Javafx 在折线图中使用字符串时间戳

我正在使用JavaFX。 我修改了折线图上的缩放函数示例。我在进行缩放时出现异常。我发现xAxis上的类型不匹配，它需要数字，我使用的是字符串时间戳。我如何调整它来处理xAxis上的“12:33:23”这样的时间字符串

package javafxapplication28;

import java.util.Collections;
import java.util.Random;
import static java.util.UUID.fromString;

import javafx.application.Application;
import javafx.beans.binding.BooleanBinding;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.chart.Axis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.beans.property.StringProperty;
import javafx.util.StringConverter;

public class JavaFXApplication28 extends Application {


private static final int NUM_DATA_POINTS = 1000 ;

@Override
public void start(Stage primaryStage) {
final LineChart<Number, Number> chart = createChart();

final StackPane chartContainer = new StackPane();
chartContainer.getChildren().add(chart);

final Rectangle zoomRect = new Rectangle();
zoomRect.setManaged(false);
zoomRect.setFill(Color.LIGHTSEAGREEN.deriveColor(0, 1, 1, 0.5));
chartContainer.getChildren().add(zoomRect);

setUpZooming(zoomRect, chart);

final HBox controls = new HBox(10);
controls.setPadding(new Insets(10));
controls.setAlignment(Pos.CENTER);

final Button zoomButton = new Button("Zoom");
final Button resetButton = new Button("Reset");
zoomButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
doZoom(zoomRect, chart);
}
});
resetButton.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
final NumberAxis xAxis = (NumberAxis)chart.getXAxis();

xAxis.setLowerBound(10);
xAxis.setUpperBound(200);
final NumberAxis yAxis = (NumberAxis)chart.getYAxis();
yAxis.setLowerBound(0);
yAxis.setUpperBound(200);

zoomRect.setWidth(0);
zoomRect.setHeight(0);
}


});
final BooleanBinding disableControls = 
zoomRect.widthProperty().lessThan(5)
.or(zoomRect.heightProperty().lessThan(5));
zoomButton.disableProperty().bind(disableControls);
controls.getChildren().addAll(zoomButton, resetButton);

final BorderPane root = new BorderPane();
root.setCenter(chartContainer);
root.setBottom(controls);

final Scene scene = new Scene(root, 600, 400);
primaryStage.setScene(scene);
primaryStage.show();
}

private LineChart<Number, Number> createChart() {
final NumberAxis xAxis = createAxis_x();
final NumberAxis yAxis = createAxis_y(); 
final LineChart<Number, Number> chart = new LineChart<>(xAxis, yAxis);
chart.setAnimated(false);
chart.setCreateSymbols(false);
chart.setData(generateChartData()); 
return chart ;
}

//Set range of x axis 
private NumberAxis createAxis_x() {
final NumberAxis xAxis = new NumberAxis();
xAxis.setAutoRanging(false);

String xMin = "12:30:12";
String xMax = "13:21:01";
double xminDouble = Double.parseDouble(xMin);
double xmaxDouble = Double.parseDouble(xMax);
xAxis.setLowerBound(xminDouble);
xAxis.setUpperBound(xmaxDouble);

return xAxis;
}

//Set range of y axis
private NumberAxis createAxis_y() {
final NumberAxis yAxis = new NumberAxis();
yAxis.setAutoRanging(false);

String yMin = "40";
String yMax = "400";
double yminDouble = Double.parseDouble(yMin);
double ymaxDouble = Double.parseDouble(yMax);

yAxis.setLowerBound(yminDouble);
yAxis.setUpperBound(ymaxDouble);

return yAxis;
}


private ObservableList<Series<Number, Number>> generateChartData() {
final Series<Number, Number> series = new Series<>();
series.setName("Data");
final Random rng = new Random();
for (int i=0; i<NUM_DATA_POINTS; i++) {
Data<Number, Number> dataPoint = new Data<Number, Number>(i, rng.nextInt(1000));
series.getData().add(dataPoint);
}
return FXCollections.observableArrayList(Collections.singleton(series));
}

private void setUpZooming(final Rectangle rect, final Node zoomingNode) {
final ObjectProperty<Point2D> mouseAnchor = new SimpleObjectProperty<>();
zoomingNode.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
mouseAnchor.set(new Point2D(event.getX(), event.getY()));
rect.setWidth(0);
rect.setHeight(0);
}
});
zoomingNode.setOnMouseDragged(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
double x = event.getX();
double y = event.getY();
rect.setX(Math.min(x, mouseAnchor.get().getX()));
rect.setY(Math.min(y, mouseAnchor.get().getY()));
rect.setWidth(Math.abs(x - mouseAnchor.get().getX()));
rect.setHeight(Math.abs(y - mouseAnchor.get().getY()));
}
});
}

private void doZoom(Rectangle zoomRect, LineChart<Number, Number> chart) {
Point2D zoomTopLeft = new Point2D(zoomRect.getX(), zoomRect.getY());
Point2D zoomBottomRight = new Point2D(zoomRect.getX() + zoomRect.getWidth(), zoomRect.getY() + zoomRect.getHeight());
final NumberAxis yAxis = (NumberAxis) chart.getYAxis();
Point2D yAxisInScene = yAxis.localToScene(0, 0);
final NumberAxis xAxis = (NumberAxis) chart.getXAxis();
System.out.println(xAxis);
Point2D xAxisInScene = xAxis.localToScene(0, 0);
double xOffset = zoomTopLeft.getX() - yAxisInScene.getX() ;
double yOffset = zoomBottomRight.getY() - xAxisInScene.getY();
double xAxisScale = xAxis.getScale();
double yAxisScale = yAxis.getScale();
xAxis.setLowerBound(xAxis.getLowerBound() + xOffset / xAxisScale);
xAxis.setUpperBound(xAxis.getLowerBound() + zoomRect.getWidth() / xAxisScale);
yAxis.setLowerBound(yAxis.getLowerBound() + yOffset / yAxisScale);
yAxis.setUpperBound(yAxis.getLowerBound() - zoomRect.getHeight() / yAxisScale);
System.out.println(yAxis.getLowerBound() + " " + yAxis.getUpperBound());
zoomRect.setWidth(0);
zoomRect.setHeight(0);
}

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

谢谢你的帮助

String xMin = "40";
String xMax = "300";