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Commit e62ccaae authored by amrib's avatar amrib
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Added movement, and increming snake length upon consumption of food, and game end on walls and self

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with 144 additions and 70 deletions
SnakeGame.java
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View file @ e62ccaae
// Objective: Implent a snake game in java
import java.util.Random;
import java.util.Scanner;
public class SnakeGame {
// Constants declared
public static final int GRID_SIZE_X = 20; // Width of row
public static final int GRID_SIZE_Y = 10; // Height of column
public static final int MAX_SNAKE_LENGTH = 100;
public static final char SNAKE_CHAR = 'S'; // Snake on the grid
public static final char FOOD_CHAR = '@'; // FOod on the grid
public static final char FOOD_CHAR = '@'; // Food on the grid
public static final char EMPTY_CHAR = '.'; // Empty space of the grid
public static final char WALL_CHAR = '#'; // Wall of the grid
// Variables declared
public static char[][] grid; // The game space grid
public static int snakeLength; // Current snake length tracker
public static int snake[][]; // Body of snake
public static int[][] snake; // Body of snake
public static int foodX, foodY; // Position of food
public static char direction = 'd'; // Current direction of the snake
public static boolean isGameOver = false; // Game over flag
// Initialize the grid
public static void initializeGame() {
grid = new char[GRID_SIZE_Y][GRID_SIZE_X];
Random random = new Random();
......@@ -27,9 +29,9 @@ public static void initializeGame() {
for (int y = 0; y < GRID_SIZE_Y; y++) {
for (int x = 0; x < GRID_SIZE_X; x++) {
if (y == 0 || y == GRID_SIZE_Y - 1 || x == 0 || x == GRID_SIZE_X - 1) {
grid[y][x] = WALL_CHAR; // create walls
grid[y][x] = WALL_CHAR; // Create walls
} else {
grid[y][x] = EMPTY_CHAR; // create empty space
grid[y][x] = EMPTY_CHAR; // Create empty space
}
}
}
......@@ -37,41 +39,97 @@ public static void initializeGame() {
generateFood(); // Generation of Food
// Initialize the snake
int snakeLength = 3;
snakeLength = 3;
snake = new int[MAX_SNAKE_LENGTH][2]; // Space for snake
int startX = 0, startY = 0;
int startX, startY;
// Generate a valid random coordinate start
do {
// Randomized position of snake within valid grid boundaries (not walls)
startX = random.nextInt(GRID_SIZE_X - 2) + 1; // Random value between 1 and GRID_SIZE_X-2
startY = random.nextInt(GRID_SIZE_Y - 2) + 1; // Random value between 1 and GRID_SIZE_Y-2
} while (grid[startY][startX] != EMPTY_CHAR); // Loop runs until an empty space is found
// Place the snake on the grid
for (int i = 0; i < snakeLength; i++) {
snake[i][0] = startY + i; // Y-coordinate of the snake segment
snake[i][1] = startX; // X-coordinate of the snake segment
if (i==0) {
grid[snake[i][0]][snake[i][1]] = SNAKE_CHAR; // Add the snake head
}
snake[i][0] = startY; // Y-coordinate of the snake segment
snake[i][1] = startX - i; // X-coordinate of the snake segment
grid[snake[i][0]][snake[i][1]] = SNAKE_CHAR; // Place snake on the grid
}
}
// Generate food at a random location
public static void generateFood() {
Random rand = new Random();
int foodPosX = rand.nextInt(19) + 1; // X-coordinate (1-19)
int foodPosY = rand.nextInt(9) + 1; // Y-coordinate (1-9)
do {
foodX = rand.nextInt(GRID_SIZE_X - 2) + 1; // X-coordinate (1-18)
foodY = rand.nextInt(GRID_SIZE_Y - 2) + 1; // Y-coordinate (1-8)
} while (grid[foodY][foodX] != EMPTY_CHAR); // Ensure food is not placed on the snake
grid[foodY][foodX] = FOOD_CHAR; // Place food on the grid
}
// Update the snake's position and check for collisions
public static void moveSnake(char direction) {
// Calculate new head position
int newHeadX = snake[0][1];
int newHeadY = snake[0][0];
switch (direction) {
case 'w': newHeadY--; break; // Move up
case 's': newHeadY++; break; // Move down
case 'a': newHeadX--; break; // Move left
case 'd': newHeadX++; break; // Move right
}
// Check for collision with walls or self
if (!isValidMove(newHeadX, newHeadY)) {
isGameOver = true;
return;
}
if (grid[foodPosY][foodPosX] == EMPTY_CHAR) { // Check if the position is empty
grid[foodPosY][foodPosX] = FOOD_CHAR; // Add food to grid
// Check if the snake has eaten the food
if (newHeadX == foodX && newHeadY == foodY) {
// Grow the snake
snakeLength++;
generateFood(); // Place new food
} else {
generateFood(); // New coordinates if position in snake
// Clear the tail from the grid
int tailX = snake[snakeLength - 1][1];
int tailY = snake[snakeLength - 1][0];
grid[tailY][tailX] = EMPTY_CHAR;
}
// Move the snake's body
for (int i = snakeLength - 1; i > 0; i--) {
snake[i][0] = snake[i - 1][0];
snake[i][1] = snake[i - 1][1];
}
// Update the snake's head position
snake[0][0] = newHeadY;
snake[0][1] = newHeadX;
// Place the new head on the grid
grid[newHeadY][newHeadX] = SNAKE_CHAR;
}
// Check if the move is valid (i.e., within boundaries and not hitting itself)
public static boolean isValidMove(int x, int y) {
// Check if the new position is outside the grid or on the wall
if (grid[y][x] == WALL_CHAR) {
return false;
}
// Check if the new position collides with itself
for (int i = 0; i < snakeLength; i++) {
if (snake[i][0] == y && snake[i][1] == x) {
return false;
}
}
return true;
}
// Display the grid
public static void displayGrid() {
for (int y = 0; y < GRID_SIZE_Y; y++) {
for (int x = 0; x < GRID_SIZE_X; x++) {
......@@ -81,15 +139,31 @@ public static void displayGrid() {
}
}
// Main game loop
public static void main(String[] args) {
initializeGame();
displayGrid();
}
Scanner scanner = new Scanner(System.in);
while (!isGameOver) {
char direction = ' ';
boolean validInput = false;
while (!validInput) {
System.out.println("Enter a direction ('w', 'a', 's', 'd'): ");
direction = scanner.next().charAt(0);
if (direction == 'w' || direction == 's' || direction == 'a' || direction == 'd') {
validInput = true;
} else {
System.out.println("Invalid input. Please enter 'w', 's', 'a', or 'd'.");
}
}
moveSnake(direction);
displayGrid();
} // End of game loop
scanner.close();
}
}
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