# init(x:yStart:yEnd:width:stacking:) Creates a bar mark that plots a value on x with fixed y interval. ``` nonisolated init(x: PlottableValue, yStart: CGFloat? = nil, yEnd: CGFloat? = nil, width: MarkDimension = .automatic, stacking: MarkStackingMethod = .standard) where X : Plottable ``` ## Parameters `x` The value plotted with x. `yStart` The y start position. If `yStart` is `nil` then the rectangle will start at the leading edge of the plotting area. `yEnd` The y end position. If `yEnd` is `nil` then the rectangle will end at the trailing edge of the plotting area. `width` The bar width. If `width` 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 horizontal bar: ```swift Chart(data) { BarMark( x: .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)