Hi, First of all, visit my web page at : http://titools.home.ml.org Second of all this library will also contain Bresenham's circle algorithm, there is my question : the line code contains 4 vars and uses 5 data regs and one add reg, what do u think of this(only vars?, no vars?). BTW the 4 coords(x1,y1,x2,y2) are in 4 regs. Waiting for an answer. THANX C ya