# init(xStart:xEnd:y:height:) Creates a bar mark that plots values with its x interval and y. ``` nonisolated init(xStart: PlottableValue, xEnd: PlottableValue, y: PlottableValue, height: MarkDimension = .automatic) where X : Plottable, Y : Plottable ``` ## Parameters `xStart` The value plotted with x start. `xEnd` The value plotted with x end. `y` The value plotted with y. `height` The bar height. If `height` is `nil`, the default bar size will be applied. ## Discussion ### Discussion Use this initializer to show horizontal intervals for one or more categories: ```swift Chart(data) { BarMark( xStart: .value("Start Time", $0.start), xEnd: .value("End Time", $0.end), y: .value("Job", $0.job) ) } ```  --- 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)