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const canvas = document.getElementById('gameCanvas');
const ctx = canvas.getContext('2d');
// Menetapkan ukuran canvas
canvas.width = 800;
canvas.height = 600;
let spaceship;
let bullets = [];
let enemies = [];
let gameOver = false;
// Fungsi untuk memulai ulang game
function startGame() {
spaceship = new Spaceship();
bullets = [];
enemies = [];
gameOver = false;
document.getElementById('gameOver').style.display = 'none';
gameLoop();
}
// Membuat objek pesawat
class Spaceship {
constructor() {
this.width = 50;
this.height = 50;
this.x = canvas.width / 2 - this.width / 2;
this.y = canvas.height - this.height - 10;
this.speed = 5;
this.image = new Image();
this.image.src = 'https://via.placeholder.com/50/00ff99/000000?text=%E2%9C%94'; // Gambar pesawat
}
move(direction) {
if (direction === 'left' && this.x > 0) {
this.x -= this.speed;
} else if (direction === 'right' && this.x + this.width < canvas.width) {
this.x += this.speed;
}
}
draw() {
ctx.drawImage(this.image, this.x, this.y, this.width, this.height);
}
shoot() {
const bullet = new Bullet(this.x + this.width / 2 - 5, this.y);
bullets.push(bullet);
}
}
// Membuat objek peluru
class Bullet {
constructor(x, y) {
this.x = x;
this.y = y;
this.width = 10;
this.height = 20;
this.speed = 5;
}
move() {
this.y -= this.speed;
}
draw() {
ctx.fillStyle = '#00ff99';
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
// Membuat objek musuh
class Enemy {
constructor() {
this.width = 50;
this.height = 50;
this.x = Math.random() * (canvas.width - this.width);
this.y = -50;
this.speed = 2;
}
move() {
this.y += this.speed;
}
draw() {
ctx.fillStyle = '#ff4444';
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
// Fungsi utama untuk menggambar dan mengupdate game setiap frame
function gameLoop() {
if (gameOver) {
document.getElementById('gameOver').style.display = 'block';
return;
}
ctx.clearRect(0, 0, canvas.width, canvas.height); // Bersihkan layar
spaceship.draw();
// Gerakkan dan gambar peluru
bullets.forEach((bullet, index) => {
bullet.move();
bullet.draw();
if (bullet.y < 0) {
bullets.splice(index, 1);
}
});
// Menambahkan musuh baru secara acak
if (Math.random() < 0.02) {
enemies.push(new Enemy());
}
// Gerakkan dan gambar musuh
enemies.forEach((enemy, index) => {
enemy.move();
enemy.draw();
if (enemy.y > canvas.height) {
enemies.splice(index, 1);
}
// Cek tabrakan antara peluru dan musuh
bullets.forEach((bullet, bulletIndex) => {
if (
bullet.x < enemy.x + enemy.width &&
bullet.x + bullet.width > enemy.x &&
bullet.y < enemy.y + enemy.height &&
bullet.y + bullet.height > enemy.y
) {
enemies.splice(index, 1);
bullets.splice(bulletIndex, 1);
}
});
});
requestAnimationFrame(gameLoop); // Loop permainan |