<!
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Mouse Trail</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
background-color: black;
overflow: hidden;
}
canvas {
position: fixed;
top: 0;
left: 0;
width: 100vw;
height: 100vh;
pointer-events: none;
mix-blend-mode: difference;
}
h1 {
color: white;
}
</style>
</head>
<body>
<h1>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nostrum,
corporis.</h1>
<canvas id="mouseTrail"></canvas>
<script>
const PARAMS = {
POINTS_NUMBER: 30,
WIDTH_FACTOR: 0.3,
SPRING: 0.4,
FRICTION: 0.5,
};
const OFFSET = { X: 0, Y: 0 };
const canvas = document.getElementById("mouseTrail");
const ctx = canvas.getContext("2d");
let animationFrame;
let mouseMoved = false;
const pointer = { x: window.innerWidth / 2, y: window.innerHeight / 2 };
const trail = new Array(PARAMS.POINTS_NUMBER).fill(null).map(() => ({
x: pointer.x,
y: pointer.y,
dx: 0,
dy: 0,
}));
function resizeCanvas() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
function updateMousePosition(clientX, clientY) {
pointer.x = clientX + OFFSET.X;
pointer.y = clientY + OFFSET.Y;
}
function animate(t) {
if (!mouseMoved) {
pointer.x = (0.5 + 0.3 * Math.cos((Math.random() * (0.009-0.002) +
0.002) * t) * Math.sin(0.005 * t)) * window.innerWidth + OFFSET.X;
pointer.y = (0.5 + 0.2 * Math.cos(0.005 * t) + 0.1 * Math.cos(0.01
* t)) * window.innerHeight + OFFSET.Y;
}
ctx.clearRect(0, 0, canvas.width, canvas.height);
trail.forEach((p, i) => {
const prev = i === 0 ? pointer : trail[i - 1];
const spring = i === 0 ? 0.4* PARAMS.SPRING : PARAMS.SPRING;
p.dx += (prev.x - p.x) * spring;
p.dy += (prev.y - p.y) * spring;
p.dx *= PARAMS.FRICTION;
p.dy *= PARAMS.FRICTION;
p.x += p.dx;
p.y += p.dy;
});
ctx.lineCap = "round";
ctx.beginPath();
ctx.moveTo(trail[0].x, trail[0].y);
for (let i = 1; i < trail.length - 1; i++) {
const xc = 0.5 * (trail[i].x + trail[i + 1].x);
const yc = 0.5 * (trail[i].y + trail[i + 1].y);
ctx.quadraticCurveTo(trail[i].x, trail[i].y, xc, yc);
ctx.lineWidth = PARAMS.WIDTH_FACTOR * (PARAMS.POINTS_NUMBER - i);
ctx.strokeStyle = "#ffffff";
ctx.stroke();
}
ctx.lineTo(trail[trail.length - 1].x, trail[trail.length - 1].y);
ctx.stroke();
animationFrame = requestAnimationFrame(animate);
}
function handleMouseMove(e) {
mouseMoved = true;
updateMousePosition(e.clientX, e.clientY);
}
function handleTouchMove(e) {
mouseMoved = true;
const touch = e.targetTouches[0];
updateMousePosition(touch.clientX, touch.clientY);
}
window.addEventListener("resize", resizeCanvas);
window.addEventListener("mousemove", handleMouseMove);
window.addEventListener("touchmove", handleTouchMove);
resizeCanvas();
animationFrame = requestAnimationFrame(animate);
</script>
</body>
</html>
