axe/space_invaders.html at main · SRSWTI/axe · GitHub

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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 {
            margin: 0;
            padding: 0;
            background-color: #000;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            font-family: 'Courier New', monospace;
        }

        #gameContainer {
            text-align: center;
        }

        canvas {
            border: 2px solid #0f0;
            display: block;
            margin: 0 auto;
            background-color: #000;
        }

        #score {
            color: #0f0;
            font-size: 20px;
            margin-bottom: 10px;
        }

        #gameOver {
            color: #f00;
            font-size: 24px;
            margin-top: 20px;
            display: none;
        }

        #instructions {
            color: #0f0;
            font-size: 14px;
            margin-top: 10px;
        }
    </style>
</head>
<body>
    <div id="gameContainer">
        <div id="score">Score: 0</div>
        <canvas id="gameCanvas" width="800" height="600"></canvas>
        <div id="gameOver">GAME OVER<br>Press R to Restart</div>
        <div id="instructions">Use ← → Arrow Keys to Move, SPACE to Shoot</div>
    </div>

    <script>
        const canvas = document.getElementById('gameCanvas');
        const ctx = canvas.getContext('2d');
        const scoreElement = document.getElementById('score');
        const gameOverElement = document.getElementById('gameOver');

        // Game state
        let score = 0;
        let gameRunning = true;
        let animationId;

        // Player
        const player = {
            x: canvas.width / 2 - 25,
            y: canvas.height - 60,
            width: 50,
            height: 30,
            speed: 5
        };

        // Bullets
        const bullets = [];
        const bulletSpeed = 10;
        const bulletWidth = 4;
        const bulletHeight = 10;

        // Enemies
        const enemies = [];
        const enemyRows = 5;
        const enemyCols = 11;
        const enemyWidth = 40;
        const enemyHeight = 30;
        const enemyPadding = 10;
        const enemyOffsetTop = 60;
        const enemyOffsetLeft = 70;
        let enemyDirection = 1;
        let enemySpeed = 0.5;
        let enemyDropDistance = 30;

        // Enemy bullets
        const enemyBullets = [];
        const enemyBulletSpeed = 4;
        let lastEnemyBulletTime = 0;
        const enemyBulletInterval = 1000; // milliseconds

        // Input handling
        const keys = {};
        let lastShootTime = 0;
        const shootCooldown = 300; // milliseconds

        // Initialize enemies
        function initEnemies() {
            for (let row = 0; row < enemyRows; row++) {
                for (let col = 0; col < enemyCols; col++) {
                    enemies.push({
                        x: col * (enemyWidth + enemyPadding) + enemyOffsetLeft,
                        y: row * (enemyHeight + enemyPadding) + enemyOffsetTop,
                        width: enemyWidth,
                        height: enemyHeight,
                        alive: true,
                        points: (5 - row) * 10 // Different points for different rows
                    });
                }
            }
        }

        // Handle keyboard input
        document.addEventListener('keydown', (e) => {
            keys[e.key] = true;

            if (e.key === 'r' || e.key === 'R') {
                if (!gameRunning) {
                    restartGame();
                }
            }
        });

        document.addEventListener('keyup', (e) => {
            keys[e.key] = false;
        });

        // Update player position
        function updatePlayer() {
            if (keys['ArrowLeft'] && player.x > 0) {
                player.x -= player.speed;
            }
            if (keys['ArrowRight'] && player.x < canvas.width - player.width) {
                player.x += player.speed;
            }

            const currentTime = Date.now();
            if (keys[' '] && currentTime - lastShootTime > shootCooldown) {
                shootBullet();
                lastShootTime = currentTime;
            }
        }

        // Shoot bullet
        function shootBullet() {
            bullets.push({
                x: player.x + player.width / 2 - bulletWidth / 2,
                y: player.y,
                width: bulletWidth,
                height: bulletHeight,
                speed: bulletSpeed
            });
        }

        // Update bullets
        function updateBullets() {
            for (let i = bullets.length - 1; i >= 0; i--) {
                bullets[i].y -= bullets[i].speed;

                // Remove bullet if it goes off screen
                if (bullets[i].y < 0) {
                    bullets.splice(i, 1);
                }
            }
        }

        // Update enemies
        function updateEnemies() {
            let shouldDrop = false;
            let leftMost = canvas.width;
            let rightMost = 0;

            for (let enemy of enemies) {
                if (enemy.alive) {
                    enemy.x += enemySpeed * enemyDirection;

                    leftMost = Math.min(leftMost, enemy.x);
                    rightMost = Math.max(rightMost, enemy.x + enemy.width);

                    // Check if enemy reached player level
                    if (enemy.y + enemy.height >= player.y) {
                        gameOver();
                        return;
                    }
                }
            }

            // Check if enemies hit boundaries
            if (leftMost <= 0 || rightMost >= canvas.width) {
                enemyDirection *= -1;
                shouldDrop = true;
            }

            // Drop enemies down
            if (shouldDrop) {
                for (let enemy of enemies) {
                    enemy.y += enemyDropDistance;
                }
            }
        }

        // Enemy shooting
        function updateEnemyBullets() {
            const currentTime = Date.now();

            // Random enemy shoots occasionally
            if (currentTime - lastEnemyBulletTime > enemyBulletInterval) {
                const aliveEnemies = enemies.filter(e => e.alive);
                if (aliveEnemies.length > 0) {
                    const shooter = aliveEnemies[Math.floor(Math.random() * aliveEnemies.length)];
                    enemyBullets.push({
                        x: shooter.x + shooter.width / 2 - 2,
                        y: shooter.y + shooter.height,
                        width: 4,
                        height: 10,
                        speed: enemyBulletSpeed
                    });
                    lastEnemyBulletTime = currentTime;
                }
            }

            // Update existing enemy bullets
            for (let i = enemyBullets.length - 1; i >= 0; i--) {
                enemyBullets[i].y += enemyBullets[i].speed;

                // Check collision with player
                if (checkCollision(enemyBullets[i], player)) {
                    gameOver();
                    enemyBullets.splice(i, 1);
                    return;
                }

                // Remove bullet if it goes off screen
                if (enemyBullets[i].y > canvas.height) {
                    enemyBullets.splice(i, 1);
                }
            }
        }

        // Check collision between two rectangles
        function checkCollision(rect1, rect2) {
            return rect1.x < rect2.x + rect2.width &&
                   rect1.x + rect1.width > rect2.x &&
                   rect1.y < rect2.y + rect2.height &&
                   rect1.y + rect1.height > rect2.y;
        }

        // Check collisions
        function checkCollisions() {
            // Check player bullets vs enemies
            for (let i = bullets.length - 1; i >= 0; i--) {
                for (let j = enemies.length - 1; j >= 0; j--) {
                    if (enemies[j].alive && checkCollision(bullets[i], enemies[j])) {
                        enemies[j].alive = false;
                        bullets.splice(i, 1);
                        score += enemies[j].points;
                        updateScore();
                        break;
                    }
                }
            }

            // Check if all enemies are dead
            if (enemies.every(e => !e.alive)) {
                victory();
            }
        }

        // Update score display
        function updateScore() {
            scoreElement.textContent = `Score: ${score}`;
        }

        // Game over
        function gameOver() {
            gameRunning = false;
            gameOverElement.style.display = 'block';
            cancelAnimationFrame(animationId);
        }

        // Victory
        function victory() {
            gameRunning = false;
            gameOverElement.innerHTML = `VICTORY!<br>Final Score: ${score}<br>Press R to Play Again`;
            gameOverElement.style.color = '#0f0';
            gameOverElement.style.display = 'block';
            cancelAnimationFrame(animationId);
        }

        // Restart game
        function restartGame() {
            score = 0;
            updateScore();
            gameOverElement.style.display = 'none';
            gameOverElement.style.color = '#f00';
            gameRunning = true;

            // Reset player
            player.x = canvas.width / 2 - 25;

            // Clear arrays
            bullets.length = 0;
            enemyBullets.length = 0;
            enemies.length = 0;

            // Reinitialize
            initEnemies();

            // Start game loop
            gameLoop();
        }

        // Draw functions
        function drawPlayer() {
            ctx.fillStyle = '#0f0';
            ctx.beginPath();
            ctx.moveTo(player.x + player.width / 2, player.y);
            ctx.lineTo(player.x, player.y + player.height);
            ctx.lineTo(player.x + player.width, player.y + player.height);
            ctx.closePath();
            ctx.fill();
        }

        function drawBullets() {
            ctx.fillStyle = '#0f0';
            for (let bullet of bullets) {
                ctx.fillRect(bullet.x, bullet.y, bullet.width, bullet.height);
            }
        }

        function drawEnemies() {
            for (let enemy of enemies) {
                if (enemy.alive) {
                    // Different colors for different rows
                    const colors = ['#f00', '#f80', '#ff0', '#0f0', '#0ff'];
                    ctx.fillStyle = colors[Math.floor((enemy.y - enemyOffsetTop) / (enemyHeight + enemyPadding))] || '#f00';

                    // Draw enemy as rectangle
                    ctx.fillRect(enemy.x, enemy.y, enemy.width, enemy.height);

                    // Add some detail
                    ctx.fillStyle = '#000';
                    ctx.fillRect(enemy.x + 5, enemy.y + 5, 10, 10);
                    ctx.fillRect(enemy.x + 25, enemy.y + 5, 10, 10);
                }
            }
        }

        function drawEnemyBullets() {
            ctx.fillStyle = '#f00';
            for (let bullet of enemyBullets) {
                ctx.fillRect(bullet.x, bullet.y, bullet.width, bullet.height);
            }
        }

        // Game loop
        function gameLoop() {
            if (!gameRunning) return;

            // Clear canvas
            ctx.fillStyle = '#000';
            ctx.fillRect(0, 0, canvas.width, canvas.height);

            // Draw stars for background
            ctx.fillStyle = '#fff';
            for (let i = 0; i < 20; i++) {
                const x = (i * 73) % canvas.width;
                const y = (i * 37) % canvas.height;
                ctx.fillRect(x, y, 1, 1);
            }

            // Update game objects
            updatePlayer();
            updateBullets();
            updateEnemies();
            updateEnemyBullets();
            checkCollisions();

            // Draw game objects
            drawEnemies();
            drawBullets();
            drawEnemyBullets();
            drawPlayer();

            // Continue loop
            animationId = requestAnimationFrame(gameLoop);
        }

        // Initialize and start game
        initEnemies();
        gameLoop();
    </script>
</body>
</html>