Changing a drop shadow with sliders

Controller.java

package sample;

import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Slider;
import javafx.scene.shape.Polygon;
import javafx.scene.effect.DropShadow;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    @FXML
    private Polygon triangle;

    @FXML
    private Slider radiusSlider;

    @FXML
    private Slider offsetXSlider;

    @FXML
    private Slider offsetYSlider;

    DropShadow dropShadow = new DropShadow();


    @Override
    public void initialize(URL url, ResourceBundle resourceBundle) {
        triangle.setEffect(dropShadow);


        radiusSlider.valueProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observableValue, Number number, Number t1) {
                dropShadow.setRadius(radiusSlider.getValue());
            }
        });

        offsetXSlider.valueProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observableValue, Number number, Number t1) {
                dropShadow.setOffsetX(offsetXSlider.getValue());
            }
        });

        offsetYSlider.valueProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observableValue, Number number, Number t1) {
                dropShadow.setOffsetY(offsetYSlider.getValue());
            }
        });

        offsetXSlider.valueProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observableValue, Number number, Number t1) {

            }
        });

    }



}

Main.java

package sample;

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

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }


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

sample.fxml

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

<?import javafx.scene.control.Slider?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.shape.Polygon?>
<?import javafx.scene.text.Text?>


<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" style="-fx-background-color: #EAF4D3;" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <Polygon fx:id="triangle" fill="DODGERBLUE" layoutX="364.0" layoutY="210.0" points="-50.0, 40.0, 50.0, 40.0, 0.0, -60.0" stroke="BLACK" strokeType="INSIDE" strokeWidth="0.0" />
      <VBox layoutX="94.0" layoutY="119.0" prefHeight="200.0" prefWidth="138.0" spacing="5.0">
         <children>
            <Slider fx:id="radiusSlider" showTickLabels="true" showTickMarks="true" />
            <Slider fx:id="offsetXSlider" min="-100.0" showTickLabels="true" showTickMarks="true" />
            <Slider fx:id="offsetYSlider" min="-100.0" showTickLabels="true" showTickMarks="true" />
         </children>
      </VBox>
      <VBox layoutX="36.0" layoutY="119.0" prefHeight="200.0" prefWidth="58.0" spacing="30.0">
         <children>
            <Text strokeType="OUTSIDE" strokeWidth="0.0" text="Radius" />
            <Text layoutX="10.0" layoutY="23.0" strokeType="OUTSIDE" strokeWidth="0.0" text="X offset" />
            <Text layoutX="10.0" layoutY="40.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Y offSet" />
         </children>
      </VBox>
   </children>
</AnchorPane>