1 files changed, 1 insertions, 0 deletions
diff --git a/js/util.js b/js/util.js
index fb15fb5..4f707cf 100644
--- a/js/util.js
+++ b/js/util.js
@@ -51,6 +51,7 @@ function rgbpixel(d,x,y){
 function mod(n,m){ return n-(m * floor(n/m)) }
 function dist(x0,y0,x1,y1){ return sqrt(pow(x1-x0,2)+pow(y1-y0,2)) }
 function angle(x0,y0,x1,y1){ return atan2(y1-y0,x1-x0) }
+function avg(m,n,a){ return (m*(a-1)+n)/a }
 
 function step (n,a,b) {
   return clamp((n - a) / (b - a), 0.0, 1.0);