("ADS",9);

    JFrame frame=new JFrame("PriceVolume_Chart Frame");
    frame.add(demo);
    frame.addWindowListener(new WindowAdapter()
    {
      public void windowActivated(WindowEvent e) { }
      public void windowClosed(WindowEvent e) { }
      public void windowClosing(WindowEvent e) { System.exit(0); }
      public void windowDeactivated(WindowEvent e) { }
      public void windowDeiconified(WindowEvent e) { demo.repaint(); }
      public void windowGainedFocus(WindowEvent e) { demo.repaint(); }
      public void windowIconified(WindowEvent e) { }
      public void windowLostFocus(WindowEvent e) { }
      public void windowOpening(WindowEvent e) { demo.repaint(); }
      public void windowOpened(WindowEvent e) { }
      public void windowResized(WindowEvent e) { demo.repaint(); }
      public void windowStateChanged(WindowEvent e) { demo.repaint(); }
    });
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  public static void main(String[] args)
  {
    // Schedule a job for the event-dispatching thread : creating and showing this application's GUI.
    SwingUtilities.invokeLater(new Runnable() { public void run() { Create_And_Show_GUI(); } });
  }
}

class MyRender extends XYBarRenderer
{
  @Override
  public Paint getItemPaint(int row,int col)
  {
    this.setBarAlignmentFactor(0.5);
//    System.out.println(row+" "+col+" "+super.getItemPaint(row,col));
    return PriceVolume_Chart.Volume_Color_Vector.elementAt(col).equals("+")?super.getItemPaint(row,col):new Color(0.56f,0.2f,0.5f,1f);
  }
}

The app looks like this :

But I want it to look like the following :

In order to achieve the effect of the 2nd image [ with hint of the Price at the crossing point ], I need to simulate a mouse point action, I know how to set the mouse using a Robot, but I don't know the [x,y] values for that, so my question is : if I know the cross-hair [x,y], how to convert them to the [x,y] for the mouse so when I set the mouse to that position, the hint will show up ? I was trying to achieve that in the commented out code [ robot.mouseMove() ], but it didn't work, what's the right way to do that ?

You want to move the mouse pointer in order to trigger the tooltip? — trashgod, Oct 06 '20 at 15:26
If the tooltip can show up without using a robot to simulate mouse move would be good too.I just want the info to show up [ don't care how it shows up ], but since I don't know whether it would show up if the mouse is not pointing there, I thought about simulate a mouse move to trigger it to show up. — Frank, Oct 06 '20 at 15:56

trashgod · Answer 1 · 2020-10-08T15:45:53.520

As discussed here, it is technically possible to evoke a tooltip, but it is also awkward and ephemeral. Alternatively, consider a XYTextAnnotation, illustrated below, which offers several advantages:

You can position the Annotation in data coordinates.
You can control its graphical appearance as desired.
You can avoid any delay before it appears.
You can control when it disappears using the renderer's removeAnnotation() method.

The fragment below modifies createChart() to pass the desired index and render the annotation.

private JFreeChart createChart(String Symbol, int index) {
    …
    XYPlot plot = chart.getXYPlot();
    TimeSeriesDataItem item = Price_series.getDataItem(index);
    double time = item.getPeriod().getFirstMillisecond();
    double price = item.getValue().doubleValue();
    SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-d");
    String s = "Price: "
        + f.format(new Date((long) time)) + ", "
        + NumberFormat.getCurrencyInstance().format(price);
    XYTextAnnotation note = new XYTextAnnotation(s, time, price - 1);
    note.setFont(UIManager.getFont("ToolTip.font"));
    note.setBackgroundPaint(UIManager.getColor("ToolTip.background"));
    note.setTextAnchor(TextAnchor.CENTER_LEFT);
    note.setOutlinePaint(Color.blue);
    note.setOutlineVisible(true);
    plot.getRenderer().addAnnotation(note);
    …
    return chart;
}

I'd like it to disappear once user moves the mouse.

In your implementation of chartMouseMoved(), invoke removeAnnotation(), as suggested above; you can minimize unnecessary updates by predicating the removal on the result of getAnnotations().isEmpty().

@Override
public void chartMouseMoved(ChartMouseEvent cmevent) {
    XYLineAndShapeRenderer r =
        (XYLineAndShapeRenderer) plot.getRenderer();
    if (!r.getAnnotations().isEmpty()) {
        r.removeAnnotation(note);
    }
    …
}

Thanks, this is very helpful, but it would be on the screen forever. I'd like it to disappear once user moves the mouse, so I modified it a bit, and it would show the info at start up, then after user moves the mouse, show new info at the current mouse position. — Frank, Oct 07 '20 at 16:24

score 1 · Accepted Answer · edited Oct 08 '20 at 18:42

Alright, thanks to @trashgod, I came up with the following code.

(1) It would show info at start up, but after user moves mouse, it will disappear and show info at new mouse location:

plot.getRenderer().removeAnnotation(note);

(2) It's also smart enough to avoid left and right edge, so annotation won't be cut off at the left and right side of the chart.

note.setTextAnchor(Index<Volume_Color_Vector.size()/2
    ?TextAnchor.TOP_LEFT:TextAnchor.TOP_RIGHT);

Complete code:

import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
import org.jfree.chart.*;
import org.jfree.chart.annotations.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.entity.*;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYBarRenderer;
import org.jfree.data.time.*;
import org.jfree.data.xy.XYDataset;
import org.jfree.chart.labels.*;
import org.jfree.chart.panel.*;
import org.jfree.chart.plot.*;
import org.jfree.chart.renderer.xy.*;
import org.jfree.chart.ui.*;

public class PriceVolume_Chart extends JPanel implements ChartMouseListener   // A demo application for price-volume chart.   
{
  ChartPanel panel;
  TimeSeries Price_series=new TimeSeries("Price");
  TimeSeries Volume_Series=new TimeSeries("Volume");
  Crosshair xCrosshair,yCrosshair;
  static Vector<String> Volume_Color_Vector=new Vector();
  XYTextAnnotation note;
  XYPlot plot;
  XYLineAndShapeRenderer r;
  
  public PriceVolume_Chart(String Symbol,int Index)
  {
    try
    {
      JFreeChart chart=createChart(Symbol);
      panel=new ChartPanel(chart,true,true,true,false,true);
      panel.setPreferredSize(new java.awt.Dimension(1000,500));
      panel.addChartMouseListener(this);
      CrosshairOverlay crosshairOverlay=new CrosshairOverlay();
      float[] dash={2f,0f,2f};
      BasicStroke bs=new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND,1.0f,dash,2f);

      xCrosshair=new Crosshair(Double.NaN,Color.black,bs);
      xCrosshair.setLabelBackgroundPaint(new Color(0f,0f,0f,1f));
      xCrosshair.setLabelFont(xCrosshair.getLabelFont().deriveFont(14f));
      xCrosshair.setLabelPaint(new Color(1f,1f,1f,1f));

      xCrosshair.setLabelGenerator(new CrosshairLabelGenerator()
      {
        @Override
        public String generateLabel(Crosshair crosshair)
        {
          long ms=(long)crosshair.getValue();
          TimeSeriesDataItem item=null;
          for (int i=0;i<Volume_Series.getItemCount();i++)
          {
            item=Volume_Series.getDataItem(i);
            if (ms==item.getPeriod().getFirstMillisecond()) break;
          }
          long volume=item.getValue().longValue();
          return NumberFormat.getInstance().format(volume);
        }
      });

      xCrosshair.setLabelVisible(true);
      yCrosshair=new Crosshair(Double.NaN,Color.black,bs);
      yCrosshair.setLabelBackgroundPaint(new Color(0f,0f,0f,1f));
      yCrosshair.setLabelFont(xCrosshair.getLabelFont().deriveFont(14f));
      yCrosshair.setLabelPaint(new Color(1f,1f,1f,1f));
      yCrosshair.setLabelVisible(true);
      crosshairOverlay.addDomainCrosshair(xCrosshair);
      crosshairOverlay.addRangeCrosshair(yCrosshair);
      panel.addOverlay(crosshairOverlay);
      add(panel);

      if (Index!=-1 && Index<Volume_Series.getItemCount())
      {
        TimeSeriesDataItem itemX=Volume_Series.getDataItem(Index);
        xCrosshair.setValue(itemX.getPeriod().getFirstMillisecond());
        
        TimeSeriesDataItem itemY=Price_series.getDataItem(Index);
        yCrosshair.setValue(itemY.getValue().doubleValue());

        TimeSeriesDataItem item=Price_series.getDataItem(Index);
        double time=item.getPeriod().getFirstMillisecond();
        double price=item.getValue().doubleValue();
        SimpleDateFormat f=new SimpleDateFormat("yyyy-MM-d");
        String st=" Price : "+f.format(new Date((long)time))+" , "+NumberFormat.getCurrencyInstance().format(price)+" ";
        note=new XYTextAnnotation(st,time,price-1);
        note.setFont(UIManager.getFont("ToolTip.font"));
        note.setBackgroundPaint(UIManager.getColor("ToolTip.background"));
        note.setTextAnchor(Index<Volume_Color_Vector.size()/2?TextAnchor.TOP_LEFT:TextAnchor.TOP_RIGHT);
        note.setOutlinePaint(Color.blue);
        note.setOutlineVisible(true);
        plot.getRenderer().addAnnotation(note);
      }
    }
    catch (Exception e) { e.printStackTrace(); }
  }

  private JFreeChart createChart(String Symbol)
  {
    createPriceDataset(Symbol);
    XYDataset priceData=new TimeSeriesCollection(Price_series);
    JFreeChart chart=ChartFactory.createTimeSeriesChart(Symbol,"Date",getYLabel("Price ( $ )"),priceData,true,true,true);
    plot=chart.getXYPlot();
    plot.setBackgroundPaint(new Color(192,196,196));
    NumberAxis rangeAxis1=(NumberAxis)plot.getRangeAxis();
    rangeAxis1.setLowerMargin(0.40);                                           // Leave room for volume bars
    plot.getRenderer().setDefaultToolTipGenerator(new StandardXYToolTipGenerator(StandardXYToolTipGenerator.DEFAULT_TOOL_TIP_FORMAT,new SimpleDateFormat("yyyy-MM-d"),NumberFormat.getCurrencyInstance()));

    NumberAxis rangeAxis2=new NumberAxis("Volume");
    rangeAxis2.setUpperMargin(1.00);                                           // Leave room for price line   
    rangeAxis2.setNumberFormatOverride(NumberFormat.getNumberInstance());
    plot.setRangeAxis(1,rangeAxis2);
    plot.setDataset(1,new TimeSeriesCollection(Volume_Series));
    plot.setRangeAxis(1,rangeAxis2);
    plot.mapDatasetToRangeAxis(1,1);
    MyRender Renderer=new MyRender();
    Renderer.setShadowVisible(false);
    plot.setRenderer(1,Renderer);

    DateAxis domainAxis=(DateAxis) plot.getDomainAxis();                     // Consider adjusting the lower margin of the domain axis for symmetry.
    domainAxis.setLowerMargin(0.05);
          
    r=(XYLineAndShapeRenderer)plot.getRenderer();

    return chart;
  }

  private void createPriceDataset(String Symbol)
  {
    String Lines[]=new String[21],Items[],Date;
    int Year, Month, Day;
    long Volume,Last_Volume=0;
    double Price;

    Lines[0]="Date,Open,High,Low,Close,Adj Close,Volume";
    Lines[1]="2020-07-17,44.110001,44.369999,41.919998,42.509998,42.323395,849700";
    Lines[2]="2020-07-20,41.630001,41.680000,39.669998,40.119999,39.943886,1319300";
    Lines[3]="2020-07-21,40.880001,42.860001,40.860001,42.270000,42.084450,2070300";
    Lines[4]="2020-07-22,41.919998,42.700001,41.090000,42.570000,42.383133,1317600";
    Lines[5]="2020-07-23,43.919998,46.389999,43.279999,44.759998,44.563519,1917700";
    Lines[6]="2020-07-24,46.500000,46.500000,43.950001,44.410000,44.215057,1384600";
    Lines[7]="2020-07-27,44.000000,44.240002,42.610001,43.860001,43.667469,799800";
    Lines[8]="2020-07-28,43.389999,44.590000,42.930000,43.020000,42.831158,699700";
    Lines[9]="2020-07-29,42.759998,45.590000,42.740002,45.430000,45.230579,826200";
    Lines[10]="2020-07-30,44.160000,44.639999,42.959999,44.500000,44.304661,798100";
    Lines[11]="2020-07-31,44.330002,44.419998,42.580002,44.360001,44.165276,1037800";
    Lines[12]="2020-08-03,44.560001,45.599998,43.419998,44.939999,44.742729,797000";
    Lines[13]="2020-08-04,44.900002,45.500000,43.450001,43.540001,43.348877,971100";
    Lines[14]="2020-08-05,44.860001,45.389999,43.650002,45.330002,45.131020,902000";
    Lines[15]="2020-08-06,45.049999,46.279999,44.330002,45.299999,45.101147,645200";
    Lines[16]="2020-08-07,44.849998,46.189999,44.189999,46.150002,45.947418,604900";
    Lines[17]="2020-08-10,46.669998,48.410000,46.549999,47.290001,47.082417,960200";
    Lines[18]="2020-08-11,49.110001,50.849998,48.799999,48.910000,48.695301,1187700";
    Lines[19]="2020-08-12,49.759998,50.009998,47.060001,47.840000,47.630001,752800";
    Lines[20]="2020-08-13,46.950001,48.369999,46.459999,47.110001,47.110001,535700";

    for (int i=1;i<Lines.length;i++)
    {
      Items=Lines[i].split(",");
      Date=Items[0].replace("-0","-");
      Price=Double.parseDouble(Items[5]);
      Volume=Long.parseLong(Items[6]);
      Items=Date.split("-");
      Year=Integer.parseInt(Items[0]);
      Month=Integer.parseInt(Items[1]);
      Day=Integer.parseInt(Items[2]);
      Price_series.add(new Day(Day,Month,Year),Price);
      Volume_Series.add(new Day(Day,Month,Year),Volume);
      Volume_Color_Vector.add(Volume>=Last_Volume?"+":"-");
      Last_Volume=Volume;
    }
  }

  @Override
  public void chartMouseClicked(ChartMouseEvent event)
  {
    // ignore
  }

  public void chartMouseMoved(ChartMouseEvent cmevent)
  {
    ChartEntity chartentity=cmevent.getEntity();
    if (chartentity instanceof XYItemEntity)
    {
      if (!r.getAnnotations().isEmpty()) r.removeAnnotation(note);

      XYItemEntity e=(XYItemEntity)chartentity;
      XYDataset d=e.getDataset();
      int s=e.getSeriesIndex();
      int i=e.getItem();
      double x=d.getXValue(s,i);
      double y=d.getYValue(s,i);
      Out("x = "+x+"  y = "+y);
      xCrosshair.setValue(x);
      yCrosshair.setValue(y);
    }
  }

  String getYLabel(String Text)
  {
    String Result="";

    for (int i=0;i<Text.length();i++) Result+=Text.charAt(i)+(i<Text.length()-1?"\u2009":"");
//    Out(Result);
    return Result;
  }

  private static void out(String message) { System.out.print(message); }

  private static void Out(String message) { System.out.println(message); }

  // Create the GUI and show it. For thread safety, this method should be invoked from the event-dispatching thread.
  static void Create_And_Show_GUI()
  {
    final PriceVolume_Chart demo=new PriceVolume_Chart("ADS",9);

    JFrame frame=new JFrame("PriceVolume_Chart Frame");
    frame.add(demo);
    frame.addWindowListener(new WindowAdapter()
    {
      public void windowActivated(WindowEvent e) { }
      public void windowClosed(WindowEvent e) { }
      public void windowClosing(WindowEvent e) { System.exit(0); }
      public void windowDeactivated(WindowEvent e) { }
      public void windowDeiconified(WindowEvent e) { demo.repaint(); }
      public void windowGainedFocus(WindowEvent e) { demo.repaint(); }
      public void windowIconified(WindowEvent e) { }
      public void windowLostFocus(WindowEvent e) { }
      public void windowOpening(WindowEvent e) { demo.repaint(); }
      public void windowOpened(WindowEvent e) { }
      public void windowResized(WindowEvent e) { demo.repaint(); }
      public void windowStateChanged(WindowEvent e) { demo.repaint(); }
    });
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  public static void main(String[] args)
  {
    // Schedule a job for the event-dispatching thread : creating and showing this application's GUI.
    SwingUtilities.invokeLater(new Runnable() { public void run() { Create_And_Show_GUI(); } });
  }
}

class MyRender extends XYBarRenderer
{
  @Override
  public Paint getItemPaint(int row,int col)
  {
    this.setBarAlignmentFactor(0.5);
//    System.out.println(row+" "+col+" "+super.getItemPaint(row,col));
    return PriceVolume_Chart.Volume_Color_Vector.elementAt(col).equals("+")?super.getItemPaint(row,col):new Color(0.56f,0.2f,0.5f,1f);
  }
}

Don't know how to use it, I tried "this.getClass().getAnnotations()", didn't work. — Frank, Oct 08 '20 at 14:56

How to get [x,y] values from a JfreeChart to set the mouse position on screen?

2 Answers2

Linked

Related