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SnakeGame.java
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SnakeGame.java
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package org.snake.model;
import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;
/**
* The main class for the Snake game.
*
* @author vlasival
*/
public class SnakeGame extends Application {
static final int WIDTH = 30;
static final int HEIGHT = 20;
static final int CELL_SIZE = 20;
static Timeline timeline;
private Pane pane;
private Snake snake;
private Food food;
private boolean isMoving = false;
/**
* Starts the game.
*
* @param primaryStage the primary stage for the game
*/
@Override
public void start(Stage primaryStage) {
pane = new Pane();
pane.setPrefSize(WIDTH * CELL_SIZE, HEIGHT * CELL_SIZE);
pane.setStyle("-fx-background-color: #83bf00");
timeline = new Timeline(new KeyFrame(Duration.millis(100), e -> {
update();
}));
timeline.setCycleCount(Animation.INDEFINITE);
Scene scene = new Scene(pane);
scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent event) {
if (isMoving) {
return;
}
isMoving = true;
KeyCode code = event.getCode();
if (code == KeyCode.LEFT) {
snake.turnLeft();
} else if (code == KeyCode.RIGHT) {
snake.turnRight();
} else if (code == KeyCode.UP) {
snake.turnUp();
} else if (code == KeyCode.DOWN) {
snake.turnDown();
}
}
});
snake = new Snake();
Element head = snake.getHead();
drawRectangle(Color.GREEN, head.getX(), head.getY());
food = new Food();
food.generateNew(WIDTH, HEIGHT);
drawRectangle(Color.RED, food.getX(), food.getY());
primaryStage.setScene(scene);
primaryStage.show();
timeline.play();
}
/**
* Draws a rectangle on the game board.
*
* @param color the color of the rectangle
* @param x the x-coordinate of the rectangle
* @param y the y-coordinate of the rectangle
*/
private void drawRectangle(Color color, double x, double y) {
Rectangle rect = new Rectangle(
x * CELL_SIZE,
y * CELL_SIZE,
CELL_SIZE,
CELL_SIZE
);
rect.setFill(color);
pane.getChildren().add(rect);
}
/**
* Updates the game screen every frame.
*/
private void updateScreen() {
pane.getChildren().clear();
for (Element element : snake.getElements()) {
drawRectangle(Color.GREEN, element.getX(), element.getY());
}
drawRectangle(Color.RED, food.getX(), food.getY());
}
/**
* Updates the game state.
*/
private void update() {
isMoving = false;
snake.move();
if (snake.checkCollisionWithBody(snake.getHead())) {
timeline.pause();
System.out.println("Game over!");
snake = new Snake();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
timeline.play();
}
if (snake.checkCollisionWithHead(food)) {
snake.growUp();
do {
food.generateNew(WIDTH, HEIGHT);
} while (snake.checkCollisionWithBody(food));
}
updateScreen();
}
/**
* The main method to launch the game.
*
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}