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Disable unused reference sliders in Cassini example #39

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Merged
nighthawk merged 1 commit into from
May 9, 2026
Merged

Disable unused reference sliders in Cassini example #39

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18 changes: 17 additions & 1 deletion Examples/Cassini/ContentView+Model.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -25,8 +25,24 @@ extension ContentView {
case naturalEarth
case orthographic
case azimuthal

var id: String { rawValue }

/// Whether the projection's output depends on the reference latitude.
var usesReferenceLatitude: Bool {
switch self {
case .orthographic, .azimuthal: return true
case .equirectangular, .cassini, .mercator, .gallPeters, .equalEarth, .naturalEarth: return false
}
}

/// Whether the projection's output depends on the reference longitude.
var usesReferenceLongitude: Bool {
switch self {
case .cassini: return false
case .equirectangular, .mercator, .gallPeters, .equalEarth, .naturalEarth, .orthographic, .azimuthal: return true
}
}
}

struct Layer: Identifiable {
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8 changes: 5 additions & 3 deletions Examples/Cassini/ContentView.swift
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Expand Up @@ -203,25 +203,27 @@ struct OptionsView: View {
.frame(width: 100, alignment: .trailing)
}
.frame(minWidth: 200)

TextField(value: $model.refLat, format: .number.precision(.fractionLength(1))) {
EmptyView()
}
.frame(maxWidth: 55)
}

.disabled(!model.projectionType.usesReferenceLatitude)

HStack {
Slider(value: $model.refLng, in: -180...180) {
Text("Longitude")
.frame(width: 100, alignment: .trailing)
}
.frame(minWidth: 200)

TextField(value: $model.refLng, format: .number.precision(.fractionLength(1))) {
EmptyView()
}
.frame(maxWidth: 55)
}
.disabled(!model.projectionType.usesReferenceLongitude)
}

GroupBox("Edge Insets") {
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