JavaFX Application create fan animation

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Slider;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Arc;
import javafx.scene.shape.ArcType;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {

   @Override//from   ww  w.  j  a va  2s  .  c om
   public void start(Stage primaryStage) throws Exception {

      BorderPane[] borderPanes = new BorderPane[3];
      FanPane[] fanPanes = new FanPane[3];

      for (int i = 0; i < borderPanes.length; i++) {
         fanPanes[i] = new FanPane(100);
         borderPanes[i] = new BorderPane(fanPanes[i]);
         borderPanes[i].setTop(fanPanes[i].hButtons);
         borderPanes[i].setBottom(fanPanes[i].scrollPane);
         borderPanes[i].setStyle("-fx-border-color: black;");
      }

      // center pane
      HBox hFans = new HBox(borderPanes);

      // bottom pane
      Button btStartAll = new Button("Start All");
      btStartAll.setOnAction(e -> {
         for (FanPane fan : fanPanes) {
            if (fan.fanTimeline.getStatus() != Animation.Status.RUNNING) {
               fan.playPause.fire();
            }
         }
      });
      Button btStopAll = new Button("Stop All");
      btStopAll.setOnAction(e -> {
         for (FanPane fan : fanPanes) {
            if (fan.fanTimeline.getStatus() == Animation.Status.RUNNING) {
               fan.stop();
            }
         }
      });
      HBox bottomPane = new HBox(btStartAll, btStopAll);
      bottomPane.setSpacing(10);
      bottomPane.setPadding(new Insets(5));

      bottomPane.setAlignment(Pos.CENTER);

      primaryStage.setScene(new Scene(new BorderPane(hFans, null, null, bottomPane, null)));
      primaryStage.setTitle("Fan");
      primaryStage.show();

   }

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

   private class FanPane extends Pane {

      private Circle c;
      private Arc[] blades = new Arc[4];
      private double increment = 1;

      // Buttons
      Button playPause = new Button("Play/Pause");
      Button increase = new Button("Increase");
      Button decrease = new Button("Decrease");
      Button reverse = new Button("Reverse");

      HBox hButtons = new HBox(playPause, increase, decrease, reverse);
      Timeline fanTimeline;

      Slider mSlider = new Slider();
      HBox scrollPane = new HBox(mSlider);

      FanPane(double radius) {
         double w = radius * 4;
         double h = radius * 2;

         setMinWidth(w);
         setMinHeight(h + radius);
         c = new Circle(w / 2, h / 2 + (radius / 2), radius, Color.TRANSPARENT);
         c.setStroke(Color.BLACK);

         double bladeRadius = radius * 0.9;
         for (int i = 0; i < blades.length; i++) {
            blades[i] = new Arc(c.getCenterX(), c.getCenterY(), // center point
                  bladeRadius, bladeRadius, // X and Y radius
                  (i * 90) + 30, 35); // start angle and length
            blades[i].setFill(Color.RED);
            blades[i].setType(ArcType.ROUND);
         }

         getChildren().addAll(c);
         getChildren().addAll(blades);

         KeyFrame keyFrame = new KeyFrame(Duration.millis(10), e -> spin());

         fanTimeline = new Timeline(keyFrame);
         fanTimeline.setCycleCount(Timeline.INDEFINITE);

         // Buttons Play/pause, increase, decrease, reverse
         playPause.setOnAction(e -> {
            if (fanTimeline.getStatus() == Animation.Status.RUNNING) {
               fanTimeline.pause();
            } else {
               fanTimeline.play();
            }
         });

         increase.setOnAction(e -> {
            fanTimeline.setRate(fanTimeline.getCurrentRate() + 1);
            mSlider.setValue(fanTimeline.getCurrentRate());
         });

         decrease.setOnAction(e -> {
            fanTimeline.setRate((fanTimeline.getCurrentRate() - 1 < 0) ? 0 : fanTimeline.getCurrentRate() - 1);
            mSlider.setValue(fanTimeline.getCurrentRate());

         });
         mSlider.setMin(0);
         mSlider.setMax(35);
         mSlider.valueProperty().addListener(e -> {
            final double direction = (fanTimeline.getCurrentRate() >= 0) ? 1 : -1;
            fanTimeline.setRate(mSlider.getValue() * direction);
         });
         mSlider.setMinWidth(200);
         scrollPane.setAlignment(Pos.CENTER);
         scrollPane.setPadding(new Insets(5));

         reverse.setOnAction(e -> increment *= -1);
         hButtons.setSpacing(5);
         hButtons.setAlignment(Pos.CENTER);
         hButtons.setPadding(new Insets(2, 2, 2, 2));

      }

      private void spin() {
         for (Arc blade : blades) {
            double prevStartAngle = blade.getStartAngle();
            blade.setStartAngle(prevStartAngle - increment);
         }
      }

      private void stop() {
         fanTimeline.stop();
      }

   }
}