Disk No: 1699                                                           
Disk Title: GRAFX                                                       
PC-SIG Version: S1                                                      
                                                                        
Program Title: GRAFX - Graphic Extension Library for FORTRAN 77         
Author Version: 2.1                                                     
Author Registration: None.                                              
Special Requirements: Fortran 77 compiler and CGA.                      
                                                                        
The GRAFX library consists of over 50 FORTRAN 77 callable routines,     
which allow FORTRAN programs access to the PC's graphic and other       
capabilities.  The graphic routines find application where emphasis is  
on ease of  implementation and rapid  presentation of  numerical  data. 
Three  levels of  capability  are included. The top level requires no   
knowledge of the PC or computer  graphics and is  suitable  for         
pedagogical  applications  such  as  numerical  methods instruction,    
quick-look  analysis  of  computational  progress,  and  for  the       
professional who is not primarily a  programmer. The middle level       
operates  in problem space and suports display of points, lines,        
circles, ellipses,  boxes, etc. to allow creation  of custom displays   
such  as map projections,  multiple graphic windows,  and 3D  displays. 
The  lowest level  consists of  primitives implemented in assembly      
language  which operate in  display space to  directly access display   
memory and access to selected DOS and BIOS functions.                   
                                                                        
Many miscellaneous routines  are included in  the library. These        
provide bit level access, shift, and logical  (AND, OR, NOT, EOR)       
operations  required by some applications. A standard  pseudo-random    
number generator, routines  to get time-of-day, time  in seconds, and   
date are included.  A vector  clipping routine is included which can  be
used to clip  a problem space vector  before drawing lines. If you      
really want to get  down to the bits  and bytes PEEK  & POKE routines   
are included to access any location in the 8086 address space.          
                                                                        
                                                                        
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