diff --git a/NeoPatterns.cpp b/NeoPatterns.cpp
index 23a41a2..842e984 100644
--- a/NeoPatterns.cpp
+++ b/NeoPatterns.cpp
@@ -778,16 +778,16 @@ uint32_t NeoPatterns::Wheel(byte WheelPos)
 // Convert x y pixel position to matrix position
 uint8_t NeoPatterns::xyToPos(int x, int y) {
   if (y % 2 == 0) {
-    return (y * 8 + x);
+    return (y * (int)sqrt(numPixels()) + x);
   } else {
-    return (y * 8 + (7 - x));
+    return (y * (int)sqrt(numPixels()) + (((int)sqrt(numPixels())-1) - x));
   }
 }
 
 //convert pixel number to actual 8x8 matrix position
 uint8_t NeoPatterns::numToPos(int num) {
-  int x = num % 8;
-  int y = num / 8;
+  int x = num % (int)sqrt(numPixels());
+  int y = num / (int)sqrt(numPixels());
   return xyToPos(x, y);
 }