Hi Charles,
there's a bug in the latest oxygen.dll
older dll, date o3.18.2o15 works.
include "asm.inc"
window 1024,800,1
single c, pc, clr, p, cm, x, y
for p=1 to 9600 step 0.1
pc +=1
c +=0.01
cm = c/2.6
x = cos(rad(p)) * (cm/c)*c
y = sin(rad(p)) * (cm/c)*c
color clr+12, clr-pc, clr+pc
fillcircle x+1024/2, y+800/2, 20
color clr+1, clr-pc, clr+pc
fillcircle x+1024/2, y+800/2, 20
clr +=1
if clr > 20 then clr=1
next
waitkey
winEnd
.