Example code for article about Audio Graphs - Using a categorical axis

CategoricalAxis.swift

// 1
enum Category: String {
    case UIKit, SwiftUI

    // 2
    static var order = [Category.UIKit.rawValue, Category.SwiftUI.rawValue]
}

// 3
private var categoricalXAxis: AXCategoricalDataAxisDescriptor {
    AXCategoricalDataAxisDescriptor(
        title: "UI Frameworks",
        categoryOrder: Category.order
    )
}

private var yAxis: AXNumericDataAxisDescriptor {
    AXNumericDataAxisDescriptor(
        title: "Number of years since introduction.",
        range: (0...12),
        gridlinePositions: [],
        valueDescriptionProvider: { (value: Double) -> String in
            "\(value)"
        }
    )
}

private var series: [AXDataSeriesDescriptor] {
    // 4
    let values: [(Category, Double)] = [
        (.UIKit, 12.0),
        (.SwiftUI, 3.0),
    ]

    // 5
    let dataPoints = values.map { (category, value) in
        AXDataPoint(x: category.rawValue, y: value)
    }

    return [
        AXDataSeriesDescriptor(
            name: "Age of UI frameworks",
            isContinuous: true,
            dataPoints: dataPoints
        )
    ]
}

var accessibilityChartDescriptor: AXChartDescriptor? {
    get {
        AXChartDescriptor(
            title: "Age of UI frameworks",
            summary: "This graph compares the age of UIKit and SwiftUI",
            xAxis: categoricalXAxis,
            yAxis: yAxis,
            series: series
        )
    }
    set { }
}