diff --git a/Cubehelix.js b/Cubehelix.js
index 55e88b4..b9d354c 100644
--- a/Cubehelix.js
+++ b/Cubehelix.js
@@ -12,7 +12,7 @@
 // http://www.mrao.cam.ac.uk/~dag/CUBEHELIX/cubetry.html
 
 
-autowatch = 1;
+autowatch = 0;
 inlets = 1;
 outlets = 4;
 
@@ -113,14 +113,16 @@ function CubeHelixRGB(fract,start,rots,hue,gamma){
     var angle = 2*Math.PI*(start/3.0+1+rots*fract);
     var fract = Math.pow(fract, gamma);
     var amp=hue*fract*(1-fract)/2.0;
+    var acos = Math.cos(angle);
+    var asin = Math.sin(angle);
 
-    var r=fract+amp*(-0.14861*Math.cos(angle)+1.78277*Math.sin(angle));
+    var r=fract+amp*(-0.14861*acos+1.78277*asin);
     r=Math.max(Math.min(r,1.0),0.0);
 
-    var g=fract+amp*(-0.29227*Math.cos(angle)-0.90649*Math.sin(angle));
+    var g=fract+amp*(-0.29227*acos-0.90649*asin);
     g=Math.max(Math.min(g,1.0),0.0);
 
-    var b=fract+amp*(+1.97294*Math.cos(angle));
+    var b=fract+amp*(+1.97294*acos);
     b=Math.max(Math.min(b,1.0),0.0);
 
     return [r, g, b];