# ScaleDomain A type that you can use to configure the domain of a chart. ``` protocol ScaleDomain ``` ## Overview A type you use to configure the domain of a chart scale. ## Including zero in number scales By default, number scales include zero in the domain to ensure charts follow the best practice to include a zero baseline in bar charts.  For other marks, this zero baseline isn’t as important, but the framework includes zero by default so the domain inference logic is consistent and deterministic. Changing the mark type won’t suddenly affect scale domain.  If you don’t want to include the zero baseline in certain cases, use `automatic(includeszero:reversed:)` to customize the scale domain and disable the automatic zero inclusion. ```swift Chart([20, 30, 50, 70, 85], id: \.self) { PointMark( x: .value("Value", $0) ) } .chartXScale(domain: .automatic(includesZero: false)) ```  ## Reversing the order of inferred domain You can also reverse the order of the inferred domain: ```swift Chart([20, 30, 50, 70, 85], id: \.self) { PointMark( x: .value("Value", $0) ) } .chartXScale(domain: .automatic(reversed: true)) ```  ## Topics ### Type Properties [`static var automatic: AutomaticScaleDomain`](/documentation/Charts/ScaleDomain/automatic) Creates a scale domain configuration that infers the scale domain from data. ### Type Methods [`static func automatic(includesZero: Bool?, reversed: Bool?) -> AutomaticScaleDomain`](/documentation/Charts/ScaleDomain/automatic(includesZero:reversed:)) Creates a scale domain configuration that infers the scale domain from data. [`static func automatic(includesZero: Bool?, reversed: Bool?, dataType: DataValue.Type, modifyInferredDomain: (inout [DataValue]) -> Void) -> AutomaticScaleDomain`](/documentation/Charts/ScaleDomain/automatic(includesZero:reversed:dataType:modifyInferredDomain:)) Creates a scale domain configuration that infers the scale domain from data. ## Relationships ### Conforming Types [`AutomaticScaleDomain`](/documentation/Charts/AutomaticScaleDomain) --- 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)