diff --git a/chameleonic.p8 b/chameleonic.p8
index 4dbf81a..401cdc4 100644
--- a/chameleonic.p8
+++ b/chameleonic.p8
@@ -60,12 +60,11 @@ function linefill(ax,ay,bx,by,r,c)
  local ca,sa=dx/d,-dy/d
    
  -- polygon points
- local s={{0,-r},{d,-r},{d,r},{0,r}}
  local spans={}
  local function calcxy(u,v) return ax+u*ca+v*sa,ay-u*sa+v*ca end
  local x0,y0=calcxy(0,r)
- for i=1,4 do
-  local x1,y1=calcxy(unpack(s[i]))
+ for s in all{{0,-r},{d,-r},{d,r},{0,r}} do
+  local x1,y1=calcxy(unpack(s))
   local _x1,_y1=x1,y1
   if(y0>y1) x0,y0,x1,y1=x1,y1,x0,y0
   local dx=(x1-x0)/(y1-y0)