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68 lines
2.1 KiB
Swift
68 lines
2.1 KiB
Swift
import Chart
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import CoreApi
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final class ElevationProfileFormatter {
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private enum Constants {
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static let metricToImperialMultiplier: CGFloat = 0.3048
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static var metricAltitudeStep: CGFloat = 50
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static var imperialAltitudeStep: CGFloat = 100
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}
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private let distanceFormatter: DistanceFormatter.Type
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private let altitudeFormatter: AltitudeFormatter.Type
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private let unitSystemMultiplier: CGFloat
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private let altitudeStep: CGFloat
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private let units: Units
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init(units: Units = Settings.measurementUnits()) {
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self.units = units
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self.distanceFormatter = DistanceFormatter.self
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self.altitudeFormatter = AltitudeFormatter.self
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switch units {
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case .metric:
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self.altitudeStep = Constants.metricAltitudeStep
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self.unitSystemMultiplier = 1
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case .imperial:
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self.altitudeStep = Constants.imperialAltitudeStep
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self.unitSystemMultiplier = Constants.metricToImperialMultiplier
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@unknown default:
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fatalError("Unsupported units")
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}
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}
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}
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extension ElevationProfileFormatter: ChartFormatter {
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func xAxisString(from value: Double) -> String {
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distanceFormatter.distanceString(fromMeters: value)
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}
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func yAxisString(from value: Double) -> String {
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altitudeFormatter.altitudeString(fromMeters: value)
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}
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func yAxisLowerBound(from value: CGFloat) -> CGFloat {
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floor((value / unitSystemMultiplier) / altitudeStep) * altitudeStep * unitSystemMultiplier
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}
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func yAxisUpperBound(from value: CGFloat) -> CGFloat {
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ceil((value / unitSystemMultiplier) / altitudeStep) * altitudeStep * unitSystemMultiplier
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}
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func yAxisSteps(lowerBound: CGFloat, upperBound: CGFloat) -> [CGFloat] {
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let lower = yAxisLowerBound(from: lowerBound)
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let upper = yAxisUpperBound(from: upperBound)
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let range = upper - lower
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var stepSize = altitudeStep
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var stepsCount = Int((range / stepSize).rounded(.up))
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while stepsCount > 6 {
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stepSize *= 2 // Double the step size to reduce the step count
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stepsCount = Int((range / stepSize).rounded(.up))
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}
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let steps = stride(from: lower, through: upper, by: stepSize)
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return Array(steps)
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}
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}
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