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# CGAffineTransformInvert(_:)

Returns an affine transformation matrix constructed by inverting an existing affine transform.

```
func CGAffineTransformInvert(_ t: CGAffineTransform) -> CGAffineTransform
```

## Parameters

`t`

An existing affine transform.

## Return Value

A new affine transformation matrix. If the affine transform passed in parameter `t` cannot be inverted, the affine transform is returned unchanged.

## Discussion

Inversion is generally used to provide reverse transformation of points within transformed objects. Given the coordinates (x,y), which have been transformed by a given matrix to new coordinates (x’,y’), transforming the coordinates (x’,y’) by the inverse matrix produces the original coordinates (x,y).

---

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