Further reduce

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

diff --git a/js/animation.js b/js/animation.js
index 3f44cd81ac8ce48e63d527da7b4ca22a1eb944ef..4c005d660771393b908ca4efa8b0624baa60d6db 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,24 +1,24 @@
 (function () {
 
   var K = document.querySelector('canvas'),
-      { random: R, PI, cos, sin, floor, atan2 } = Math,
-      ctx = K.getContext('2d'),
+      { 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(null).map(() => ({
+      I = Array(r(10) + 6).fill().map(() => ({
         x: r(64),
         y: r(64),
         a: R() * 2 * PI,
         c: Array(3).fill(r(256))
       })),
-      SHP = [sqr, crc, hrt, chs, lch],
-      POS = [id, spn(5), spn(15)],
-      draw = SHP[r(SHP.length)],
-      pos = POS[r(POS.length)];
+      S = [sqr, crc, hrt, chs, lch],
+      P = [id, spn(5), spn(15)],
+      draw = S[r(S.length)],
+      pos = P[r(P.length)];
 
   function r(x) {
     return floor(R() * x);
@@ -27,52 +27,52 @@
   function sqr(i) {
 
     var p = pos(i);
-    ctx.fillRect(p.x, p.y, siz, siz);
+    x.fillRect(p.x, p.y, siz, siz);
   }
 
   function crc(i) {
 
     var p = pos(i);
-    ctx.beginPath();
-    ctx.arc(p.x, p.y, siz / 2, 0, 2 * PI);
-    ctx.fill();
+    x.beginPath();
+    x.arc(p.x, p.y, siz / 2, 0, 2 * PI);
+    x.fill();
   }
 
   function chs(i) {
 
     var p = pos(i);
-    ctx.beginPath();
-    ctx.moveTo(p.x, p.y);
-    ctx.lineTo(p.x * 10 * cos(i.a), p.y * 10 * sin(i.a));
-    ctx.lineTo(r(64), r(64));
-    ctx.fill();
+    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();
   }
 
   function lch(i) {
 
     var p = pos(i);
-    ctx.beginPath();
-    ctx.lineWidth = 5;
-    ctx.strokeStyle = `rgb(${i.c.join(',')})`;
-    ctx.moveTo(p.x, p.y);
-    ctx.lineTo(p.x * 10 * cos(i.a), p.y * 10 * sin(i.a));
-    ctx.stroke();
+    x.beginPath();
+    x.lineWidth = 5;
+    x.strokeStyle = `rgb(${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();
   }
 
   function hrt(i) {
 
     var p = pos(i);
-    ctx.fillRect(p.x, p.y, siz, siz);
+    x.fillRect(p.x, p.y, siz, siz);
 
-    ctx.beginPath();
-    ctx.arc(p.x + siz / 2, p.y, siz / 2, 0, 2 * PI, false);
-    ctx.fill();
-    ctx.closePath();
+    x.beginPath();
+    x.arc(p.x + siz / 2, p.y, siz / 2, 0, 2 * PI, false);
+    x.fill();
+    x.closePath();
 
-    ctx.beginPath();
-    ctx.arc(p.x + siz, p.y + siz / 2, siz / 2, 0, 2 * PI, false);
-    ctx.fill();
-    ctx.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) {
@@ -81,26 +81,23 @@
   }
 
   function spn(rad) {
-    return function (p) {
-
-      return {
-        x: p.x + rad * cos(lst),
-        y: p.y + rad * sin(lst)
-      }
-    }
+    return (p) => ({
+        x: p.x + rad * c(lst),
+        y: p.y + rad * s(lst)
+    })
   }
 
   function mov(i) {
 
-    i.x = i.x + spd * cos(i.a);
-    i.y = i.y + spd * sin(i.a);
+    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 = atan2(sin(i.a), -cos(i.a))
+      i.a = atan2(s(i.a), -c(i.a))
     }
 
     if (i.y < 0 || i.y > 64) {
-      i.a = atan2(-sin(i.a), cos(i.a))
+      i.a = atan2(-s(i.a), c(i.a))
     }
   }
 
@@ -119,9 +116,9 @@
     var dt = t - lst;
 
     if (dt > 1000 / fps) {
-      clr && ctx.clearRect(0, 0, 64, 64);
+      clr && x.clearRect(0, 0, 64, 64);
       for (var i of I) {
-        ctx.fillStyle = `rgb(${i.c.join(',')})`;
+        x.fillStyle = `rgb(${i.c.join(',')})`;
         draw(i);
         ccl && ucl(i);
         mov(i);