---
title: "ViewerBase..::.WheelZoomAmount Property "
canonical: https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_ViewerBase_WheelZoomAmount.htm
product: "Graphics Mill 5.5 for .NET"
---

This documentation is for the old version. [Go to the latest Graphics Mill docs](https://www.graphicsmill.com/docs/gm/)

# ViewerBase.WheelZoomAmount Property 
 
Gets/sets a zooming factor used during a mouse wheel scroll.
 
**Namespace:** [Aurigma.GraphicsMill.WinControls](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_WinControls.htm.md)
 **Assembly:** Aurigma.GraphicsMill.WinControls (in Aurigma.GraphicsMill.WinControls.dll)
 
## Syntax
  
```
<BrowsableAttribute(True)> _
Public Overridable Property WheelZoomAmount As Single
```
 
```csharp
[BrowsableAttribute(true)]
public virtual float WheelZoomAmount { get; set; }
```
 
### Property Value
A zooming factor used during a mouse wheel scroll.
 
## Remarks
  
The [Zoom](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_WinControls_ViewerBase_Zoom.htm.md) property is multiplied by this number when the mouse wheel is scrolled up and divided when the mouse wheel is scrolled down.
   
## See Also

### Reference

- [ViewerBase Class](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_WinControls_ViewerBase.htm.md)
- [Aurigma.GraphicsMill.WinControls Namespace](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_WinControls.htm.md)