Adjust the logic here

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

diff --git a/js/animation.js b/js/animation.js
index 979360181ee21edca1f606cc4f262e8a722b38d7..f1a624ddcfac3e798b142269e2571157cccaf6c4 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,102 +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: 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(${i.c.join(',')})`
-        x.moveTo(p.x, p.y)
-        x.lineTo(p.x * 10 * C(i.a), p.y * 10 * S(i.a))
-        x.stroke()
-      },
-      hrt = i => {
-        var p = pos(i)
-        x.fillRect(p.x, p.y, siz, siz)
-
-        x.beginPath()
-        x.arc(p.x + siz / 2, p.y, siz / 2, 0, 2 * PI, false)
-        x.fill()
-        x.closePath()
-
-        x.beginPath()
-        x.arc(p.x + siz, p.y + siz / 2, siz / 2, 0, 2 * PI, false)
-        x.fill()
-        x.closePath()
-      },
-      id = p => p,
-      spn = rad => (p => ({
+    { random: R, PI, cos: C, sin: S, atan2: A } = Math,
+    id = p => p,
+    spn = rad => p => ({
         x: p.x + rad * C(l),
         y: p.y + rad * S(l)
-      })),
-      mov = i => {
-        i.x = i.x + spd * C(i.a)
-        i.y = i.y + spd * S(i.a)
-
-        if (i.x < 0 || i.x > 64) {
-          i.a = A(S(i.a), -C(i.a))
-        }
-
-        if (i.y < 0 || i.y > 64) {
-          i.a = A(-S(i.a), C(i.a))
-        }
-      },
-      ucl = i => i.c = i.c.map(c => (c + 5) % 256),
-      frm = t => {
-        window.requestAnimationFrame(frm)
-
-        var dt = t - l
-
-        if (dt > 1000 / f) {
-          clr && x.clearRect(0, 0, 64, 64)
-          for (var i of I) {
-            x.fillStyle = `rgb(${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)]
+    }),
+    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)
+    X.fillRect(p.x, p.y, z, z)
+  }
+
+  function crc(i) {
+    var p = pos(i)
+    B()
+    X.arc(p.x, p.y, z / 2, 0, 2 * PI)
+    F()
+  }
+
+  function chs(i) {
+    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 {x, y} = pos(i)
+    B()
+    X.lineWidth = 5
+    X.strokeStyle = `hsl(0,0%,${i.c}%)`
+    X.moveTo(x, y)
+    X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
+    X.stroke()
+  }
+
+  function hrt(i) {
+    var {x, y} = pos(i)
+    X.fillRect(x, y, z, z)
+
+    B()
+    X.arc(x + z / 2, y, z / 2, 0, 2 * PI, false)
+    F()
+    X.closePath()
+
+    B()
+    X.arc(x + z, y + z / 2, z / 2, 0, 2 * PI, false)
+    F()
+    X.closePath()
+  }
+
+  function mov(i) {
+    i.x = i.x + s * C(i.a)
+    i.y = i.y + s * S(i.a)
+
+    if (i.x < 0 || i.x > 64) {
+      i.a = A(S(i.a), -C(i.a))
+    }
+    if (i.y < 0 || i.y > 64) {
+      i.a = A(-S(i.a), C(i.a))
+    }
+  }
+
+  function ucl(i) {
+    i.c = (i.c + 2) % 101
+  }
+
+  function frm(t) {
+    if (Z) requestAnimationFrame(frm)
+
+    var dt = t - l
+
+    if (dt > 1000 / f) {
+      k && X.clearRect(0, 0, 64, 64)
+      for (var i of I) {
+        X.fillStyle = `hsl(0,0%,${i.c}%)`
+        draw(i)
+        c && ucl(i)
+        mov(i)
+      }
+
+      l = t
+    }
+  }
 
+  K.addEventListener('click', () => (Z = Z ? 0:(frm(),1)))
   frm()
 }
 )()