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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Space Invaders</title>
<style>
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
background-color: #000;
}
canvas {
border: 2px solid #fff;
}
</style>
</head>
<body>
<canvas id="gameCanvas" width="800" height="600"></canvas>
<script>
const canvas = document.getElementById('gameCanvas');
const ctx = canvas.getContext('2d');
// Game variables
let playerX = 370;
let playerY = 480;
let playerWidth = 64;
let playerHeight = 64;
let playerSpeed = 5;
let enemies = [];
const numEnemies = 6;
const enemyWidth = 64;
const enemyHeight = 64;
let bullet = {
x: 0,
y: 480,
width: 8,
height: 20,
speed: 10,
active: false
};
let score = 0;
// Initialize enemies
for (let i = 0; i < numEnemies; i++) {
enemies.push({
x: Math.random() * (canvas.width - enemyWidth),
y: Math.random() * 100 + 50,
speed: 2,
direction: 1
});
}
// Game loop
function gameLoop() {
update();
draw();
requestAnimationFrame(gameLoop);
}
function update() {
// Move player
if (keys.ArrowLeft && playerX > 0) playerX -= playerSpeed;
if (keys.ArrowRight && playerX < canvas.width - playerWidth) playerX += playerSpeed;
// Move bullet
if (bullet.active) {
bullet.y -= bullet.speed;
if (bullet.y < 0) bullet.active = false;
}
// Move enemies
enemies.forEach(enemy => {
enemy.x += enemy.speed * enemy.direction;
if (enemy.x <= 0 || enemy.x >= canvas.width - enemyWidth) {
enemy.direction *= -1;
enemy.y += 20;
}
// Check for collision with bullet
if (bullet.active && collision(bullet, enemy)) {
bullet.active = false;
enemy.y = Math.random() * 100 + 50;
enemy.x = Math.random() * (canvas.width - enemyWidth);
score++;
}
// Check for game over
if (enemy.y > playerY - enemyHeight) {
alert('Game Over! Your score: ' + score);
resetGame();
}
});
}
function draw() {
// Clear canvas
ctx.fillStyle = 'black';
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Draw player
ctx.fillStyle = 'lime';
ctx.fillRect(playerX, playerY, playerWidth, playerHeight);
// Draw enemies
ctx.fillStyle = 'red';
enemies.forEach(enemy => {
ctx.fillRect(enemy.x, enemy.y, enemyWidth, enemyHeight);
});
// Draw bullet
if (bullet.active) {
ctx.fillStyle = 'white';
ctx.fillRect(bullet.x, bullet.y, bullet.width, bullet.height);
}
// Draw score
ctx.fillStyle = 'white';
ctx.font = '24px Arial';
ctx.fillText('Score: ' + score, 10, 30);
}
function collision(rect1, rect2) {
return rect1.x < rect2.x + enemyWidth &&
rect1.x + rect1.width > rect2.x &&
rect1.y < rect2.y + enemyHeight &&
rect1.y + rect1.height > rect2.y;
}
function resetGame() {
playerX = 370;
score = 0;
enemies.forEach(enemy => {
enemy.y = Math.random() * 100 + 50;
enemy.x = Math.random() * (canvas.width - enemyWidth);
});
}
// Keyboard input
let keys = {};
document.addEventListener('keydown', (e) => {
keys[e.code] = true;
if (e.code === 'Space' && !bullet.active) {
bullet.active = true;
bullet.x = playerX + playerWidth / 2 - bullet.width / 2;
bullet.y = playerY;
}
});
document.addEventListener('keyup', (e) => {
keys[e.code] = false;
});
// Start the game
gameLoop();
</script>
</body>
</html> |