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# PetscViewerDrawBaseSet
sets the base integer that is added to the `windownumber` passed to `PetscViewerDrawGetDraw()` 
## Synopsis
```
#include "petscdraw.h" 
#include "petscviewer.h" 
PetscErrorCode PetscViewerDrawBaseSet(PetscViewer viewer, PetscInt windownumber)
```
Logically Collective


## Input Parameters

- ***viewer -*** the `PetscViewer` (created with `PetscViewerDrawOpen()`)
- ***windownumber -*** value to set the base





## Note
A `PETSCVIEWERDRAW` may have multiple `PetscDraw` subwindows, this increases the number of the subwindow that is returned with `PetscViewerDrawGetDraw()`


## See Also
 [](sec_viewers), `PetscViewerDrawGetLG()`, `PetscViewerDrawGetAxis()`, `PetscViewerDrawOpen()`, `PetscViewerDrawGetDraw()`, `PetscViewerDrawBaseAdd()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/impls/draw/drawv.c.html#PetscViewerDrawBaseSet">src/sys/classes/viewer/impls/draw/drawv.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/viewer/impls/draw/drawv.c)


[Index of all Viewer routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)