смоотх цуржес BY рICHARD бAIN фOR THOSE OF YOU INTERESTED IN THIS PROGRAM WITHOUT NEEDING TO KNOW ITS HISTORY, SMOOTH'CURVE IS AN ADVANCED CONNECT THE DOTS PROGRAM. иT DRAWS A LINE BETWEEN ALL THE POINTS ENTERED BY THE USER, IN THE SAME ORDER AS THEY WERE ENTERED. хOWEVER, INSTEAD OF DRAWING A STRAIGHT LINE BETWEEN THE POINTS, IT USES AN ADVANCED MATHEMATICAL TECHNIQUE KNOW AS CUBIC SPLINES TO DRAW AS SMOOTH A CURVE AS POSSIBLE. тO DEMONSTRATE THIS, A FUN DRAWING PROGRAM IS ON THIS DISK. уSE THE CURSOR KEYS TO MOVE A POINTER AROUND THE GRAPHICS SCREEN. пRESS <ретурн> FOR EACH POINT IN THE PATH TO BE DRAWN. вHEN ALL POINTS ARE ENTERED, PRESS TO START DRAWING THE CURVE. сMOOTH'CURVE WAS ORIGINALLY A фORTRAN PROGRAM THAT WAS TRANSLATED TO пASCAL AND THEN TO цомал. тHE пASCAL VERSION, ALONG WITH A 6 PAGE ARTICLE WITH PICTURES, IS IN пц тECH йOURNAL, аUGUST 1986. тHOSE OF YOU WITH ACCESS TO THAT MAGAZINE MAY BE SURPRISED AT HOW CLOSE THE цомал AND пASCAL LISTINGS ACTUALLY ARE. тHERE ARE ONLY TWO MAJOR DIFFERENCES. фIRST, THE пASCAL VERSION HAS ALL THE PROCEDURES LISTED BEFORE THE MAIN SECTION OF THE PROGRAM. цомал CAN BE WRITTEN THIS WAY, BUT MOST цомал PROGRAMMERS PREFER TO PUT THE MAIN SECTION OF THE PROGRAM BEFORE THE PROCEDURES. тHE SECOND MAIN DIFFERENCE IS IN THE NAMES OF THE KEYWORDS USED IN THE GRAPHICS COMMANDS. цомал 0.14 HAS TWO MORE DIFFERENCES FROM THE пASCAL VERSION. цомал 0.14 DOESN'T ALLOW FOR NESTED PROCEDURES OR THE PASSING OF ARRAYS BY VALUE. тHEREFORE, PROCEDURES NESTED IN THE пASCAL VERSION HAVE BEEN MOVED OUTSIDE IN THE цомал 0.14 VERSION. тHE PROCEDURE HEADERS WERE ALSO CHANGED TO MAKE ALL ARRAYS PASSED BY REFERENCE. тHESE TWO CHANGES WERE NOT NEEDED IN цомал 2.0. еVEN WITH THESE MINOR CHANGES, THE STRUCTURE OF BOTH THE цомал AND пASCAL VERSIONS OF SMOOTH'CURVE ARE THE SAME. фURTHER рEFERENCE: сMOOTH цURVES BY мICHAEL а. цOVINGTON PAGE 110, аUGUST 1986 пц тECH йOURNAL тHE вORLD тRADE цENTER сUITE 211 бALTIMORE, мд 21202 $29.97 PER YEAR SUBSCRIPTION.