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# concatenate(_:)

Appends the given transform to the context’s existing transform.

```
mutating func concatenate(_ matrix: CGAffineTransform)
```

## Parameters

`matrix`

A transform to append to the existing transform.

## Discussion

Calling this method is equivalent to updating the context’s
[`transform`](/documentation/SwiftUI/GraphicsContext/transform) directly using the `matrix` parameter:

```
transform = matrix.concatenating(transform)
```

---

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