JavaFX - Movable Line

line-view.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.HBox?>


<AnchorPane fx:id="anchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/18.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.movableline.LineController">
   <children>
      <HBox layoutX="152.0" layoutY="326.0" spacing="200.0">
         <children>
            <Button mnemonicParsing="false" onAction="#addLine" text="Add" />
            <Button mnemonicParsing="false" onAction="#removeLine" text="Remove" />
         </children>
      </HBox>
   </children>
</AnchorPane>

LineApplication.java

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;

import java.io.IOException;

public class LineApplication extends Application {
    @Override
    public void start(Stage stage) throws IOException {
        FXMLLoader fxmlLoader = new FXMLLoader(LineApplication.class.getResource("line-view.fxml"));
        Scene scene = new Scene(fxmlLoader.load());
        stage.setTitle("Hello!");
        stage.setScene(scene);
        stage.show();
    }

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

LineController.java

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.layout.AnchorPane;

import java.util.ArrayList;
import java.util.List;

public class LineController {

    List<MovableLine> lines = new ArrayList<>();

    @FXML
    private AnchorPane anchorPane;

    @FXML
    void addLine(ActionEvent event) {
        MovableLine newLine = new MovableLine(anchorPane);
        lines.add(newLine);
    }

    @FXML
    void removeLine(ActionEvent event) {
        MovableLine currentLine = lines.get(0);
        lines.remove(0);
        currentLine.removeLineFrom(anchorPane);
    }
}

MovableLine.java

import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Line;

public class MovableLine {

    Line line;
    Circle startPoint, endPoint;

    public MovableLine(Pane root) {
        createDraggableLine(root);
    }

    private void createDraggableLine(Pane root){
        // Create the line
        line = new Line(50, 50, 100, 100);
        line.setStroke(Color.BLACK);
        line.setStrokeWidth(2);

        // Create the start and end points
        startPoint = createDraggablePoint(line.getStartX(), line.getStartY());
        endPoint = createDraggablePoint(line.getEndX(), line.getEndY());

        // Add mouse event handlers for dragging
        startPoint.setOnMouseDragged(e -> handlePointMouseDragged(e, line, true));
        endPoint.setOnMouseDragged(e -> handlePointMouseDragged(e, line, false));

        root.getChildren().addAll(line, startPoint, endPoint);
    }

    private void handlePointMouseDragged(MouseEvent event, Line line, Boolean startPoint) {
        Circle point = (Circle) event.getSource();
        double offsetX = event.getX();
        double offsetY = event.getY();
        point.setCenterX(offsetX);
        point.setCenterY(offsetY);
        point.setLayoutX(event.getSceneX() - offsetX);
        point.setLayoutY(event.getSceneY() - offsetY);

        if (startPoint) {
            line.setStartX(offsetX);
            line.setStartY(offsetY);
        } else {
            line.setEndX(offsetX);
            line.setEndY(offsetY);
        }
    }

    private Circle createDraggablePoint(double x, double y) {
        Circle point = new Circle(x, y, 5, Color.RED);
        point.setStroke(Color.BLACK);
        point.setStrokeWidth(1);
        point.setCenterX(x);
        point.setCenterY(y);
        return point;
    }


    public void removeLineFrom(Pane root){
        root.getChildren().remove(line);
        root.getChildren().remove(startPoint);
        root.getChildren().remove(endPoint);
    }
}