1 files changed, 1 insertions, 1 deletions
diff --git a/js/util.js b/js/util.js
index 4f707cf..ee2c110 100644
--- a/js/util.js
+++ b/js/util.js
@@ -42,7 +42,7 @@ function deg(n){ return n*180/PI }
 function rad(n){ return n*PI/180 }
 function pixel(x,y){ return 4*(mod(y,h)*w+mod(x,w)) }
 function rgbpixel(d,x,y){
-  var p = pixel(x,y)
+  var p = pixel(~~x,~~y)
   r = d[p]
   g = d[p+1]
   b = d[p+2]