Web developer and autodidact with an interest in creative coding.
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What Goes Up ...
animation = (options = {}) => {
const {
width: w = 600,
height: h = w,
pixelRatio: dpr = window.devicePixelRatio || 1,
count: n = 70, // number of ellipses
lineWidth: lw = 1.5,
bgColor: bg = '#fff',
fillColor: fill = '#fff',
strokeColor: stroke = '#000',
// Params: t = global animation offset, ti = relative ellipse offset
t = (t) => 1 - t, // eased global offset
x = (t, ti) => w/2, // ellipse (x) offset, in px
y = (t, ti) => mix(-.1, 1.5, ti) * h, // ellipse (y) offset, in px
r = (t, ti) => mix(.1, .3, ease((ti-t+1) % 1, 2)) * h, // ellipse x (r)adius, in px
s = (t, ti) => mix(.55, .4, 1 - ease((ti+t) % 1, 4)), // ellipse y radius (s)cale relative to x radius
a = (t, ti) => mix(-.02, .07, ease((ti+t) % 1, 3)), // ellipse rotation (a)ngle, in radians
} = options;
const c = DOM.context2d(w, h, dpr);
c.lineWidth = lw;
c.strokeStyle = stroke;
c.canvas.style.maxWidth = '100%';
return _t => {
c.fillStyle = bg;
c.fillRect(0, 0, w, h);
c.fillStyle = fill;
const o = t(_t);
for(let i = 0; i < n; i++) {
const ti = i/n, _r = r(o, ti),
ellipse = (l = 0) => c.ellipse(
x(o, ti),
y(o, ti),
l + _r,
l + _r * s(o, ti),
a(o, ti) * Math.PI,
0,
Math.PI * 2
);
// We get a vastly better performance by drawing a fill instead of a stroke.
if(lw > 0) c.fillStyle = stroke; c.beginPath(); ellipse(lw*2); c.fill();
c.fillStyle = fill; c.beginPath(); ellipse(lw); c.fill();
}
return c.canvas;
};
}
// Params: t = animation offset [0..1[, n = repetition
ease = (t, n) => .5 + .5 * Math.cos(t * n * Math.PI * 2)
mix = (a, b, t) => a * (1 - t) + b * t
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