RandomCode/Platform Game.html at main · GaMaDeCa/RandomCode · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Simple Platform Game</title>
  <style>
    body {
      margin: 0;
      overflow: hidden;
    }
    canvas {
      display: block;
      background-color: lightblue;
    }
  </style>
</head>
<body>
<canvas id="gameCanvas" width="500" height="500"></canvas>

<script>
const canvas = document.getElementById("gameCanvas");
const ctx = canvas.getContext("2d");

const GRAVITY = 0.5;
const FRICTION = 0.8;

// Key Map
let keys = {};
document.addEventListener("keydown", e => keys[e.key] = true);
document.addEventListener("keyup", e => keys[e.key] = false);

// Map and Camera
const world = {
  width: 3000,
  height: 2000
};

let camera = {
  x: 0,
  y: 0,
  width: canvas.width,
  height: canvas.height
};

// Player
const player = {
  x: 100,
  y: 100,
  width: 40,
  height: 70,
  dx: 0,
  dy: 0,
  speed: 5,
  jumpForce: -12,
  grounded: false,
  color: "black",
  collected: 0
};

// Platforms
const platforms = [
  { x: 0, y: 550, width: 3000, height: 50 }, // floor
  { x: 250, y: 450, width: 250, height: 50 }, // first tower
  { x: 275, y: 350, width: 200, height: 30 },
  { x: 300, y: 250, width: 150, height: 20 },
  { x: 325, y: 180, width: 100, height: 5 }, // top
  { x: 600, y: 450, width: 150, height: 20 },
  { x: 800, y: 350, width: 150, height: 20 },
  { x: 1000, y: 250, width: 150, height: 20 },
  { x: 1300, y: 150, width: 150, height: 20 }, // diagonal tower
  { x: 1600, y: 450, width: 150, height: 20 },
  { x: 1900, y: 350, width: 150, height: 20 },
  { x: 2200, y: 250, width: 150, height: 20 },
  { x: 2770, y: 530, width: 145, height: 20 },
  { x: 2800, y: 430, width: 70, height: 100, isDoor: true }, // final door
];

// Coins(collectable items)
let items = [
  { x: 680, y: 410, width: 20, height: 20, collected: false },
  { x: 650, y: 410, width: 20, height: 20, collected: false },
  { x: 1350, y: 110, width: 20, height: 20, collected: false },
  { x: 2250, y: 210, width: 20, height: 20, collected: false },
  { x: 320, y: 130, width: 20, height: 20, collected: false },
  { x: 350, y: 130, width: 20, height: 20, collected: false },
  { x: 380, y: 130, width: 20, height: 20, collected: false },
  { x: 410, y: 130, width: 20, height: 20, collected: false }
];

// Enemies
let enemies = [
  { x: 600, y: 430, width: 30, height: 20, dx: 1, minX: 600, maxX: 750 },
  { x: 1900, y: 330, width: 30, height: 20, dx: 1, minX: 1900, maxX: 2050 },
  { x: 500, y: 530, width: 30, height: 20, dx: 1, minX: 500, maxX: 2050 },
  { x: 500, y: 530, width: 30, height: 20, dx: 3, minX: 500, maxX: 2050 } // Fast enemy
];

// Game loop
function update() {
  // Movement
  player.dx = 0;
  if (keys["ArrowLeft"]) player.dx = -player.speed;
  if (keys["ArrowRight"]) player.dx = player.speed;
  if (keys[" "] && player.grounded) {
    player.dy = player.jumpForce;
    player.grounded = false;
  }

  // Physics
  player.dy += GRAVITY;
  player.x += player.dx;
  player.y += player.dy;

  // Platform collision
  player.grounded = false;
  for (let plat of platforms) {
    if (plat.isDoor) {
		// Rectangular collision
		if ((player.x + player.width > plat.x && player.x < plat.x + plat.width) &&
			(player.y + player.height > plat.y && player.y < plat.y + plat.height)) {
			if (player.collected >= items.length) {
				resetGame();
				alert("End Game!\nCongratulations!");
			}
		}
	} else if (
      player.x < plat.x + plat.width &&
      player.x + player.width > plat.x &&
      player.y + player.height < plat.y + 10 &&
      player.y + player.height + player.dy >= plat.y
    ) {
      player.y = plat.y - player.height;
      player.dy = 0;
      player.grounded = true;
    }
  }
  // World Bounds Collision
  if (player.x < 0)
	player.x = 0;
  else if (player.x + player.width > world.width)
	player.x = world.width - player.width;
  else if (player.y + player.height > world.height)
	resetGame();

  // Camera follows player (horizontal and vertical)
  const centerX = camera.width / 2;
  const centerY = camera.height / 2;
  if (player.x - camera.x > centerX) {
    camera.x = player.x - centerX;
  } else if (player.x - camera.x < centerX * 0.5) {
    camera.x = player.x - centerX * 0.5;
  }

  if (player.y - camera.y > centerY) {
    camera.y = player.y - centerY;
  } else if (player.y - camera.y < centerY * 0.5) {
    camera.y = player.y - centerY * 0.5;
  }

  // Camera Limits
  camera.x = Math.max(0, Math.min(camera.x, world.width - camera.width));
  camera.y = Math.max(0, Math.min(camera.y, world.height - camera.height));

  for (let item of items) {
    if (!item.collected &&
      player.x < item.x + item.width &&
      player.x + player.width > item.x &&
      player.y < item.y + item.height &&
      player.y + player.height > item.y
    ) {
      item.collected = true;
      player.collected++;
    }
  }

  // Enemies
  for (let enemy of enemies) {
    enemy.x += enemy.dx;
    if (enemy.x < enemy.minX || enemy.x + enemy.width > enemy.maxX) {
      enemy.dx *= -1;
    }

    // Enemy collision = reset
    if (
      player.x < enemy.x + enemy.width &&
      player.x + player.width > enemy.x &&
      player.y < enemy.y + enemy.height &&
      player.y + player.height > enemy.y
    ) {
	  // Died
      resetGame();
    }
  }
}

function draw() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);

  ctx.save();
  ctx.translate(-camera.x, -camera.y);

  // Platform
  for (let plat of platforms) {
    ctx.fillStyle = plat.isDoor ? "green" : "#775511";
    ctx.fillRect(plat.x, plat.y, plat.width, plat.height);
  }

  // The coins
  for (let item of items) {
    if (!item.collected) {
      ctx.fillStyle = "gold";
      ctx.fillRect(item.x, item.y, item.width, item.height);
    }
  }

  // Enemy
  for (let enemy of enemies) {
    ctx.fillStyle = "red";
    ctx.fillRect(enemy.x, enemy.y, enemy.width, enemy.height);
  }

  // Player
  ctx.fillStyle = player.color;
  ctx.fillRect(player.x, player.y, player.width, player.height);

  ctx.restore();

  // HUD
  ctx.fillStyle = "black";
  ctx.font = "20px Arial";
  ctx.fillText(`Collected items(door activation): ${player.collected}/${items.length}`, 20, 30);
}

function resetGame() {
  player.x = 100;
  player.y = 100;
  player.dx = 0;
  player.dy = 0;
  player.collected = 0;
  camera.x = 0;
  camera.y = 0;
  items.forEach(item => item.collected = false);
}

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

function resizeGame() {
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;

  camera.width = canvas.width;
  camera.height = canvas.height;
}

resizeGame();
window.addEventListener("resize", resizeGame);

gameLoop();
</script>
</body>
</html>