petsc-3.12.4 2020-02-04
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# PetscDrawIsNull

Returns PETSC_TRUE if draw is a null draw object.

### Synopsis

    #include "petscdraw.h"
    PetscErrorCode  PetscDrawIsNull(PetscDraw draw,PetscBool *yes)

Not collective

### Input Parameter

draw -the draw context

### Output Parameter

yes -PETSC_TRUE if it is a null draw object; otherwise PETSC_FALSE

### Level

advanced

### Location

src/sys/classes/draw/impls/null/drawnull.c
Index of all Draw routines
Table of Contents for all manual pages
Index of all manual pages