# init(xStart:xEnd:yStart:yEnd:) Creates a bar mark that plots values with its x interval and fixed y position. ``` nonisolated init(xStart: PlottableValue, xEnd: PlottableValue, yStart: CGFloat? = nil, yEnd: CGFloat? = nil) where X : Plottable ``` ## Parameters `xStart` The value plotted with x start. `xEnd` The value plotted with x end. ## Discussion ### Discussion Use this initializer to show horizontal intervals for one category: ```swift Chart(data) { BarMark( xStart: .value("Start Time", $0.start), xEnd: .value("End Time", $0.end) ) } ```  --- 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)