Use header

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

diff --git a/js/animation.js b/js/animation.js
index c41d363e6ff4a638d0bab6f037b92851751c5408..df1673e1a226faff20791df83cf22749fabe0ef8 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,121 +1,97 @@
 (function () {
 
-  var K = document.querySelector('canvas'),
-      { random: R, PI, cos: C, sin: S, floor, 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 = 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)]
-
-  function r(x) {
-    return floor(R() * x)
-  }
-
-  function sqr(i) {
-
-    var {x, y} = pos(i)
-    X.fillRect(x, y, z, z)
-  }
-
-  function crc(i) {
-
-    var {x, y} = pos(i)
-    X.beginPath()
-    X.arc(x, y, z / 2, 0, 2 * PI)
-    X.fill()
-  }
-
-  function chs(i) {
+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 = r => p => ({
+    x: p.x + r * C(l),
+    y: p.y + r * 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)],
+dr = 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 mv(i) {
+  i.x = i.x + s * C(i.a)
+  i.y = i.y + s * S(i.a)
 
-    var {x, y} = pos(i)
-    X.beginPath()
-    X.moveTo(x, y)
-    X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
-    X.lineTo(r(64), r(64))
-    X.fill()
+  if (i.x < 0 || i.x > 64) {
+    i.a = A(S(i.a), -C(i.a))
   }
-
-  function lch(i) {
-
-    var {x, y} = pos(i)
-    X.beginPath()
-    X.lineWidth = 5
-    X.strokeStyle = `hsl(0,0,${i.c}%)`
-    X.moveTo(x, y)
-    X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
-    X.stroke()
+  if (i.y < 0 || i.y > 64) {
+    i.a = A(-S(i.a), C(i.a))
   }
-
-  function hrt(i) {
-
-    var {x, y} = pos(i)
-    X.fillRect(x, y, z, z)
-
-    X.beginPath()
-    X.arc(x + z / 2, y, z / 2, 0, 2 * PI, false)
-    X.fill()
-    X.closePath()
-
-    X.beginPath()
-    X.arc(x + z, y + z / 2, z / 2, 0, 2 * PI, false)
-    X.fill()
-    X.closePath()
-  }
-
-  function mov(i) {
-
-    i.x = i.x + s * C(i.a)
-    i.y = i.y + s * S(i.a)
-
-    if (i.x < 0 || i.x > 64) {
-      i.a = A(S(i.a), -C(i.a))
-    }
-    if (i.y < 0 || i.y > 64) {
-      i.a = A(-S(i.a), C(i.a))
+}
+function ucl(i) {i.c = (i.c + 2) % 101}
+function frm(t) {
+  if (Z) requestAnimationFrame(frm)
+  var dt = t - l
+  if (dt > 1000 / f) {
+    k && X.clearRect(0, 0, 64, 64)
+    for (var i of I) {
+      X.fillStyle = `hsl(0,0%,${i.c}%)`
+      dr(i)
+      c && ucl(i)
+      mv(i)
     }
-  }
 
-  function ucl(i) {
-    i.c = (i.c + 2) % 101
+    l = t
   }
-
-  function frm(t) {
-
-    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
-    }
-  }
-
-  frm()
 }
-)()
+
+K.addEventListener('click', () => ((Z=Z?0:1)&&frm()))
+frm()
+})()