Werte erhalten, nachdem die Punkte mit JFreeChart nach oben und unten gezogen wurden

Question

Der folgende Code zeichnet die Punkte auf, die nach oben gezogen werden können. Aber jetzt möchte ich die aktualisierten Werte der Y-Achse (Velocity) von jedem Punkt nach ziehen und erhalten Zeichnen Sie erneut mit diesen aktualisierten Werten. Anfangs ist Velocity auf der Y-Achse auf 4 eingestellt, aber nach dem Ziehen möchte ich auch die aktualisierten Velocity-Werte erhalten.

import java.awt.*; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseMotionListener; 
import java.awt.geom.Point2D; 
import java.awt.geom.Rectangle2D; 
import org.jfree.chart.*; 
import org.jfree.chart.axis.ValueAxis; 
import org.jfree.chart.entity.ChartEntity; 
import org.jfree.chart.entity.EntityCollection; 
import org.jfree.chart.entity.XYItemEntity; 
import org.jfree.chart.labels.StandardXYSeriesLabelGenerator; 
import org.jfree.chart.plot.PlotOrientation; 
import org.jfree.chart.plot.XYPlot; 
import org.jfree.chart.renderer.xy.XYItemRenderer; 
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer; 
import org.jfree.data.xy.XYDataset; 
import org.jfree.data.xy.XYSeries; 
import org.jfree.data.xy.XYSeriesCollection; 
import org.jfree.ui.ApplicationFrame; 
import org.jfree.ui.RefineryUtilities; 

    /** 
* @see http://stackoverflow.com/a/38711095/230513 
* @see http://www.jfree.org/forum/viewtopic.php?f=3&t=30569 
    */ 
public class SeriesAndPointDragAndMove extends ApplicationFrame 
implements ChartMouseListener, MouseListener, MouseMotionListener { 

public static void main(String[] args) { 
    EventQueue.invokeLater(new Runnable() { 
     @Override 
     public void run() { 
      SeriesAndPointDragAndMove app = new   SeriesAndPointDragAndMove("Plot"); 
      app.pack(); 
      RefineryUtilities.centerFrameOnScreen(app); 
      app.setVisible(true); 
     } 
    }); 
} 

private boolean canMove = false; 
private double finalMovePointY = 0; 
private ChartRenderingInfo info = null; 
private double initialMovePointY = 0; 
private JFreeChart jFreeChart = null; 
private ChartPanel chartPanel = null; 
private XYSeries series = new XYSeries("Series"); 
private XYSeriesCollection collection = new XYSeriesCollection(); 
private XYItemEntity xyItemEntity = null; 

public SeriesAndPointDragAndMove(String paramString) { 
    super(paramString); 
    jFreeChart = ChartFactory.createXYLineChart(
     "Drag Point", "Points (Index)", "Velocity (m/s)", 
     createDataset(), PlotOrientation.VERTICAL, true, true, false); 
    chartPanel = new ChartPanel(jFreeChart) { 
     @Override 
     public Dimension getPreferredSize() { 
      return new Dimension(640, 480); 
     } 
    }; 
    chartPanel.addChartMouseListener(this); 
    chartPanel.addMouseMotionListener(this); 
    chartPanel.addMouseListener(this); 
    chartPanel.setAutoscrolls(false); 
    chartPanel.setMouseZoomable(false); 
    this.info = chartPanel.getChartRenderingInfo(); 
    XYPlot localXYPlot = (XYPlot) jFreeChart.getPlot(); 
    XYItemRenderer localXYItemRenderer = localXYPlot.getRenderer(); 
    localXYItemRenderer.setSeriesStroke(0, new BasicStroke(2.0F)); 
    XYLineAndShapeRenderer localXYLineAndShapeRenderer 
     = (XYLineAndShapeRenderer) localXYPlot.getRenderer(); 
    localXYLineAndShapeRenderer.setBaseShapesVisible(true); 
    localXYLineAndShapeRenderer.setSeriesFillPaint(0, Color.white); 
    localXYLineAndShapeRenderer.setUseFillPaint(true); 
    localXYLineAndShapeRenderer.setLegendItemToolTipGenerator(
     new StandardXYSeriesLabelGenerator("Tooltip {0}")); 
    ValueAxis range = localXYPlot.getRangeAxis(); 
    range.setLowerBound(0); 
    range.setUpperBound(20); 
    setContentPane(chartPanel); 
} 

@Override 
public void chartMouseClicked(ChartMouseEvent paramChartMouseEvent) { 
} 

@Override 
public void chartMouseMoved(ChartMouseEvent paramChartMouseEvent) { 
} 

public XYDataset createDataset() { 
    for (int i = 0; i < 8; i++) { 
     series.add(i, 4); 
    } 
    collection.addSeries(series); 
    return collection; 
} 

@Override 
public void mouseClicked(MouseEvent e) { 
} 

@Override 
public void mouseDragged(MouseEvent e) { 
    movePoint(e); 
} 

@Override 
public void mouseEntered(MouseEvent e) { 
} 

@Override 
public void mouseExited(MouseEvent e) { 
    canMove = false; // stop movement if cursor is out from the chart area 
    initialMovePointY = 0; 
    chartPanel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); 
} 

public void mouseMoved(MouseEvent e) { 
} 

public void mousePressed(MouseEvent e) { 
    int x = e.getX(); // initialized point whenenver mouse is pressed 
    int y = e.getY(); 
    EntityCollection entities = this.info.getEntityCollection(); 
    ChartMouseEvent cme = new ChartMouseEvent(jFreeChart, e, entities 
     .getEntity(x, y)); 
    ChartEntity entity = cme.getEntity(); 
    if ((entity != null) && (entity instanceof XYItemEntity)) { 
     xyItemEntity = (XYItemEntity) entity; 
    } else if (!(entity instanceof XYItemEntity)) { 
     xyItemEntity = null; 
     return; 
    } 
    if (xyItemEntity == null) { 
     return; // return if not pressed on any series point 
    } 
    Point pt = e.getPoint(); 
    XYPlot xy = jFreeChart.getXYPlot(); 
    Rectangle2D dataArea = chartPanel.getChartRenderingInfo() 
     .getPlotInfo().getDataArea(); 
    Point2D p = chartPanel.translateScreenToJava2D(pt); 
    initialMovePointY = xy.getRangeAxis().java2DToValue(p.getY(), dataArea, 
     xy.getRangeAxisEdge()); 
    canMove = true; 
    chartPanel.setCursor(new Cursor(Cursor.HAND_CURSOR)); 
} 

@Override 
public void mouseReleased(MouseEvent e) { 
    // stop dragging on mouse released 
    canMove = false; 
    initialMovePointY = 0; 
    chartPanel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); 
} 

public void movePoint(MouseEvent me) { 
    if (canMove) { 
     int itemIndex = xyItemEntity.getItem(); 
     Point pt = me.getPoint(); 
     XYPlot xy = jFreeChart.getXYPlot(); 
     Rectangle2D dataArea = chartPanel.getChartRenderingInfo() 
      .getPlotInfo().getDataArea(); 
     Point2D p = chartPanel.translateScreenToJava2D(pt); 
     finalMovePointY = xy.getRangeAxis().java2DToValue(p.getY(), 
      dataArea, xy.getRangeAxisEdge()); 
     double difference = finalMovePointY - initialMovePointY; 
     if (series.getY(itemIndex).doubleValue() 
      + difference > xy.getRangeAxis().getRange().getLength() 
      || series.getY(itemIndex).doubleValue() 
      + difference < 0.0D) { 
      initialMovePointY = finalMovePointY; 
     } 
     // retrict movement for upper and lower limit (upper limit 
     // should be as per application needs) 
     double targetPoint = series.getY(itemIndex).doubleValue() + difference; 
     if (targetPoint > 15 || targetPoint < 0) { 
      return; 
     } else { 
      series.update(Integer.valueOf(itemIndex), Double.valueOf(targetPoint)); 
     } 
     jFreeChart.fireChartChanged(); 
     chartPanel.updateUI(); 
     initialMovePointY = finalMovePointY; 
    } 
} 

public void moveSeries(MouseEvent me) { 
    if (canMove) { 
     Point pt = me.getPoint(); 
     XYPlot xy = jFreeChart.getXYPlot(); 
     Rectangle2D dataArea = chartPanel.getChartRenderingInfo() 
      .getPlotInfo().getDataArea(); 
     Point2D p = chartPanel.translateScreenToJava2D(pt); 
     finalMovePointY = xy.getRangeAxis().java2DToValue(p.getY(), 
      dataArea, xy.getRangeAxisEdge()); 
     double difference = finalMovePointY - initialMovePointY; 

     for (int i = 0; i < series.getItemCount(); i++) { 
      System.out.println(series.getItemCount()); 
      if (series.getY(i).doubleValue() + difference > xy.getRangeAxis().getRange().getLength() 
       || series.getY(i).doubleValue() 
       + difference < 0.0D) { 
       initialMovePointY = finalMovePointY; 
      } 
     } 

     // retrict movement for upper and lower limit (upper limit 
     // should be as per application needs) 
     for (int i = 0; i < series.getItemCount(); i++) { 
      double targetPoint = series.getY(i) 
       .doubleValue() 
       + difference; 
      if (targetPoint > 50 || targetPoint < 0) { 
       return; 
      } 
     } 
     for (int i = 0; i < series.getItemCount(); i++) { 
      double targetPoint = series.getY(i) 
       .doubleValue() 
       + difference; 
      series.update(Integer.valueOf(i), Double.valueOf(targetPoint)); 
     } 
     jFreeChart.fireChartChanged(); 
     chartPanel.updateUI(); 
     initialMovePointY = finalMovePointY; 
    } 
} 

}

Answer 1

erhalten Benachrichtigungen über Änderungen an der XYSeries, fügen Sie ein SeriesChangeListener, wie unten dargestellt:

public SeriesAndPointDragAndMove(String paramString) { 
    … 
    series.addChangeListener(new SeriesChangeListener() { 
     @Override 
     public void seriesChanged(SeriesChangeEvent e) { 
      XYSeries series = (XYSeries) e.getSource(); 
      System.out.println(series.getItems()); 
     } 
    }); 
} 

Ausgang als der Punkt mit Abszisse 3.0 bewegt sich von Geschwindigkeit 4.0 bis 5.0:

[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.053908355795149], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.107816711590297], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.161725067385444], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.215633423180593], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.323450134770890], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.431266846361186], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.485175202156334], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.539083557951483], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.592991913746631], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.646900269541780], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.700808625336927], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.754716981132076], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.862533692722372], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.916442048517521], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.9703504043126685], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.9703504043126685], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]] 
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 5.0242587601078160], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]