charts - JavaFX 2.x: 折れ線グラフと線の変換

Question

XYLineChart と線をプロットするこのクラスがあります。マウスを左クリックしてドラッグすると、チャートが左右に移動します。

グラフを左右にすばやく移動 (振る) すると、以前は XYLineChart に関連していたときに、プロットされた線がなくなることがあります。

グラフをどれだけ速く振っても、プロットされた線は常にグラフに関連する同じ場所に表示されます。

これを修正する方法は？

これが私のコードです

import javafx.application.Application; 
import javafx.beans.binding.DoubleBinding;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.shape.Line;
import javafx.stage.Stage;

public class GridMoveAndLine extends Application {

BorderPane pane;
Line       newLine;
XYChart.Series series1 = new XYChart.Series(); 

SimpleDoubleProperty rectinitX = new SimpleDoubleProperty(); 
SimpleDoubleProperty rectX = new SimpleDoubleProperty(); 
SimpleDoubleProperty rectY = new SimpleDoubleProperty(); 

double oldXLowerBound = -1;
double oldXUpperBound = -1;
double oldYLowerBound = -1;
double oldYUpperBound = -1;

@Override 
public void start(Stage stage) { 

final NumberAxis xAxis = new NumberAxis(1, 12, 1); 
final NumberAxis yAxis = new NumberAxis(0.53000, 0.53910, 0.0005); 

xAxis.setAnimated(false);
yAxis.setAnimated(false);

yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis) { 

@Override 
public String toString(Number object) { 
    return String.format("%7.5f", object); 
} 
}); 

final LineChart<Number, Number> lineChart = new LineChart<Number, Number>(xAxis, yAxis); 

lineChart.setCreateSymbols(false); 
lineChart.setAlternativeRowFillVisible(false); 
lineChart.setAnimated(false); 
lineChart.setLegendVisible(false);

series1.getData().add(new XYChart.Data(1, 0.53185)); 
series1.getData().add(new XYChart.Data(2, 0.532235)); 
series1.getData().add(new XYChart.Data(3, 0.53234)); 
series1.getData().add(new XYChart.Data(4, 0.538765)); 
series1.getData().add(new XYChart.Data(5, 0.53442)); 
series1.getData().add(new XYChart.Data(6, 0.534658)); 
series1.getData().add(new XYChart.Data(7, 0.53023)); 
series1.getData().add(new XYChart.Data(8, 0.53001)); 
series1.getData().add(new XYChart.Data(9, 0.53589)); 
series1.getData().add(new XYChart.Data(10, 0.53476)); 

pane = new BorderPane(); 
pane.setCenter(lineChart); 
Scene scene = new Scene(pane, 800, 600); 
lineChart.getData().addAll(series1); 

stage.setScene(scene);         

scene.setOnMouseClicked(mouseHandler); 
scene.setOnMouseDragged(mouseHandler); 
scene.setOnMouseEntered(mouseHandler); 
scene.setOnMouseExited(mouseHandler); 
scene.setOnMouseMoved(mouseHandler); 
scene.setOnMousePressed(mouseHandler); 
scene.setOnMouseReleased(mouseHandler); 
stage.show();

newLine = new Line(260, 35, 390, 280);
pane.getChildren().add(newLine);

oldXLowerBound = xAxis.getLowerBound();
oldXUpperBound = xAxis.getUpperBound();

DoubleBinding LineXaxisBinding = new DoubleBinding() {
{                                
    super.bind(xAxis.lowerBoundProperty(), xAxis.upperBoundProperty(),     xAxis.widthProperty());
}
@Override
protected double computeValue() {
    double chartWidthX = xAxis.getWidth();
    double axisSpanX = xAxis.getUpperBound() - xAxis.getLowerBound();
    double displacementX = (chartWidthX / axisSpanX) * ( oldXLowerBound-  xAxis.getLowerBound()  );

    return (xAxis.getDisplayPosition(xAxis.getLowerBound())+displacementX);
}
};

newLine.translateXProperty().bind(LineXaxisBinding);
} 

EventHandler<MouseEvent> mouseHandler = new EventHandler<MouseEvent>() { 

@Override 
public void handle(MouseEvent mouseEvent) { 

if (mouseEvent.getEventType() == MouseEvent.MOUSE_PRESSED) {             
    rectinitX.set(mouseEvent.getX()); 
} 
else if (mouseEvent.getEventType() == MouseEvent.MOUSE_DRAGGED ||     mouseEvent.getEventType() == MouseEvent.MOUSE_MOVED) { 
    LineChart<Number, Number> lineChart = (LineChart<Number, Number>) pane.getCenter(); 
    NumberAxis xAxis = (NumberAxis) lineChart.getXAxis(); 

    double Tgap = xAxis.getWidth()/(xAxis.getUpperBound() - xAxis.getLowerBound()); 
    double newXlower=xAxis.getLowerBound(), newXupper=xAxis.getUpperBound();             
    double Delta=0.3;

    if(mouseEvent.getEventType() == MouseEvent.MOUSE_DRAGGED){
    if(rectinitX.get() < mouseEvent.getX()){    
        newXlower=xAxis.getLowerBound()-Delta;
        newXupper=xAxis.getUpperBound()-Delta;
    }
else if(rectinitX.get() > mouseEvent.getX()){    
        newXlower=xAxis.getLowerBound()+Delta;
        newXupper=xAxis.getUpperBound()+Delta;
    }    
    xAxis.setLowerBound( newXlower ); 
    xAxis.setUpperBound( newXupper );                        
    }                                        
    rectinitX.set(mouseEvent.getX());                                 
 } 
 } 
 }; 
  public static void main(String[] args) {
    launch(args);
}
}