# init(x:y:) Creates a point mark that plots a value on x with fixed y position. ``` nonisolated init(x: PlottableValue, y: CGFloat? = nil) where X : Plottable ``` ## Parameters `x` The value plotted with x. `y` The y position. If `y` is `nil`, the bar will be centered vertically by default. ## Discussion ### Discussion Use this initializer to plot a property with x: ```swift Chart(data) { PointMark( x: .value("Weight", $0.weight) ) } ```  For more background, see the first example used in [`PointMark`](/documentation/Charts/PointMark) which shows the structure that contains the `weight` property. --- 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)