# init(x:y:) Creates a line mark. ``` nonisolated init(x: PlottableValue, y: PlottableValue) where X : Plottable, Y : Plottable ``` ## Parameters `x` The value plotted with x. `y` The value plotted with y. ## Discussion ### Discussion Use this initializer to create a chart with a single line. ```swift Chart(sunshineData) { LineMark( x: .value("Month", $0.date), y: .value("Hours of Sunshine", $0.hoursOfSunshine) ) } ```  --- 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)