Exercise15_01.java

package ch_15;

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 * *15.1 (Pick four cards) Write a program that lets the user click the Refresh button to
 * display four cards from a deck of 52 cards, as shown in Figure 15.24a. (See the
 * hint in Programming Exercise 14.3 on how to obtain four random cards.)
 */
public class Exercise15_01 extends Application {
    String[] cards;
    int[] picked = new int[4];
    int pick = 0;

    private void setCards() {
        cards = new String[52];
        int cardNum = 1;
        for (int i = 0; i < cards.length; i++) {
            String path = "resources/cards/" + cardNum + ".png";
            cards[i] = path;
            cardNum++;

        }

    }


    @Override
    public void start(Stage primaryStage) throws Exception {
        setCards();
        VBox vbox = new VBox();
        HBox cardBox = new HBox();
        HBox buttonBar = new HBox();
        vbox.setFillWidth(true);

        Image i1 = new Image(cards[randomCard()]);
        Image i2 = new Image(cards[randomCard()]);
        Image i3 = new Image(cards[randomCard()]);
        Image i4 = new Image(cards[randomCard()]);


        ImageView card1 = new ImageView(i1);
        card1.setPreserveRatio(true);
        card1.setFitHeight(300);

        ImageView card2 = new ImageView(i2);
        card2.setPreserveRatio(true);
        card2.setFitHeight(300);

        ImageView card3 = new ImageView(i3);
        card3.setPreserveRatio(true);
        card3.setFitHeight(300);

        ImageView card4 = new ImageView(i4);
        card4.setPreserveRatio(true);
        card4.setFitHeight(300);

        Button refreshButton = new Button("Refresh");
        refreshButton.setOnAction(e -> {
            refreshCards(cardBox);
        });

        buttonBar.getChildren().add(refreshButton);
        buttonBar.setAlignment(Pos.CENTER);

        cardBox.getChildren().addAll(card1, card2, card3, card4);
        vbox.getChildren().add(cardBox);
        vbox.getChildren().add(buttonBar);
        Scene scene = new Scene(vbox);
        primaryStage.setScene(scene);
        primaryStage.show();

    }

    private void refreshCards(HBox hBox) {
        pick = 0;
        Image i1 = new Image(cards[randomCard()]);
        Image i2 = new Image(cards[randomCard()]);
        Image i3 = new Image(cards[randomCard()]);
        Image i4 = new Image(cards[randomCard()]);

        ImageView card1 = new ImageView(i1);
        card1.setPreserveRatio(true);
        card1.setFitHeight(300);

        ImageView card2 = new ImageView(i2);
        card2.setPreserveRatio(true);
        card2.setFitHeight(300);

        ImageView card3 = new ImageView(i3);
        card3.setPreserveRatio(true);
        card3.setFitHeight(300);

        ImageView card4 = new ImageView(i4);
        card4.setPreserveRatio(true);
        card4.setFitHeight(300);
        hBox.getChildren().setAll(card1, card2, card3, card4);
    }

    int randomCard() {
        int ran = -1;
        do {
            ran = (int) (Math.random() * 52);

        } while (ran == picked[0] || ran == picked[1] || ran == picked[2] || ran == picked[3]);

        picked[pick++] = ran;
        return ran;
    }

}