Simplify reduce motion check

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

diff --git a/js/animation.js b/js/animation.js
index ecf5e4352c34020b08da6af5824453ad69307d49..23d3ca5a7d5dd80188f61cef5d554ebed0ca1e73 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,5 +1,7 @@
 (function () {
 
+  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,
@@ -15,7 +17,8 @@
       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)]
+    draw = H[r(H.length)], pos = P[r(P.length)],
+    Z = 1
 
   function r(x) {
     return ~~(R() * x)
@@ -83,8 +86,10 @@
     i.c = (i.c + 2) % 101
   }
 
+  canvas.addEventListener('click', () => {Z ? Z=0:(Z=1;frm())})
+
   function frm(t) {
-    requestAnimationFrame(frm)
+    if (Z) requestAnimationFrame(frm)
 
     var dt = t - l