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