# in(_:) Maps a shape style’s unit-space coordinates to the absolute coordinates of a given rectangle. ``` func `in`(_ rect: CGRect) -> some ShapeStyle ``` ## Parameters `rect` A rectangle that gives the absolute coordinates over which to map the shape style. ## Return Value A new shape style mapped to the coordinates given by `rect`. ## Discussion Some shape styles have colors or patterns that vary with position based on [`UnitPoint`](/documentation/SwiftUI/UnitPoint) coordinates. For example, you can create a [`LinearGradient`](/documentation/SwiftUI/LinearGradient) using [`top`](/documentation/SwiftUI/UnitPoint/top) and [`bottom`](/documentation/SwiftUI/UnitPoint/bottom) as the start and end points: ``` let gradient = LinearGradient( colors: [.red, .yellow], startPoint: .top, endPoint: .bottom) ``` When rendering such styles, SwiftUI maps the unit space coordinates to the absolute coordinates of the filled shape. However, you can tell SwiftUI to use a different set of coordinates by supplying a rectangle to the `in(_:)` method. Consider two resizable rectangles using the gradient defined above: ``` HStack { Rectangle() .fill(gradient) Rectangle() .fill(gradient.in(CGRect(x: 0, y: 0, width: 0, height: 300))) } .onTapGesture { isBig.toggle() } .frame(height: isBig ? 300 : 50) .animation(.easeInOut) ``` When `isBig` is true — defined elsewhere as a private [`State`](/documentation/SwiftUI/State) variable — the rectangles look the same, because their heights match that of the modified gradient:  When the user toggles `isBig` by tapping the [`HStack`](/documentation/SwiftUI/HStack), the rectangles shrink, but the gradients each react in a different way:  SwiftUI remaps the gradient of the first rectangle to the new frame height, so that you continue to see the full range of colors in a smaller area. For the second rectangle, the modified gradient retains a mapping to the full height, so you instead see only a small part of the overall gradient. Animation helps to visualize the difference. --- 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)