JavaFX Polygon rotate

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.shape.Polygon;
import javafx.scene.text.Text;
import javafx.scene.text.Font;
import javafx.scene.paint.Color;
import javafx.collections.ObservableList;

public class Main extends Application {
  @Override/*from   w w w. ja  v  a 2  s .co  m*/
  public void start(Stage primaryStage) {
    StopSign pane = new StopSign(300);

    Scene scene = new Scene(pane);
    primaryStage.setTitle("java2s.com");
    primaryStage.setScene(scene);
    primaryStage.setResizable(false);
    primaryStage.show();
  }


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

class StopSign extends StackPane {
   StopSign(double canvasSize) {
     // Create the octagon
     Polygon oct = new Polygon();
     oct.setFill(Color.RED);
     ObservableList<Double> list = oct.getPoints();

     double centerX = canvasSize / 2;
     double radius = canvasSize;

     for (int i = 0; i <= 8; i++) {
       list.add(centerX + radius * Math.cos(2 * i * Math.PI / 8));
       list.add(centerX - radius * Math.sin(2 * i * Math.PI / 8));
     }

     // Rotate so the octagon is sitting on a side
     oct.setRotate(45 / 2.0);

     // Create the sign text
     Text stop = new Text("STOP");
     stop.setFont(Font.font("Times New Roman", radius / 2));
     stop.setFill(Color.WHITE);

     getChildren().addAll(oct, stop);
   }
 }