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


## Input Parameters

- ***viewer -*** the `PetscViewer` (created with `PetscViewerDrawOpen()`)
- ***windownumber -*** how much to add to 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()`, `PetscViewerDrawBaseSet()`

## Level
developer

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


---
[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](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
