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Bratonien-Adventskalender/adventskalender/shared/js/glitter.js

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// Bratonien Glitter Hover Effekt feiner, rieselnder Staub
document.querySelectorAll(".door").forEach(door => {
let canvas, ctx, particles = [], anim, hovering = false;
// Canvas vorbereiten
function setupCanvas() {
if (canvas) return;
canvas = document.createElement("canvas");
canvas.width = door.offsetWidth * 1.4;
canvas.height = door.offsetHeight * 1.4;
canvas.style.position = "absolute";
canvas.style.top = "-20%";
canvas.style.left = "-20%";
canvas.style.pointerEvents = "none";
canvas.style.zIndex = "10";
door.appendChild(canvas);
ctx = canvas.getContext("2d");
}
// Neue Partikel erzeugen (feiner, sanfter)
function addParticles() {
for (let i = 0; i < 3; i++) {
particles.push({
x: Math.random() * canvas.width,
y: -5, // startet oben, rieselt nach unten
r: Math.random() * 0.8 + 0.2,
alpha: Math.random() * 0.6 + 0.3,
vx: (Math.random() - 0.5) * 0.2, // leichtes Driften
vy: Math.random() * 0.6 + 0.3, // nach unten
life: Math.random() * 200 + 80
});
}
}
// Zeichnen und Bewegung
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (hovering) addParticles();
particles.forEach(p => {
ctx.beginPath();
const grad = ctx.createRadialGradient(p.x, p.y, 0, p.x, p.y, p.r * 3);
grad.addColorStop(0, `rgba(255, 235, 160, ${p.alpha})`);
grad.addColorStop(0.3, `rgba(255, 220, 120, ${p.alpha * 0.8})`);
grad.addColorStop(1, "transparent");
ctx.fillStyle = grad;
ctx.arc(p.x, p.y, p.r * 3, 0, Math.PI * 2);
ctx.fill();
// Bewegung feines Rieseln
p.x += p.vx;
p.y += p.vy;
p.alpha -= 0.002;
p.life--;
});
particles = particles.filter(p => p.life > 0 && p.y < canvas.height && p.alpha > 0);
anim = requestAnimationFrame(draw);
}
// Hover starten
door.addEventListener("mouseenter", () => {
setupCanvas();
hovering = true;
cancelAnimationFrame(anim);
draw();
});
// Hover beenden
door.addEventListener("mouseleave", () => {
hovering = false;
setTimeout(() => {
if (!hovering) {
cancelAnimationFrame(anim);
particles = [];
ctx.clearRect(0, 0, canvas.width, canvas.height);
}
}, 300);
});
});