Natour, O. 4/7/16 Csc-112 Control Polygon

/*
 * Omar Natour
 * 4/7/2016
 * Csc-112 Java 2
 * Hw#13
 * Create buttons that increase and decrease the amount of sides a regular polygon has
 * [email protected]
 */

import javafx.application.Application;
import java.lang.Math;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
import javafx.scene.layout.*;
import javafx.scene.shape.*;
import javafx.scene.paint.Color;

public class Control extends Application {
   BorderPane pane = new BorderPane();
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {

        pane.setCenter(Poly.getPolygon());
        pane.setBottom(bottom());

        Scene sce = new Scene(pane, 300, 300);

        primaryStage.setTitle("Polygons");
        primaryStage.setScene(sce);
        primaryStage.show();
        primaryStage.setResizable(false);
    }

    public Pane bottom() {

        HBox bottom = new HBox(50);

        Button btPlus = new Button("+");
        btPlus.setPrefHeight(15);
        btPlus.setPrefWidth(50);

        Button btMinus = new Button("-");
        btMinus.setPrefHeight(15);
        btMinus.setPrefWidth(50);

        bottom.getChildren().add(btPlus);
        bottom.getChildren().add(btMinus);
        bottom.setPadding(new Insets(0, 75, 10, 75));

        btPlus.setOnAction(e -> pane.setCenter(Poly.enlarge()));
        btMinus.setOnAction(e -> pane.setCenter(Poly.shrink()));

        return bottom;
    }
}

class Poly {
     static int sides = 6;
      static StackPane getPolygon() {

        StackPane shape = new StackPane();

        Polygon regular = new Polygon();
        regular.setFill(Color.TRANSPARENT);
        regular.setStroke(Color.BLACK);

        double theta = 2 * Math.PI / sides;
        double[] x = new double[sides];
        double[] y = new double[sides];

        for (int i = 0; i < sides; i++) {
            x[i] = Math.cos(theta * i) * 105;
            y[i] = Math.sin(theta * i) * 105;

            regular.getPoints().addAll((x[i]), (y[i]));
        }
        shape.getChildren().add(regular);

        return shape;
    }

    public static  Pane enlarge() {
        sides += 1;
        return getPolygon();
    }

    public static  Pane shrink() {
        if (sides <= 3)
            return getPolygon();
        sides -= 1;
        return getPolygon();
    }
}