tictactoe.java

package sample;

import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Text;
import javafx.scene.text.TextAlignment;
import javafx.stage.Stage;

enum Player {
    BLUE,
    RED
}

enum State {
    ACTIVE,
    FINISHED
}

class Block extends Rectangle {
    private Color color;
    public Block(double x, double y, double width, double height){
        super(x, y, width, height);
        color = Color.WHITE;
    }
    public Color getColor(){
        return color;
    }
    public void setColor(Color c){
        color = c;
        this.setFill(c);
    }
}

public class Main extends Application {

    State state = State.ACTIVE;

    Player active = Player.BLUE;
    Text t = new Text(200, 50, "T3 game");
    Block array[][] = new Block[3][3]; // rows, columns

    private boolean checkWinner() {
        for (int row = 0; row <= 2; row++) {
            if (array[row][0].getColor() != Color.WHITE && array[row][0].getColor() == array[row][1].getColor() && array[row][1].getColor() == array[row][2].getColor()) {
                // colors match for this row
                return true;
            }
        }
        for (int column = 0; column <= 2; column++) {
            if (array[0][column].getColor() != Color.WHITE && array[0][column].getColor() == array[1][column].getColor() && array[1][column].getColor() == array[2][column].getColor()) {
                // colors match for this column
                return true;
            }
        }
        //diagonals
        //topleft, bottom right
        if (array[0][0].getColor() != Color.WHITE && array[0][0].getColor() == array[1][1].getColor() && array[1][1].getColor() == array[2][2].getColor()) {
            // colors match for this column
            return true;
        }
        //topright, bottom left
        else if (array[0][2].getColor() != Color.WHITE && array[0][2].getColor() == array[1][1].getColor() && array[1][1].getColor() == array[2][0].getColor()) {
            // colors match for this column
            return true;
        }
        return false;
    }

    private boolean checkTie(){
        int filledCount = 0;
        for (int y = 0; y <= 2; y++) {
            for (int x = 0; x <= 2; x++) {
                if(array[y][x].getColor() != Color.WHITE){
                    filledCount++;
                }
            }
        }
        return filledCount == 9 ? true : false;
    }

    // Game logic
    EventHandler clickHandler = e -> {

        // Resetting the playing field
        if (state == State.FINISHED) {
            state = State.ACTIVE;
            for (int y = 0; y <= 2; y++) {
                for (int x = 0; x <= 2; x++) {
                    array[y][x].setColor(Color.WHITE);
                }
            }
            t.setText("T3 game");
        }

        Block target = (Block) e.getTarget();
        if(target.getColor() != Color.WHITE){
            return;
        }

        if (active == Player.BLUE) {
            target.setColor(Color.BLUE);
            active = Player.RED;
        } else if (active == Player.RED) {
            target.setColor(Color.RED);
            active = Player.BLUE;
        }
        if (checkWinner()) {
            t.setText(target.getColor() == Color.RED ? "Red has won!" : "Blue has won!");
            state = State.FINISHED;

        }else if(checkTie()){
            t.setText("TIE!");
            state = State.FINISHED;
        }
    };

    @Override
    public void start(Stage primaryStage) throws Exception {
        Pane p = new Pane();
        primaryStage.setTitle("Hello World");
        t.setStyle("-fx-font: 24 arial");
        p.getChildren().add(t);

        for (int y = 0; y <= 2; y++) {
            for (int x = 0; x <= 2; x++) {
                Block r = new Block(x * 100 + 100, y * 100 + 100, 100, 100);
                r.setColor(Color.WHITE);
                r.setStroke(Color.DARKGRAY);

                r.setOnMouseClicked(clickHandler);
                array[y][x] = r;
                p.getChildren().add(r);
            }
        }


        primaryStage.setScene(new Scene(p, 500, 500));
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}