---
title: "init(x:yStart:yEnd:)"
framework: charts
role: symbol
role_heading: Initializer
path: "charts/rulemark/init(x:ystart:yend:)-6zemd"
---

# init(x:yStart:yEnd:)

Creates a vertical rule mark with value plotted with x.

## Declaration

```swift
nonisolated init<X>(x: PlottableValue<X>, yStart: CGFloat? = nil, yEnd: CGFloat? = nil) where X : Plottable
```

## Parameters

- `x`: The value plotted with x.
- `yStart`: The y start position. If yStart is nil the rule will start at the leading edge of the plotting area.
- `yEnd`: The y end position. If yEnd is nil the rule will end at the trailing edge of the plotting area.

## Discussion

Discussion Use this initializer to create a vertical rule across a chart’s plotting area at an x position: Chart {     ForEach(data) {         BarMark(             x: .value("Profit", $0.profit),             y: .value("Department", $0.department)         )     }     RuleMark(x: .value("Break Even Threshold", 9000))         .foregroundStyle(.red) }

See the first code example in RuleMark for the setup of the structure that contains department and profit properties.