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HTML

CSS

JS

const canvas = document.getElementById('gameCanvas');
const ctx = canvas.getContext('2d');

const GAME_SPEED = 5; // Pixels per frame
const keys = ['ArrowLeft', 'ArrowDown', 'ArrowUp', 'ArrowRight'];

// Array to hold the scrolling notes
let notes = [];
let score = 0;

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

// Update and draw notes
    handleNotes();

requestAnimationFrame(update);
}

// Start the loop
update();
class Note {
    constructor(directionIndex) {
        this.dir = directionIndex; // 0: Left, 1: Down, 2: Up, 3: Right
        this.x = 200 + (this.dir * 100); // Layout spacing
        this.y = -50; // Start above canvas
        this.radius = 40;
    }

draw() {
        ctx.beginPath();
        ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2);
        ctx.fillStyle = ['red', 'purple', 'green', 'blue'][this.dir];
        ctx.fill();
        ctx.closePath();
    }

move() {
        this.y += GAME_SPEED;
    }
}

function handleNotes() {
    for (let i = notes.length - 1; i >= 0; i--) {
        notes[i].move();
        notes[i].draw();

// Remove notes that go off screen
        if (notes[i].y > canvas.height) {
            notes.splice(i, 1);
        }
    }
}
const HIT_Y = 600; // The target receptors area
const HIT_TOLERANCE = 50; // Pixels of leeway

window.addEventListener('keydown', (e) => {
    const index = keys.indexOf(e.key);
    if (index !== -1) {
        // Check if any note is in the hit zone for the pressed key
        for (let i = 0; i < notes.length; i++) {
            const note = notes[i];
            if (note.dir === index) {
                const distance = Math.abs(note.y - HIT_Y);
                if (distance < HIT_TOLERANCE) {
                    score += 100; // Hit!
                    notes.splice(i, 1); // Remove note
                    break;
                }
            }
        }
    }
});