A game in which a character is in the middle of the screen, the screen scrolls horizontally, and obstacles are flowing by jumping to avoid them.'s game

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No:949

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A game in which a character is in the middle of th..ALL
Developer User3203｜Date and time 23/6/17 23:03:20
Build time 40.685 sec｜Game capacity 3.516KB｜

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<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>ジャンプ！</title>
	<style>
		body {
			margin: 0;
			padding: 0;
		}
		canvas {
			border: 1px solid black;
		}
		#message {
			position: absolute;
			top: 50%;
			left: 50%;
			transform: translate(-50%, -50%);
			font-size: 3em;
			color: white;
			text-align: center;
			display: none;
		}
	</style>
</head>
<body>
	<canvas id="myCanvas"></canvas>
	<div id="message"></div>
	<script>
		const c = document.getElementById("myCanvas");
		const ctx = c.getContext("2d");
		const charSize = 50;
		const charJumpSpeed = 10;
		const obstacleSpeed = 5;
		const obstacleDensity = 0.003;
		const obstacleWidth = 50;
		const obstacleHeight = 100;
		let charY = c.height - charSize;
		let charJumping = false;
		let charJumpHeight = 0;
		let obstacles = [];
		let distance = 0;
		let gameOver = false;
		let score = 0;
		
		function drawChar() {
			ctx.fillStyle = "yellow";
			ctx.fillRect(c.width / 2 - charSize / 2, charY - charJumpHeight, charSize, charSize);
		}
		
		function jumpChar() {
			if (!charJumping) {
				charJumping = true;
				charJumpHeight = 1;
			}
		}
		
		function drawObstacles() {
			for (let i = 0; i < obstacles.length; i++) {
				ctx.fillStyle = "gray";
				ctx.fillRect(obstacles[i].x, obstacles[i].y, obstacleWidth, obstacleHeight);
			}
		}
		
		function moveObstacles() {
			for (let i = 0; i < obstacles.length; i++) {
				obstacles[i].x -= obstacleSpeed;
				if (obstacles[i].x + obstacleWidth < 0) {
					obstacles.splice(i, 1);
					i--;
				}
			}
		}
		
		function generateObstacle() {
			if (Math.random() < obstacleDensity) {
				const obstacleY = c.height - obstacleHeight;
				obstacles.push({x: c.width, y: obstacleY});
			}
		}
		
		function detectCollision() {
			for (let i = 0; i < obstacles.length; i++) {
				if (charY - charJumpHeight + charSize >= obstacles[i].y && charY - charJumpHeight <= obstacles[i].y + obstacleHeight) {
					if (c.width / 2 - charSize / 2 + charSize >= obstacles[i].x && c.width / 2 - charSize / 2 <= obstacles[i].x + obstacleWidth) {
						return true;
					}
				}
			}
			return false;
		}
		
		function clearCanvas() {
			ctx.clearRect(0, 0, c.width, c.height);
		}
		
		function drawDistance() {
			ctx.fillStyle = "white";
			ctx.font = "20px Arial";
			ctx.fillText("Distance: " + Math.floor(distance), 10, 30);
		}
		
		function drawScore() {
			ctx.fillStyle = "white";
			ctx.font = "20px Arial";
			ctx.fillText("Score: " + score, c.width - 110, 30);
		}
		
		function gameOverScreen() {
			ctx.fillStyle = "rgba(0, 0, 0, 0.5)";
			ctx.fillRect(0, 0, c.width, c.height);
			ctx.fillStyle = "white";
			ctx.font = "50px Arial";
			ctx.fillText("GAME OVER", c.width / 2, c.height / 2 - 25);
			ctx.font = "30px Arial";
			ctx.fillText("Score: " + score, c.width / 2, c.height / 2 + 25);
		}
		
		function gameLoop() {
			if (gameOver) {
				gameOverScreen();
				return;
			}
			clearCanvas();
			drawChar();
			drawObstacles();
			moveObstacles();
			generateObstacle();
			distance += obstacleSpeed / 10;
			if (detectCollision()) {
				gameOver = true;
			}
			score = Math.floor(distance);
			drawDistance();
			drawScore();
			if (charJumping) {
				charJumpHeight += charJumpSpeed;
				if (charJumpHeight >= charSize) {
					charJumping = false;
				}
			}
			requestAnimationFrame(gameLoop);
		}
		
		document.addEventListener("keydown", function(event) {
			if (event.keyCode == 32) { // space
				jumpChar();
			}
		});
		
		gameLoop();
	</script>
</body>
</html>