# init(x:y:width:height:) Creates a rectangle that plots values with x and y. ``` nonisolated init(x: PlottableValue, y: PlottableValue, width: MarkDimension = .automatic, height: MarkDimension = .automatic) where X : Plottable, Y : Plottable ``` ## Parameters `x` The value plotted with x. `y` The value plotted with y. `width` The rectangle width. If `width` is not specified, then 70% of the step size will be used. If there is no step size a default width (in pts) will be used. `height` The rectangle height. If `height` is not specified, then 70% of the step size will be used. If there is no step size a default height (in pts) will be used. ## Discussion ### Discussion Use this initializer to map an x and y position to a rectangle for each data element. Optionally, specify the width or height of the rectangles. The example below omits the optional `width` and `height` parameters and uses a number scale starting at (0,0). The rectangle has the coordinates: (0,0), (0,3), (3,0), (3,3). ```swift Chart(data) { RectangleMark( x: .value("Rect X", 3), y: .value("Rect Y", 3) ) .opacity(0.2) PointMark( x: .value("X", $0.x), y: .value("Y", $0.y) ) } ```  --- 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)