JavaFX Draw the American Flag (No Scalability

// Antonio Silvestri
// 03/26/17
// HW7 Draw the American Flag (No Scalability)
// CSC-112 Intermediate Java Programming
// silvestri@stcc.edu

import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class USFlag extends Application {
    @Override // Override the start method in the Application class
    public void start(Stage primaryStage) {
        Scene scene = new Scene(new USFlagPane());
        primaryStage.setTitle("Make America Great Again!!!");
        primaryStage.setScene(scene);
        primaryStage.setResizable(false);
        primaryStage.show();
    }

    /**
     * The main method is only needed for the IDE with limited JavaFX support.
     * Not needed for running from the command line.
     */
    public static void main(String[] args) {
        launch(args);
    }
}

// ****************************************************************************

class USFlagPane extends Pane {
    private static final double PANEWIDTH = 570;
    private static final double PANEHEIGHT = 310;
    private static final double BLUEWIDTH = 240;
    private static final double BLUEHEIGHT = 160;

    public USFlagPane() {
        this.setPrefSize(PANEWIDTH, PANEHEIGHT);

        // Draw Red Stripes
        double y = 0;
        for (int i = 0; i < 7; i++) {
            Rectangle r = new Rectangle(10, 10 + y, 550, 160.0 / 7.0);
            r.setFill(Color.RED);
            y += 2 * 160.0 / 7;
            this.getChildren().add(r);
        }

        // Draw Sea of Blue
        Rectangle rectangle = new Rectangle(10, 10, BLUEWIDTH, BLUEHEIGHT);
        rectangle.setFill(Color.BLUE);
        this.getChildren().add(rectangle);

        // Draw Stars
        int centerX = 30;
        int centerY = 30;
        int radius = 10;

        for (int j = 0; j < 5; j++) {
            for (int i = 0; i < 6; i++) {
                this.getChildren().addAll(getStar(centerX, centerY, radius));
                centerX += 40;
            }
            centerX = 30;
            centerY += 30;
        }

        centerX = 50;
        centerY = 45;
        for (int j = 0; j < 4; j++) {
            for (int i = 0; i < 5; i++) {
                this.getChildren().addAll(getStar(centerX, centerY, radius));
                centerX += 40;
            }
            centerX = 50;
            centerY += 30;
        }
    }

    private Polygon getStar(double centerX, double centerY, double radius) {
        Polygon polygon = new Polygon();
        polygon.setFill(Color.WHITE);
        polygon.setStroke(Color.BLACK);

        double a = 2 * Math.PI / 20;
        double b = 2 * Math.PI / 10;

        double h1 = radius * Math.sin(a);
        double r2 = h1 / Math.sin(a + b); // The radius of the inner points

        ObservableList<Double> list = polygon.getPoints();

        // Add points to the polygon
        double angle = 2 * Math.PI / 20;
        double angle1 = -2 * Math.PI / 20 + 2 * Math.PI / 5;
        for (int i = 0; i < 5; i++) {
            // Add outer point
            list.add(centerX + radius * Math.cos(angle));
            list.add(centerY - radius * Math.sin(angle));
            angle += 2 * Math.PI / 5;

            // Add inner point
            list.add(centerX + r2 * Math.cos(angle1));
            list.add(centerY - r2 * Math.sin(angle1));
            angle1 += 2 * Math.PI / 5;
        }
        return polygon;
    }
}