---
name: "MPE_Draw_logic"
section: "4"
platform: "linux"
package: "mpi-doc"
version: "1.2.7-9.1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/MPE_Draw_logic"
---

# MPE\_Draw\_logic(4)

Sets logical operation for laying down new pixels

## NAME

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