MPE_Draw_logic
Sets logical operation for laying down new pixels
Synopsis
#include "mpe.h"
int MPE_Draw_logic( graph, function )
MPE_XGraph graph;
int function;
Input Parameters
 graph  MPE graphics handle

 function  integer specifying one of the following:

MPE_LOGIC_COPY  no logic, just copy the pixel
MPE_LOGIC_XOR  xor the new pixel with the existing one
and many more... see mpe_graphics.h
Notes For Fortran Interface
The Fortran interface to this routine is different from its C
counterpart and it has an additional argument, ierr, at the end
of the argument list, i.e. the returned function value (the error
code) in C interface is returned as the additional argument in
Fortran interface. The Fortran interface is invoked with the
CALL statement.
All MPI and MPE objects, MPI_Comm, MPE_XGraph and MPE_Color, are
of type INTEGER in Fortran.
Location:mpe_graphics.c