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Script

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<!DOCTYPE html>
<html>
<head>
<title>Shooting Game</title>
<style>
  body { margin:0; background:black; overflow:hidden; }
  canvas { display:block; }
</style>
</head>
<body>

<canvas id="canvas"></canvas>

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

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

// Player
let player = { x: 100, y: canvas.height/2, size: 30 };

// Enemy
let enemy = { x: canvas.width - 150, y: canvas.height/2, size: 30, alive: true };

// Bullets
let bullets = [];

// Controls
window.addEventListener("keydown", (e) => {
  if (e.key === "ArrowUp") player.y -= 20;
  if (e.key === "ArrowDown") player.y += 20;
  if (e.key === " ") {
    bullets.push({ x: player.x + 20, y: player.y + 10 });
  }
});

function drawPlayer() {
  ctx.fillStyle = "blue";
  ctx.fillRect(player.x, player.y, player.size, player.size);
}

function drawEnemy() {
  if (enemy.alive) {
    ctx.fillStyle = "red";
    ctx.fillRect(enemy.x, enemy.y, enemy.size, enemy.size);
  }
}

function drawBullets() {
  ctx.fillStyle = "yellow";
  bullets.forEach(b => {
    ctx.fillRect(b.x, b.y, 10, 5);
  });
}

function updateBullets() {
  bullets.forEach(b => {
    b.x += 8;

    // Collision
    if (enemy.alive &&
        b.x < enemy.x + enemy.size &&
        b.x + 10 > enemy.x &&
        b.y < enemy.y + enemy.size &&
        b.y + 5 > enemy.y) {
      enemy.alive = false;
    }
  });
}

function drawWin() {
  if (!enemy.alive) {
    ctx.fillStyle = "white";
    ctx.font = "40px Arial";
    ctx.fillText("You Win!", canvas.width/2 - 100, 100);
  }
}

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

  drawPlayer();
  drawEnemy();
  drawBullets();
  updateBullets();
  drawWin();

  requestAnimationFrame(update);
}

update();
</script>

</body>
</html>

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Performance Summary

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2KB

Transfer Size

2KB

Content Size

114.0ms

Dom Content Loaded

188.0ms

First Paint

114.0ms

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