JavaFX从LineChart获取coords x，y点

Question

我遇到LineChart的问题。我的代码：

package test;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.chart.Chart;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.shape.Path;
import javafx.scene.shape.Shape;
import javafx.stage.Stage;

public class SampleLineChart extends Application {
    public LineChart<Number, Number> lineChart;
    public Button button = new Button();
    public XYChart.Series series;

    @Override public void start(Stage stage) {
        stage.setTitle("Line Chart Sample");
        // defining the axes
        final NumberAxis xAxis = new NumberAxis();
        final NumberAxis yAxis = new NumberAxis();
        xAxis.setLabel("Number of Month");
        // creating the chart
        lineChart = new LineChart<Number, Number>(xAxis, yAxis);

        lineChart.setTitle("Stock Monitoring, 2010");
        // defining a series
        series = new XYChart.Series();
        series.setName("My portfolio");
        // populating the series with data
        series.getData().add(new XYChart.Data<Integer, Integer>(1, 23));
        series.getData().add(new XYChart.Data<Integer, Integer>(2, 14));
        series.getData().add(new XYChart.Data<Integer, Integer>(3, 15));
        series.getData().add(new XYChart.Data<Integer, Integer>(4, 24));
        series.getData().add(new XYChart.Data<Integer, Integer>(5, 34));
        series.getData().add(new XYChart.Data<Integer, Integer>(6, 36));
        series.getData().add(new XYChart.Data<Integer, Integer>(7, 22));
        series.getData().add(new XYChart.Data<Integer, Integer>(8, 45));
        series.getData().add(new XYChart.Data<Integer, Integer>(9, 43));
        series.getData().add(new XYChart.Data<Integer, Integer>(10, 17));
        series.getData().add(new XYChart.Data<Integer, Integer>(11, 29));
        series.getData().add(new XYChart.Data<Integer, Integer>(12, 25));
        lineChart.setCreateSymbols(false);
        Pane pane = new Pane();
        HBox hbox = new HBox();
        hbox.getChildren().add(lineChart);
        button = new Button("Naciśnij");
        hbox.getChildren().add(button);
        button.setOnAction(new EventHandler<ActionEvent>() {

            public void handle(ActionEvent arg0) {
                System.out.println("Get cords");


            }
        });
        pane.getChildren().add(hbox);

        Scene scene = new Scene(pane, 800, 600);
        lineChart.getData().add(series);
        Shape shape = lineChart.getShape();

        stage.setScene(scene);
        stage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }
}

当我点击Button时，我需要从lineChart获取坐标x，y点。在调试模式下，我可以读取lineChart-＆gt; children-＆gt; list-＆gt; backingList-＆gt; elementData-＆gt;图表$ 1-＆gt; children-＆gt; list-＆gt; backlist-＆gt; XYChart $ 1 - ＆gt的coords ;儿童 - ＆gt;列表 - ＆gt; backingList - ＆gt; elementData - ＆gt;路径[3]。 但我不知道如何编写代码来获取坐标？

----我的解决----

package test;

import java.util.Random;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;

public class SampleLineChart extends Application {


    private XYChart.Series<Number, Number> series = new XYChart.Series<>();
    private NumberAxis yAxis;
    private NumberAxis xAxis;
    private double yShift;
    private double xShift;
    Pane pane;
    private void Coords() {
        int index = 0;
        for (Data<Number, Number> value : series.getData()) {
            System.out.println("Coord #" + index);
            double x=xShift + xAxis.getDisplayPosition(value.getXValue().doubleValue());
            double y=yShift + yAxis.getDisplayPosition(value.getYValue().doubleValue());
            System.out.println(x);
            System.out.println(y);
            index++;
        }
    }

    @Override public void start(Stage stage) {
        LineChart<Number, Number> chart = new LineChart<>(xAxis = new NumberAxis(0, 100, 10), yAxis = new NumberAxis(0, 100, 10));

        series.getData().add(new XYChart.Data(0, 0));
        series.getData().add(new XYChart.Data(1, 2));
        series.getData().add(new XYChart.Data(2, 14));
        series.getData().add(new XYChart.Data(4, 18));
        series.getData().add(new XYChart.Data(10, 20));

        chart.getData().addAll(series);
        pane = new Pane();
        pane.getChildren().addAll(chart);
        Scene scene = new Scene(pane);

        // add new value on mouseclick for testing
        chart.setOnMouseClicked(new EventHandler<MouseEvent>() {
            @Override public void handle(MouseEvent t) {
                series.getData().add(new XYChart.Data(series.getData().size() * 10, 30 + 50 * new Random().nextDouble()));
                Coords();
            }
        });

        stage.setScene(scene);
        stage.show();

        // find chart area Node
        Node chartArea = chart.lookup(".chart-plot-background");
        Bounds chartAreaBounds = chartArea.localToScene(chartArea.getBoundsInLocal());
        // remember scene position of chart area
        yShift = chartAreaBounds.getMinY();
        xShift = chartAreaBounds.getMinX();
        // set x parameters of the valueMarker to chart area bounds
        Coords();
    }

    public static void main(String[] args) {
        launch();
    }
}