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Script

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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>Simple Platformer</title>
<style>
    body {
        margin: 0;
        overflow: hidden;
        background-color: #87CEEB;
    }
    canvas {
        display: block;
        margin: auto;
        background-color: #fff;
    }
</style>
</head>
<body>
<canvas id="gameCanvas" width="800" height="600"></canvas>
<script>
    const canvas = document.getElementById('gameCanvas');
    const ctx = canvas.getContext('2d');

    const PLAYER_SIZE = 20;
    const PLATFORM_WIDTH = 100;
    const PLATFORM_HEIGHT = 20;
    const GRAVITY = 0.5;
    const JUMP_FORCE = -10;
    const PLAYER_SPEED = 3;

    let player = {
        x: 50,
        y: 50,
        vx: 0,
        vy: 0,
        grounded: false,
        width: PLAYER_SIZE,
        height: PLAYER_SIZE,
        jumping: false
    };

    let platforms = [
        { x: 100, y: 500, width: PLATFORM_WIDTH, height: PLATFORM_HEIGHT },
        { x: 300, y: 400, width: PLATFORM_WIDTH, height: PLATFORM_HEIGHT },
        { x: 500, y: 300, width: PLATFORM_WIDTH, height: PLATFORM_HEIGHT },
        { x: 0, y: 580, width: 800, height: 20 } // Platform for the player to land on
    ];

    function drawPlayer() {
        ctx.fillStyle = '#FF0000';
        ctx.fillRect(player.x, player.y, player.width, player.height);
    }

    function drawPlatforms() {
        ctx.fillStyle = '#000000';
        platforms.forEach(platform => {
            ctx.fillRect(platform.x, platform.y, platform.width, platform.height);
        });
    }

    function applyGravity() {
        if (!player.grounded) {
            player.vy += GRAVITY;
        }
    }

    function applyVelocity() {
        player.x += player.vx;
        player.y += player.vy;
    }

    function checkCollisions() {
        platforms.forEach(platform => {
            if (
                player.x + player.width > platform.x &&
                player.x < platform.x + platform.width &&
                player.y + player.height >= platform.y && // Change here
                player.y < platform.y + platform.height
            ) {
                player.vy = 0;
                player.y = platform.y - player.height;
                player.grounded = true;
            }
        });

        // Check if player falls off the platform
        if (player.y + player.height >= canvas.height) {
            player.grounded = false;
        }
    }

    function handleInput() {
        if (keys['a']) {
            player.vx = -PLAYER_SPEED;
        } else if (keys['d']) {
            player.vx = PLAYER_SPEED;
        } else {
            player.vx = 0;
        }

        if (keys['w'] && player.grounded) {
            player.vy = JUMP_FORCE;
            player.grounded = false;
        }
    }

    let keys = {};

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

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

    function update() {
        applyGravity();
        applyVelocity();
        checkCollisions();
        handleInput();
    }

    function draw() {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        drawPlayer();
        drawPlatforms();
        requestAnimationFrame(draw);
    }

    function gameLoop() {
        update();
        draw();
    }

    setInterval(gameLoop, 1000 / 60);
</script>
</body>
</html>

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