# init(angle:innerRadius:outerRadius:angularInset:) Creates a sector mark, which uses the angular size to represent the proportion of the value to the sum of all values. ``` nonisolated init(angle: PlottableValue, innerRadius: MarkDimension = .automatic, outerRadius: MarkDimension = .automatic, angularInset: CGFloat? = nil) ``` ## Parameters `angle` A plottable value that will map to the angular size of the sector. It’s either a value that the angle within the full circle will be proportional with, or a value range for explicit start/end angles. `innerRadius` The inner radius of the sector. It is either a size in points, or a `.ratio` or `.inset` relative to the outer radius. `outerRadius` The outer radius of the sector. It is either a size in points, or a `.ratio`or `.inset` relative to the available plot area. `angularInset` A radius for the corners of the sector. ## Discussion Use this initializer to map angular positions to a sector for each data element. --- 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)