The TDrawCircle structure.

 // DrawCircle
 TDrawCircle    struct
  Result                sbyte      // The function call result. NO_ERR means it succeeded.
  Center                TLocation  // The location of the circle center.
  Size          byte       // The circle radius.
  Options       dword          // The options to use when writing to the LCD.
 TDrawCircle    ends

See Drawing option constants for valid Options values.