자바스크립트를 사용하여 마우스를 따라 선이 생기는 효과를 만들어 볼 수 있습니다.
HTML 소스
<canvas></canvas>
CSS 소스
body, html {
padding: 0;
margin: 0;
}
JS 소스
const canvas = document.querySelector("canvas");
const ctx = canvas.getContext('2d');
// for intro motion
let mouseMoved = false;
let mouse = {
x: .5 * window.innerWidth,
y: .5 * window.innerHeight,
tX: 0,
tY: 0
}
let params = {
pointsNumber: 40,
widthFactor: .3,
mouseThreshold: .6,
spring: .4,
friction: .5
};
const touchTrail = new Array(params.pointsNumber);
for (let i = 0; i < params.pointsNumber; i++) {
touchTrail[i] = {
x: mouse.x,
y: mouse.y,
vx: 0,
vy: 0,
}
}
window.addEventListener("click", e => {
updateMousePosition(e.pageX, e.pageY);
});
window.addEventListener("mousemove", e => {
mouseMoved = true;
updateMousePosition(e.pageX, e.pageY);
});
window.addEventListener("touchmove", e => {
mouseMoved = true;
updateMousePosition(e.targetTouches[0].pageX, e.targetTouches[0].pageY);
});
function updateMousePosition(eX, eY) {
mouse.tX = eX;
mouse.tY = eY;
}
setupCanvas();
updateBubbles(0);
window.addEventListener('resize', () => {
setupCanvas();
});
function updateBubbles(t) {
// for intro motion
if (!mouseMoved) {
mouse.tX = (.5 + .3 * Math.cos(.002 * t) * (Math.sin(.005 * t))) * window.innerWidth;
mouse.tY = (.5 + .2 * (Math.cos(.005 * t)) + .1 * Math.cos(.01 * t)) * window.innerHeight;
}
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.beginPath();
touchTrail.forEach((p, pIdx) => {
if (pIdx === 0) {
p.x = mouse.x;
p.y = mouse.y;
ctx.moveTo(p.x, p.y);
} else {
p.vx += (touchTrail[pIdx - 1].x - p.x) * params.spring;
p.vy += (touchTrail[pIdx - 1].y - p.y) * params.spring;
p.vx *= params.friction;
p.vy *= params.friction;
p.x += p.vx;
p.y += p.vy;
}
});
for (let i = 1; i < touchTrail.length - 1; i++) {
const xc = .5 * (touchTrail[i].x + touchTrail[i + 1].x);
const yc = .5 * (touchTrail[i].y + touchTrail[i + 1].y);
ctx.quadraticCurveTo(touchTrail[i].x, touchTrail[i].y, xc, yc);
ctx.lineWidth = params.widthFactor * (params.pointsNumber - i);
ctx.stroke();
}
ctx.lineTo(touchTrail[touchTrail.length - 1].x, touchTrail[touchTrail.length - 1].y);
ctx.stroke();
mouse.x += (mouse.tX - mouse.x) * params.mouseThreshold;
mouse.y += (mouse.tY - mouse.y) * params.mouseThreshold;
window.requestAnimationFrame(updateBubbles);
}
function setupCanvas() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
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