---
title: backingScaleFactor()
framework: Professional Video Applications
role: symbol
role_heading: Instance Method
platforms: [fxplug 3.1+]
path: professional_video_applications/fxonscreencontrolapi_v3/backingscalefactor()
---

# backingScaleFactor()

Returns the scale factor for drawing the on-screen control to the current screen.

## Declaration

```swift
func backingScaleFactor() -> Double
```

## Return Value

Return Value The scale factor.

## Discussion

Discussion Vertex coordinates already scale properly, but this method can be used for other types of drawings. For example, if you are preparing a texture on the CPU and uploading it, this can tell you how large to make the texture before uploading it.