diff --git a/chameleonic.p8 b/chameleonic.p8
index a348265..ee9f86c 100644
--- a/chameleonic.p8
+++ b/chameleonic.p8
@@ -137,10 +137,7 @@ function _rast(
  end
 
  local dx,dy=abs(x1-x0),abs(y1-y0)
- local sx=-1
- local sy=-1
- if (x0<x1) sx=1
- if (y0<y1) sy=1
+ local sx,sy=sgn(x1-x0),sgn(y1-y0)
 	
  local done,err
  if dx>dy then