66. CheckBox

Like the previous example, we can select triangle, square or pentagon, by selecting the appropriate CheckBox.

Now we can select more than one choice.

---

package ex66;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.stage.Stage;

public class Ex66 extends Application {

    final int RADIUS = 100;
    
    @Override
    public void start(Stage stage) {
                        
        VBox root = new VBox(20);
        root.setAlignment(Pos.CENTER);
        
        HBox hbox = new HBox(50);
        hbox.setAlignment(Pos.CENTER);
        
        CheckBox triangleCB = new CheckBox("Triangle");
        CheckBox squareCB = new CheckBox("Square  ");
        CheckBox pentagonCB = new CheckBox("Pentagon ");
        hbox.getChildren().setAll(triangleCB, squareCB,
                pentagonCB);
        
        Polygon triangle = new Polygon(getDouble(3));
        triangle.setFill(Color.RED);
        
        Polygon square = new Polygon(getDouble(4));
        square.setFill(Color.BLUE);
        
        Polygon pentagon = new Polygon(getDouble(5));
        pentagon.setFill(Color.GREEN);
        
        triangle.visibleProperty().bind(
                triangleCB.selectedProperty());
        square.visibleProperty().bind(
                squareCB.selectedProperty());
        pentagon.visibleProperty().bind(
                pentagonCB.selectedProperty());
        
        root.getChildren().addAll(hbox,
                triangle, square, pentagon);
        
        Scene scene = new Scene(root, 400, 800, Color.CORNSILK);
        stage.setTitle("Example 66. CheckBox");
        
        stage.setScene(scene);
        stage.show();
    }
    
    private double[] getDouble (int n) {
        double[] array = new double[2*n];
        for (int i = 0; i<n; i++){
            array[2*i] = RADIUS*Math.cos(2*Math.PI/n*i);
            array[2*i+1]=RADIUS*Math.sin(2*Math.PI/n*i);
        }
        return array;
    }
    
    public static void main(String[] args) {
        launch();
    }
}

---

This is the output after selecting triangle and pentagon:

---