(function () {
- var canvas = document.querySelector('canvas'),
- r = Math.random,
- pi = Math.PI,
- cos = Math.cos,
- sin = Math.sin,
- context = canvas.getContext('2d'),
- fps = 24,
- lastFrame = 0,
- speed = 1,
- size = 5 + rnd(10),
- clear = !!(r() > 0.5),
- changeColor = !!(r() > 0.5),
- items = Array(rnd(10) + 6).fill(null).map(() => ({
- x: rnd(64),
- y: rnd(64),
- angle: r() * 2 * pi,
- color: Array(3).fill(rnd(256))
- })),
- shapes = [sqr, crc, hrt, chs, lch],
- positions = [id, spn(5), spn(15)],
- draw = shapes[rnd(shapes.length)],
- pos = positions[rnd(positions.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);
- context.fillRect(p.x, p.y, size, size);
+ var p = pos(i)
+ X.fillRect(p.x, p.y, z, z)
}
function crc(i) {
-
- var p = pos(i);
- context.beginPath();
- context.arc(p.x, p.y, size / 2, 0, 2 * pi);
- context.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);
- context.beginPath();
- context.moveTo(p.x, p.y);
- context.lineTo(p.x * 10 * cos(i.angle), p.y * 10 * sin(i.angle));
- context.lineTo(rnd(64), rnd(64));
- context.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);
- context.beginPath();
- context.lineWidth = 5;
- context.strokeStyle = `rgb(${i.color.join(',')})`;
- context.moveTo(p.x, p.y);
- context.lineTo(p.x * 10 * cos(i.angle), p.y * 10 * sin(i.angle));
- context.stroke();
- }
-
- function sqr(i) {
-
- var p = pos(i);
- context.fillRect(p.x, p.y, size, size);
+ var {x, y} = pos(i)
+ B()
+ X.lineWidth = 5
+ X.strokeStyle = `hsl(0,0%,${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);
- context.fillRect(p.x, p.y, size, size);
-
- context.beginPath();
- context.arc(p.x + size / 2, p.y, size / 2, 0, 2 * pi, false);
- context.fill();
- context.closePath();
-
- context.beginPath();
- context.arc(p.x + size, p.y + size / 2, size / 2, 0, 2 * pi, false);
- context.fill();
- context.closePath();
- }
-
- function id(p) {
-
- return p;
- }
-
- function spn(rad) {
- return function (p) {
-
- return {
- x: p.x + rad * cos(lastFrame),
- y: p.y + rad * sin(lastFrame)
- }
- }
+ 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 + speed * cos(i.angle);
- i.y = i.y + speed * sin(i.angle);
+ i.x = i.x + s * C(i.a)
+ i.y = i.y + s * S(i.a)
if (i.x < 0 || i.x > 64) {
- i.angle = Math.atan2(sin(i.angle), -cos(i.angle))
+ i.a = A(S(i.a), -C(i.a))
}
-
if (i.y < 0 || i.y > 64) {
- i.angle = Math.atan2(-sin(i.angle), cos(i.angle))
+ i.a = A(-S(i.a), C(i.a))
}
}
- function updateColor(i) {
-
- i.color = i.color.map((c) => {
- c = c + 5;
- return c > 255 ? 0 : c;
- })
+ function ucl(i) {
+ i.c = (i.c + 2) % 101
}
- function frame(time) {
-
- window.requestAnimationFrame(frame);
+ function frm(t) {
+ if (Z) requestAnimationFrame(frm)
- var delta = time - lastFrame;
+ var dt = t - l
- if (delta > 1000 / fps) {
- clear && context.clearRect(0, 0, 64, 64);
- for (var i of items) {
- context.fillStyle = `rgb(${i.color.join(',')})`;
- draw(i);
- changeColor && updateColor(i);
- mov(i);
+ if (dt > 1000 / f) {
+ k && X.clearRect(0, 0, 64, 64)
+ for (var i of I) {
+ X.fillStyle = `hsl(0,0%,${i.c}%)`
+ draw(i)
+ c && ucl(i)
+ mov(i)
}
- lastFrame = time;
+ l = t
}
}
- frame();
+ K.addEventListener('click', () => (Z=0))
+ frm()
}
-)();
+)()
git.r.bdr.sh / rbdr / r.bdr.sh / blobdiff