javascript_course/index.html at main · TomLinthwaite/javascript_course · GitHub

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<html>
	<head>
		<style>
			body {
				font-family: Arial, sans-serif;
				margin: 2em;
				background-color: #dcebff;
			}
			.player {
				font-family: monospace;
				white-space: pre;
				position: absolute;
				font-weight: 900;
				width: 100px;
				height: 20px;
				background-color: #333;
				border-radius: 20%;
			}
			.player-stats {
				position: fixed;
				top: 10px;
				left: 10px;
				width: 150px;
				background-color: rgba(255, 255, 255, 0.8);
				padding: 10px;
				border-radius: 5px;
				box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
				font-size: 18px;
				z-index: 1000;
			}
			.player-stats div {
				display: flex;
				justify-content: space-between;
				padding: 5px;
			}
		</style>
		<script>
			let gameTimer = setInterval(gameLoop, 1000 / 60);
			let movementSpeed = 10;
			let bullets = [];
			let enemies = [];
			let powerUps = [];
			let score = 0;

			function updateScore(points) {
				score += points;
				document.getElementById("scoreLabel").innerText = score;
			}

			function updateSpeed(amount) {
				movementSpeed += amount;
				document.getElementById("movementSpeedLabel").innerText = movementSpeed;
			}

			function createEnemy() {
				let enemy = document.createElement("div");
				enemy.style.position = "absolute";
				enemy.style.width = "50px";
				enemy.style.height = "50px";
				enemy.style.backgroundColor = "orange";
				enemy.style.borderRadius = "20%";
				enemy.style.top = "0px";
				enemy.style.left = Math.floor(Math.random() * (window.innerWidth - 50)) + "px";
				document.body.appendChild(enemy);
				enemies.push(enemy);
			}

			function createPowerUp() {
				let powerUp = document.createElement("div");
				powerUp.style.position = "absolute";
				powerUp.style.width = "15px";
				powerUp.style.height = "15px";
				powerUp.style.backgroundColor = "green";
				powerUp.style.borderRadius = "50%";
				powerUp.style.top = "0px";
				powerUp.style.left = Math.floor(Math.random() * (window.innerWidth - 30)) + "px";
				document.body.appendChild(powerUp);
				powerUps.push(powerUp);
			}

			function gameLoop() {
				// Handle bullets
				for (let i = 0; i < bullets.length; i++) {
					let bullet = bullets[i];
					let top = parseInt(bullet.style.top);
					if (top <= 0) {
						document.body.removeChild(bullet);
						bullets.splice(i, 1);
						i--;
					} else {
						bullet.style.top = (top - 15) + "px";

						// Check for collisions with enemies
						for (let j = 0; j < enemies.length; j++) {
							let enemy = enemies[j];
							let enemyRect = enemy.getBoundingClientRect();
							let bulletRect = bullet.getBoundingClientRect();
							if (!(bulletRect.right < enemyRect.left ||
									bulletRect.left > enemyRect.right ||
									bulletRect.bottom < enemyRect.top ||
									bulletRect.top > enemyRect.bottom)) {
								// Collision detected
								document.body.removeChild(enemy);
								enemies.splice(j, 1);
								j--;
								document.body.removeChild(bullet);
								bullets.splice(i, 1);
								i--;
								updateScore(10);
								break;
							}
						}
					}
				}

				// Randomly create enemies
				if (Math.random() < 0.02) {
					createEnemy();
				}

				// Handle enemies
				for (let i = 0; i < enemies.length; i++) {
					let enemy = enemies[i];
					let top = parseInt(enemy.style.top);
					if (top >= window.innerHeight) {
						document.body.removeChild(enemy);
						enemies.splice(i, 1);
						i--;
					} else {
						enemy.style.top = (top + 5) + "px";

						// Checl for collisions with player
						let player = document.getElementById("player");
						let playerRect = player.getBoundingClientRect();
						let enemyRect = enemy.getBoundingClientRect();
						if (!(enemyRect.right < playerRect.left ||
								enemyRect.left > playerRect.right ||
								enemyRect.bottom < playerRect.top ||
								enemyRect.top > playerRect.bottom)) {
							// Collision detected
							document.body.removeChild(enemy);
							enemies.splice(i, 1);
							i--;
							updateSpeed(-5);
							updateScore(-20);
						}
					}
				}

				// Handle power-ups
				if (Math.random() < 0.005) {
					createPowerUp();
				}

				for (let i = 0; i < powerUps.length; i++) {
					let powerUp = powerUps[i];
					let top = parseInt(powerUp.style.top);
					if (top >= window.innerHeight) {
						document.body.removeChild(powerUp);
						powerUps.splice(i, 1);
						i--;
					} else {
						powerUp.style.top = (top + 3) + "px";

						// Check for collisions with player and increase movement speed
						let player = document.getElementById("player");
						let playerRect = player.getBoundingClientRect();
						let powerUpRect = powerUp.getBoundingClientRect();
						if (!(powerUpRect.right < playerRect.left ||
								powerUpRect.left > playerRect.right ||
								powerUpRect.bottom < playerRect.top ||
								powerUpRect.top > playerRect.bottom)) {
							// Collision detected
							document.body.removeChild(powerUp);
							powerUps.splice(i, 1);
							i--;
							updateSpeed(5);
						}
					}
				}
			}

			function fireBullet() {
				let bullet = document.createElement("div");
				bullet.style.position = "absolute";
				bullet.style.width = "10px";
				bullet.style.height = "10px";
				bullet.style.borderRadius = "50%";
				bullet.style.backgroundColor = "#333";

				let player = document.getElementById("player");
				let playerLeft = parseInt(player.style.left);
				let playerTop = parseInt(player.style.top);

				bullet.style.left = (playerLeft + 47.5) + "px";
				bullet.style.top = (playerTop - 10) + "px";

				document.body.appendChild(bullet);
				bullets.push(bullet);
			}

			function gameInput() {
				if (event.key === "ArrowLeft") {
					let player = document.getElementById("player");
					let left = parseInt(player.style.left);
					if (left >= 0) {
						player.style.left = (left - movementSpeed) + "px";
					}
				}

				if (event.key === "ArrowRight") {
					let player = document.getElementById("player");
					let left = parseInt(player.style.left);
					if (left <= window.innerWidth - 50) {
						player.style.left = (left + movementSpeed) + "px";
					}
				}

				if (event.code === "Space") {
					fireBullet();
				}
			}
		</script>
	</head>
	<body onkeydown="gameInput()">
		<div class="player-stats">
			<div>
				Score: <span id="scoreLabel">0</span>
			</div>
			<div>
				Speed: <span id="movementSpeedLabel">10</span>
			</div>
		</div>
		<div id="player" class="player" style="top: 1000; left: 0px;"></div>
	</body>
</html>