FlagPane

package flag;

import javafx.collections.ObservableList;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.scene.shape.Rectangle;

public class FlagPane extends Pane {
    private void paint() {
        this.getChildren().clear();

        // Stripes
        for (int i = 0; i < 7; i++) {

            Rectangle stripe = new Rectangle();
            stripe.setX(10);
            stripe.setWidth(getWidth() - 20);
            stripe.setHeight((getHeight() - 20) / 13.0);
            stripe.setY((getHeight() - 20) / 13.0 * (2 * i) + 10);
            stripe.setFill(Color.RED);

            this.getChildren().add(stripe);
        }

        // Blue Box
        Rectangle box = new Rectangle();
        box.setX(10);
        box.setY(10);
        box.setWidth(2 * (getWidth() - 20) / 5);
        box.setHeight(7 * (getHeight() - 21) / 13);
        box.setFill(Color.DARKBLUE);

        this.getChildren().add(box);

        // Stars
        double heightChange = 10;
        double heightChange2 = 10;
        double widthChange = 10;

        for (int i = 0; i < 5; i++){
            for (int j = 0; j < 6; j++)
                genStar(heightChange, widthChange + (j * (getWidth()*0.0625)));
            heightChange = heightChange + (getHeight() * 0.0950);
        }
        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 5; j++)
                genStar2(heightChange2, widthChange + (j * (getWidth()*0.0625)));
            heightChange2 = heightChange2 + (getHeight() * 0.0950);
        }
    }

    private void genStar(Double heightChange, Double widthChange){
        double radius = (getHeight() - 20) * 0.025;
        double radius2 = radius / 2.8;
        Polygon star = new Polygon();
        ObservableList<Double> list = star.getPoints();
        for (int j = 0; j < 9; j ++){
            if (j % 2 == 0){
                list.add(((getWidth() - 20) * 0.0332) + radius * Math.cos(2*j*Math.toRadians(36)) + widthChange);
                list.add(((getHeight() - 20) * 0.054) - radius * Math.sin(2*j*Math.toRadians(36)) + heightChange);
            }else{
                list.add(((getWidth() - 20) * 0.0332) + radius2 * Math.cos(2*j*Math.toRadians(36)) + widthChange);
                list.add(((getHeight() - 20) * 0.054) - radius2 * Math.sin(2*j*Math.toRadians(36)) + heightChange);
            }
        }
        star.setRotate(-18);
        star.setFill(Color.WHITE);
        this.getChildren().add(star);
    }

    private void genStar2(Double heightChange, Double widthChange){
        double radius = (getHeight() - 20) * 0.025;
        double radius2 = radius / 2.8;
        Polygon star = new Polygon();
        ObservableList<Double> list = star.getPoints();
        for (int j = 0; j < 9; j ++){
            if (j % 2 == 0){
                list.add(((getWidth() - 20) * 0.0664) + radius * Math.cos(2*j*Math.toRadians(36)) + widthChange);
                list.add(((getHeight() - 20) * 0.108) - radius * Math.sin(2*j*Math.toRadians(36)) + heightChange);
            }else{
                list.add(((getWidth() - 20) * 0.0664) + radius2 * Math.cos(2*j*Math.toRadians(36)) + widthChange);
                list.add(((getHeight() - 20) * 0.108) - radius2 * Math.sin(2*j*Math.toRadians(36)) + heightChange);
            }
        }
        star.setRotate(-18);
        star.setFill(Color.WHITE);
        this.getChildren().add(star);
    }

    @Override
    public void setWidth(double width) {
        super.setWidth(width);
        paint();
    }

    @Override
    public void setHeight(double height) {
        super.setHeight(height);
        paint();
    }
}