(function () {
- var canvas = document.querySelector('canvas'),
- r = Math.random,
- pi = Math.PI,
- cos = Math.cos,
- sin = Math.sin,
- ctx = canvas.getContext('2d'),
- fps = 24,
- lst = 0,
- spd = 1,
- siz = 5 + rnd(10),
- clr = !!(r() > 0.5),
- ccl = !!(r() > 0.5),
- I = Array(rnd(10) + 6).fill(null).map(() => ({
- x: rnd(64),
- y: rnd(64),
- a: r() * 2 * pi,
- c: Array(3).fill(rnd(256))
- })),
- SHP = [sqr, crc, hrt, chs, lch],
- POS = [id, spn(5), spn(15)],
- draw = SHP[rnd(SHP.length)],
- pos = POS[rnd(POS.length)];
-
- function rnd (x) {
- return Math.floor(r() * x);
+ if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return
+
+ var K = document.querySelector('canvas'),
+ { random: R, PI, cos: C, sin: S, atan2: A } = Math,
+ id = p => p,
+ spn = rad => p => ({
+ x: p.x + rad * C(l),
+ y: p.y + rad * S(l)
+ }),
+ X = K.getContext('2d'), F = X.fill.bind(X), B = X.beginPath.bind(X),
+ f = 24, l = 0, s = 1, z = 5 + r(10),
+ k = R() > 0.5, c = R() > 0.5,
+ I = Array(r(10) + 6).fill().map(() => ({
+ x: r(64), y: r(64),
+ a: R() * 2 * PI, c: r(100)
+ })),
+ H = [sqr, crc, hrt, chs, lch], P = [id, spn(5), spn(15)],
+ draw = H[r(H.length)], pos = P[r(P.length)],
+ Z = 1
+
+ function r(x) {
+ return ~~(R() * x)
}
function sqr(i) {
-
- var p = pos(i);
- ctx.fillRect(p.x, p.y, siz, siz);
+ var p = pos(i)
+ X.fillRect(p.x, p.y, z, z)
}
function crc(i) {
-
- var p = pos(i);
- ctx.beginPath();
- ctx.arc(p.x, p.y, siz / 2, 0, 2 * pi);
- ctx.fill();
+ var p = pos(i)
+ B()
+ X.arc(p.x, p.y, z / 2, 0, 2 * PI)
+ F()
}
function chs(i) {
-
- var p = pos(i);
- ctx.beginPath();
- ctx.moveTo(p.x, p.y);
- ctx.lineTo(p.x * 10 * cos(i.a), p.y * 10 * sin(i.a));
- ctx.lineTo(rnd(64), rnd(64));
- ctx.fill();
+ var {x, y} = pos(i)
+ B()
+ X.moveTo(x, y)
+ X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
+ X.lineTo(r(64), r(64))
+ F()
}
function lch(i) {
-
- var p = pos(i);
- ctx.beginPath();
- ctx.lineWidth = 5;
- ctx.strokeStyle = `rgb(${i.c.join(',')})`;
- ctx.moveTo(p.x, p.y);
- ctx.lineTo(p.x * 10 * cos(i.a), p.y * 10 * sin(i.a));
- ctx.stroke();
- }
-
- function sqr(i) {
-
- var p = pos(i);
- ctx.fillRect(p.x, p.y, siz, siz);
+ var {x, y} = pos(i)
+ B()
+ X.lineWidth = 5
+ X.strokeStyle = `hsl(0,0%,${i.c}%)`
+ X.moveTo(x, y)
+ X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
+ X.stroke()
}
function hrt(i) {
-
- var p = pos(i);
- ctx.fillRect(p.x, p.y, siz, siz);
-
- ctx.beginPath();
- ctx.arc(p.x + siz / 2, p.y, siz / 2, 0, 2 * pi, false);
- ctx.fill();
- ctx.closePath();
-
- ctx.beginPath();
- ctx.arc(p.x + siz, p.y + siz / 2, siz / 2, 0, 2 * pi, false);
- ctx.fill();
- ctx.closePath();
- }
-
- function id(p) {
-
- return p;
- }
-
- function spn(rad) {
- return function (p) {
-
- return {
- x: p.x + rad * cos(lst),
- y: p.y + rad * sin(lst)
- }
- }
+ var {x, y} = pos(i)
+ X.fillRect(x, y, z, z)
+
+ B()
+ X.arc(x + z / 2, y, z / 2, 0, 2 * PI, false)
+ F()
+ X.closePath()
+
+ B()
+ X.arc(x + z, y + z / 2, z / 2, 0, 2 * PI, false)
+ F()
+ X.closePath()
}
function mov(i) {
-
- i.x = i.x + spd * cos(i.a);
- i.y = i.y + spd * sin(i.a);
+ i.x = i.x + s * C(i.a)
+ i.y = i.y + s * S(i.a)
if (i.x < 0 || i.x > 64) {
- i.a = Math.atan2(sin(i.a), -cos(i.a))
+ i.a = A(S(i.a), -C(i.a))
}
-
if (i.y < 0 || i.y > 64) {
- i.a = Math.atan2(-sin(i.a), cos(i.a))
+ i.a = A(-S(i.a), C(i.a))
}
}
function ucl(i) {
-
- i.c = i.c.map((c) => {
- c = c + 5;
- return c > 255 ? 0 : c;
- })
+ i.c = (i.c + 2) % 101
}
function frm(t) {
+ if (Z) requestAnimationFrame(frm)
- window.requestAnimationFrame(frm);
-
- var dt = t - lst;
+ var dt = t - l
- if (dt > 1000 / fps) {
- clr && ctx.clearRect(0, 0, 64, 64);
+ if (dt > 1000 / f) {
+ k && X.clearRect(0, 0, 64, 64)
for (var i of I) {
- ctx.fillStyle = `rgb(${i.c.join(',')})`;
- draw(i);
- ccl && ucl(i);
- mov(i);
+ X.fillStyle = `hsl(0,0%,${i.c}%)`
+ draw(i)
+ c && ucl(i)
+ mov(i)
}
- lst = t;
+ l = t
}
}
- frm();
+ K.addEventListener('click', () => (Z ? Z=0:(Z=1&&frm())))
+ frm()
}
-)();
+)()
git.r.bdr.sh / rbdr / r.bdr.sh / blobdiff