i was trying to write a snake game in javafx , i found this code from youtube , after running it , what i get is just a blank black scene , the snake and the food does not show on the scene , and it immediately comes to an end(game over ) i figured the game works but i cant control the snake since it is not visible. The code is the same please help
Here is the code
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
public class Main extends Application {
// variable
static int speed = 5;
static int foodcolor = 0;
static int width = 20;
static int height = 20;
static int foodX = 0;
static int foodY = 0;
static int cornersize = 25;
static List<Corner> snake = new ArrayList<>();
static Dir direction = Dir.left;
static boolean gameOver = false;
static Random rand = new Random();
public enum Dir {
left, right, up, down
}
public static class Corner {
int x;
int y;
public Corner(int x, int y) {
this.x = x;
this.y = y;
}
}
public void start(Stage primaryStage) {
try {
newFood();
VBox root = new VBox();
Canvas c = new Canvas(width * cornersize, height * cornersize);
GraphicsContext gc = c.getGraphicsContext2D();
root.getChildren().add(c);
new AnimationTimer() {
long lastTick = 0;
public void handle(long now) {
if (lastTick == 0) {
lastTick = now;
tick(gc);
return;
}
if (now - lastTick > 1000000000 / speed) {
lastTick = now;
tick(gc);
}
}
}.start();
Scene scene = new Scene(root, width * cornersize, height * cornersize);
// control
scene.addEventFilter(KeyEvent.KEY_PRESSED, key -> {
if (key.getCode() == KeyCode.W) {
direction = Dir.up;
}
if (key.getCode() == KeyCode.A) {
direction = Dir.left;
}
if (key.getCode() == KeyCode.S) {
direction = Dir.down;
}
if (key.getCode() == KeyCode.D) {
direction = Dir.right;
}
});
// add start snake parts
snake.add(new Corner(width / 2, height / 2));
snake.add(new Corner(width / 2, height / 2));
snake.add(new Corner(width / 2, height / 2));
//If you do not want to use css style, you can just delete the next line.
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setScene(scene);
primaryStage.setTitle("SNAKE GAME");
primaryStage.show();
} catch (Exception e) {
e.printStackTrace();
}
}
// tick
public static void tick(GraphicsContext gc) {
if (gameOver) {
gc.setFill(Color.RED);
gc.setFont(new Font("", 50));
gc.fillText("GAME OVER", 100, 250);
return;
}
for (int i = snake.size() - 1; i >= 1; i--) {
snake.get(i).x = snake.get(i - 1).x;
snake.get(i).y = snake.get(i - 1).y;
}
switch (direction) {
case up:
snake.get(0).y--;
if (snake.get(0).y < 0) {
gameOver = true;
}
break;
case down:
snake.get(0).y++;
if (snake.get(0).y > height) {
gameOver = true;
}
break;
case left:
snake.get(0).x--;
if (snake.get(0).x < 0) {
gameOver = true;
}
break;
case right:
snake.get(0).x++;
if (snake.get(0).x > width) {
gameOver = true;
}
break;
}
// eat food
if (foodX == snake.get(0).x && foodY == snake.get(0).y) {
snake.add(new Corner(-1, -1));
newFood();
}
// self destroy
for (int i = 1; i < snake.size(); i++) {
if (snake.get(0).x == snake.get(i).x && snake.get(0).y == snake.get(i).y) {
gameOver = true;
}
}
// fill
// background
gc.setFill(Color.BLACK);
gc.fillRect(0, 0, width * cornersize, height * cornersize);
// score
gc.setFill(Color.WHITE);
gc.setFont(new Font("", 30));
gc.fillText("Score: " + (speed - 6), 10, 30);
// random foodcolor
Color cc = Color.WHITE;
switch (foodcolor) {
case 0:
cc = Color.PURPLE;
break;
case 1:
cc = Color.LIGHTBLUE;
break;
case 2:
cc = Color.YELLOW;
break;
case 3:
cc = Color.PINK;
break;
case 4:
cc = Color.ORANGE;
break;
}
gc.setFill(cc);
gc.fillOval(foodX * cornersize, foodY * cornersize, cornersize, cornersize);
// snake
for (Corner c : snake) {
gc.setFill(Color.LIGHTGREEN);
gc.fillRect(c.x * cornersize, c.y * cornersize, cornersize - 1, cornersize - 1);
gc.setFill(Color.GREEN);
gc.fillRect(c.x * cornersize, c.y * cornersize, cornersize - 2, cornersize - 2);
}
}
// food
public static void newFood() {
start: while (true) {
foodX = rand.nextInt(width);
foodY = rand.nextInt(height);
for (Corner c : snake) {
if (c.x == foodX && c.y == foodY) {
continue start;
}
}
foodcolor = rand.nextInt(5);
speed++;
break;
}
}
public static void main(String[] args) {
launch(args);
}
}
