Maybe we turrn on after all

[rbdr/r.bdr.sh] / js / animation.js

diff --git a/js/animation.js b/js/animation.js
index 4c005d660771393b908ca4efa8b0624baa60d6db..6785a4fc2cb42636293a212dd5fe176e04f6b263 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,133 +1,110 @@
 (function () {
 
+  if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return
+
   var K = document.querySelector('canvas'),
-      { random: R, PI, cos: c, sin: s, floor, atan2 } = Math,
-      x = K.getContext('2d'),
-      fps = 24,
-      lst = 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)];
+    { 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 floor(R() * x);
+    return ~~(R() * x)
   }
 
   function sqr(i) {
-
-    var p = pos(i);
-    x.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);
-    x.beginPath();
-    x.arc(p.x, p.y, siz / 2, 0, 2 * PI);
-    x.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);
-    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();
+    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);
-    x.beginPath();
-    x.lineWidth = 5;
-    x.strokeStyle = `rgb(${i.c.join(',')})`;
-    x.moveTo(p.x, p.y);
-    x.lineTo(p.x * 10 * c(i.a), p.y * 10 * s(i.a));
-    x.stroke();
+    var {x, y} = pos(i)
+    B()
+    X.lineWidth = 5
+    X.strokeStyle = `hsl(0,0%,${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);
-    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();
-  }
-
-  function id(p) {
-
-    return p;
-  }
-
-  function spn(rad) {
-    return (p) => ({
-        x: p.x + rad * c(lst),
-        y: p.y + rad * s(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 * c(i.a);
-    i.y = i.y + spd * s(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 = atan2(s(i.a), -c(i.a))
+      i.a = A(S(i.a), -C(i.a))
     }
-
     if (i.y < 0 || i.y > 64) {
-      i.a = atan2(-s(i.a), c(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 && x.clearRect(0, 0, 64, 64);
+    if (dt > 1000 / f) {
+      k && X.clearRect(0, 0, 64, 64)
       for (var i of I) {
-        x.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?0:1&&frm()))
+  frm()
 }
-)();
+)()