# convert(_:from:) Converts the point from the specified layer’s coordinate system to the receiver’s coordinate system. ``` func convert(_ p: CGPoint, from l: CALayer?) -> CGPoint ``` ## Parameters `p` A point specifying a location in the coordinate system of `l`. `l` The layer with `p` in its coordinate system. The receiver and `l` and must share a common parent layer. This parameter may be `nil`. ## Return Value The point converted to the receiver’s coordinate system. ## Discussion If you specify `nil` for the `l` parameter, this method returns the original point subtracted from the layer’s frame’s origin. The following example shows code that creates two layers, `redLayer` and `yellowLayer`. `yellowLayer` is scaled so that it is half of its original size. ```swift let layerFrame = CGRect(x: 0, y: 0, width: 640, height: 480) let redLayer = CALayer() redLayer.frame = layerFrame redLayer.backgroundColor = UIColor.red.cgColor let yellowLayer = CALayer() yellowLayer.frame = layerFrame yellowLayer.backgroundColor = UIColor.yellow.cgColor yellowLayer.transform = CATransform3DMakeScale(0.5, 0.5, 1) ``` The following figure shows the two layers and an overlaid point (rendered as a blue cross) with a position of `(50.0, 50.0)` in the red layer’s coordinate system.  The following code shows how you can find the coordinates of that point in the yellow layer’s coordinate system. ```swift let position = CGPoint(x: 50, y: 50) print(yellowLayer.convert(position, from: redLayer)) // prints (-220.0, -140.0) ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)