make js a bit smaller

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

diff --git a/js/animation.js b/js/animation.js
index 907df5db1c635442bf43002f352a236ac446b56c..b579fea1e0b197006ba05fc1bb9ea0dddf35cce0 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,75 +1,76 @@
 (function () {
 
   var canvas = document.querySelector('canvas'),
+      r = Math.random,
+      pi = Math.PI,
+      cos = Math.cos,
+      sin = Math.sin,
       context = canvas.getContext('2d'),
-      fps = 30,
+      fps = 24,
       lastFrame = 0,
       speed = 1,
-      size = 5 + rand(10),
-      r = Math.random,
-      pi = Math.PI;
-
-  var clear = !!(r() > 0.5);
-  var changeColor = !!(r() > 0.5);
-  var items = Array(rand(10) + 6).fill(null).map(() => ({
-    x: rand(64),
-    y: rand(64),
-    angle: r() * 2 * pi,
-    color: Array(3).fill(rand(256))
-  }));
-  var shapes = [square, circle, heart, chaos, lineChaos];
-  var positions = [identity, spin(5), spin(15)];
-  var draw = shapes[rand(shapes.length)];
-  var position = positions[rand(positions.length)];
-
-  function rand (x) {
+      size = 5 + rnd(10),
+      clear = !!(r() > 0.5),
+      changeColor = !!(r() > 0.5),
+      items = Array(rnd(10) + 6).fill(null).map(() => ({
+        x: rnd(64),
+        y: rnd(64),
+        angle: r() * 2 * pi,
+        color: Array(3).fill(rnd(256))
+      })),
+      shapes = [sqr, crc, hrt, chs, lch],
+      positions = [id, spn(5), spn(15)],
+      draw = shapes[rnd(shapes.length)],
+      pos = positions[rnd(positions.length)];
+
+  function rnd (x) {
     return Math.floor(r() * x);
   }
 
-  function square(item) {
+  function sqr(i) {
 
-    var p = position(item);
+    var p = pos(i);
     context.fillRect(p.x, p.y, size, size);
   }
 
-  function circle(item) {
+  function crc(i) {
 
-    var p = position(item);
+    var p = pos(i);
     context.beginPath();
     context.arc(p.x, p.y, size / 2, 0, 2 * pi);
     context.fill();
   }
 
-  function chaos(item) {
+  function chs(i) {
 
-    var p = position(item);
+    var p = pos(i);
     context.beginPath();
     context.moveTo(p.x, p.y);
-    context.lineTo(p.x * 10 * Math.cos(item.angle), p.y * 10 * Math.sin(item.angle));
-    context.lineTo(rand(64), rand(64));
+    context.lineTo(p.x * 10 * cos(i.angle), p.y * 10 * sin(i.angle));
+    context.lineTo(rnd(64), rnd(64));
     context.fill();
   }
 
-  function lineChaos(item) {
+  function lch(i) {
 
-    var p = position(item);
+    var p = pos(i);
     context.beginPath();
     context.lineWidth = 5;
-    context.strokeStyle = `rgb(${item.color.join(',')})`;
+    context.strokeStyle = `rgb(${i.color.join(',')})`;
     context.moveTo(p.x, p.y);
-    context.lineTo(p.x * 10 * Math.cos(item.angle), p.y * 10 * Math.sin(item.angle));
+    context.lineTo(p.x * 10 * cos(i.angle), p.y * 10 * sin(i.angle));
     context.stroke();
   }
 
-  function square(item) {
+  function sqr(i) {
 
-    var p = position(item);
+    var p = pos(i);
     context.fillRect(p.x, p.y, size, size);
   }
 
-  function heart(item) {
+  function hrt(i) {
 
-    var p = position(item);
+    var p = pos(i);
     context.fillRect(p.x, p.y, size, size);
 
     context.beginPath();
@@ -83,38 +84,38 @@
     context.closePath();
   }
 
-  function identity(position) {
+  function id(p) {
 
-    return position;
+    return p;
   }
 
-  function spin(radius) {
-    return function (position) {
+  function spn(rad) {
+    return function (p) {
 
       return {
-        x: position.x + radius * Math.cos(lastFrame),
-        y: position.y + radius * Math.sin(lastFrame)
+        x: p.x + rad * cos(lastFrame),
+        y: p.y + rad * sin(lastFrame)
       }
     }
   }
 
-  function move(item) {
+  function mov(i) {
 
-    item.x = item.x + speed * Math.cos(item.angle);
-    item.y = item.y + speed * Math.sin(item.angle);
+    i.x = i.x + speed * cos(i.angle);
+    i.y = i.y + speed * sin(i.angle);
 
-    if (item.x < 0 || item.x > 64) {
-      item.angle = Math.atan2(Math.sin(item.angle), -Math.cos(item.angle))
+    if (i.x < 0 || i.x > 64) {
+      i.angle = Math.atan2(sin(i.angle), -cos(i.angle))
     }
 
-    if (item.y < 0 || item.y > 64) {
-      item.angle = Math.atan2(-Math.sin(item.angle), Math.cos(item.angle))
+    if (i.y < 0 || i.y > 64) {
+      i.angle = Math.atan2(-sin(i.angle), cos(i.angle))
     }
   }
 
-  function updateColor(item) {
+  function updateColor(i) {
 
-    item.color = item.color.map((c) => {
+    i.color = i.color.map((c) => {
       c = c + 5;
       return c > 255 ? 0 : c;
     })
@@ -128,11 +129,11 @@
 
     if (delta > 1000 / fps) {
       clear && context.clearRect(0, 0, 64, 64);
-      for (var item of items) {
-        context.fillStyle = `rgb(${item.color.join(',')})`;
-        draw(item);
-        changeColor && updateColor(item);
-        move(item);
+      for (var i of items) {
+        context.fillStyle = `rgb(${i.color.join(',')})`;
+        draw(i);
+        changeColor && updateColor(i);
+        mov(i);
       }
 
       lastFrame = time;