Make sure your cutting edges cross over the center point of the donut. The cuttin g edges can be at any angle, not just 90 . Now, save this symbol as a drawing file and place it in your block library. This issue, we begin explaining the mysteries of AutoLISP programming by starting with the basics. Every expression has an opening and closing parenthesis.
Every expression has a function name.
Every expression gets evaluated and returns a result. The functi on found gives specific instructions on what is to be done with what comes next. One trick to AutoLISP programming is to know all of the functions that are available and how they work. But, there are literally hundreds of functions available. New Riders Publishe rs, Both of which come highly recommended.