CloudInvaders/js/game.js

const $ = (s) => document.querySelector(s);

const ROOT = $('#root');
const LIVES_LABEL = $('#lives');
const SOUND_BUTTON = $('#sound');
const CANVAS = $('#canvas');
const CTX = CANVAS.getContext('2d');


const X_BOUND = 0.05;
const GAME_OVER_BOUND = 0.9;
const MAX_RAINDROPS = 100;

const clouds = new Set();
const bullets = new Set();
const raindrops = new Set();
let shootingPad = new ShootingPad();
let running = false;
let direction = 1;
let soundEnabled = localStorage.soundEnabled !== 'false';

const initCloudField = () => {
    for (let y = 0; y < 6; y++) {
        for (let x = 0; x < 11; x++) {
            const cloud = new Cloud(X_BOUND + 0.06 * x, 0.04 + 0.06 * y, 0.03, 0.02);
            clouds.add(cloud);
        }
    }
}

const initRainEffect = () => {
    noise.seed(Math.random());
    for (let i = 0; i < MAX_RAINDROPS; i++) {
        const raindrop = new BackgroundRaindrop(
            randRange(-0.5, 1.5),
            randRange(-1, -0.1),
            randRange(0.01, 0.03),
        );

        raindrops.add(raindrop);
    }
}

const updateSoundButton = () => {
    SOUND_BUTTON.textContent = soundEnabled ? '🔊' : '🔈';
    SOUND_BUTTON.title = `Sound ${soundEnabled ? 'enabled' : 'disabled'}`;
}

const start = () => {
    $('.result')?.remove();

    shootingPad?.destroy();
    shootingPad = new ShootingPad();

    bullets.forEach(c => c.destroy());
    bullets.clear();

    clouds.forEach(c => c.destroy());
    clouds.clear();
    Cloud.reset();
    initCloudField();

    running = true;
}

const gameOver = (result) => {
    const resultLabel = document.createElement('div');
    resultLabel.className = 'result';
    resultLabel.textContent = result;
    ROOT.appendChild(resultLabel);
    running = false;
}

const loop = () => {
    document.title = `${fps()} FPS | CloudInvaders | OLC Codejam 2022`;
    CTX.clearRect(0, 0, CANVAS.width, CANVAS.height);

    raindrops.forEach(d => {
        d.update();
        d.draw();
    });
    if (running) {
        let directionUpdated = false;
        let isOver = false;
        Array.from(clouds).forEach(c => {
            c.update(direction);
            c.draw();
            if (c.x < X_BOUND || c.x > 1 - X_BOUND) {
                directionUpdated = true;
            }
            if (c.y >= GAME_OVER_BOUND) {
                isOver = true;
            }
            if (!c.alive) {
                clouds.delete(c);
            }
        });

        if (directionUpdated) {
            direction = -direction;
        }

        if (isOver) {
            gameOver('Game over');
        }

        Array.from(bullets).forEach(b => {
            b.update();
            b.draw();

            if (!b.alive) {
                bullets.delete(b);
            }
        });

        shootingPad.update();
        shootingPad.draw();

        if (clouds.size === 0) {
            gameOver('WIN');
        }
    }
    requestAnimationFrame(loop);
};

SOUND_BUTTON.addEventListener('click', () => {
    soundEnabled = !soundEnabled;
    localStorage.soundEnabled = soundEnabled;
    updateSoundButton();
});

document.addEventListener('keypress', () => {
    if (!running) {
        start();
    }
});

initRainEffect();
updateSoundButton();
loop();
start();