# init(xStart:xEnd:y:height:stacking:) Creates a bar mark that plots values on y with fixed x interval. ``` nonisolated init(xStart: CGFloat? = nil, xEnd: CGFloat? = nil, y: PlottableValue, height: MarkDimension = .automatic, stacking: MarkStackingMethod = .standard) where Y : Plottable ``` ## Parameters `xStart` The x start position. If `xStart` is `nil` then the rectangle will start at the leading edge of the plotting area. `xEnd` The x end position. If `xStart` is `nil` then the rectangle will end at the trailing edge of the plotting area. `y` The value plotted with y. `height` The bar height. If `height` is `nil`, the default bar size will be applied. `stacking` The stacking method for the bars with the same categorical/date values. If `stacking` is `nil`, the bars will not be stacked. ## Discussion ### Discussion Use this initializer to create a chart with a single vertical bar: ```swift Chart(data) { BarMark( y: .value("Profit", $0.profit) ) .foregroundStyle(by: .value("Product Category", $0.productCategory)) } ```  --- 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)