Add not only child styles

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

diff --git a/js/animation.js b/js/animation.js
index 907df5db1c635442bf43002f352a236ac446b56c..d5bc6b8f56faf29e8d62a524b8674736d2ff2cbf 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,13 +1,15 @@
 (function () {
 
   var canvas = document.querySelector('canvas'),
+      r = Math.random,
+      pi = Math.PI,
+      cos = Math.cos,
+      sin = Math.sin,
       context = canvas.getContext('2d'),
       fps = 30,
       lastFrame = 0,
       speed = 1,
-      size = 5 + rand(10),
-      r = Math.random,
-      pi = Math.PI;
+      size = 5 + rand(10);
 
   var clear = !!(r() > 0.5);
   var changeColor = !!(r() > 0.5);
@@ -45,7 +47,7 @@
     var p = position(item);
     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(p.x * 10 * cos(item.angle), p.y * 10 * sin(item.angle));
     context.lineTo(rand(64), rand(64));
     context.fill();
   }
@@ -57,7 +59,7 @@
     context.lineWidth = 5;
     context.strokeStyle = `rgb(${item.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(item.angle), p.y * 10 * sin(item.angle));
     context.stroke();
   }
 
@@ -92,23 +94,23 @@
     return function (position) {
 
       return {
-        x: position.x + radius * Math.cos(lastFrame),
-        y: position.y + radius * Math.sin(lastFrame)
+        x: position.x + radius * cos(lastFrame),
+        y: position.y + radius * sin(lastFrame)
       }
     }
   }
 
   function move(item) {
 
-    item.x = item.x + speed * Math.cos(item.angle);
-    item.y = item.y + speed * Math.sin(item.angle);
+    item.x = item.x + speed * cos(item.angle);
+    item.y = item.y + speed * sin(item.angle);
 
     if (item.x < 0 || item.x > 64) {
-      item.angle = Math.atan2(Math.sin(item.angle), -Math.cos(item.angle))
+      item.angle = Math.atan2(sin(item.angle), -cos(item.angle))
     }
 
     if (item.y < 0 || item.y > 64) {
-      item.angle = Math.atan2(-Math.sin(item.angle), Math.cos(item.angle))
+      item.angle = Math.atan2(-sin(item.angle), cos(item.angle))
     }
   }