dave-enterprise
87f8c7173c
Adds the real MoonWatch implementation on top of the initial Xcode template: new SwiftUI views (MoonDiskView, StarFieldView), the MoonWatchWidget extension, and a Shared module containing the moon phase calculator, shadow shape, and shared asset catalog. Also adds a Swift/Xcode/macOS .gitignore and untracks per-user xcuserdata files. Co-authored-by: Cursor <cursoragent@cursor.com>
63 lines
2.1 KiB
Swift
63 lines
2.1 KiB
Swift
//
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// MoonShadowShape.swift
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// Shared between MoonWatch and MoonWatchWidget.
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//
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import SwiftUI
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/// Geometric terminator: half-circle along the dark limb stitched to a
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/// half-ellipse whose horizontal axis = cos(2π·t)·R. Renders correctly at
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/// new (full dark), quarter (straight terminator), gibbous, and full
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/// (no shadow). Slight `oversizeFactor` lets a parent `Circle` clip keep
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/// the limb sharp while a small `.blur` softens the terminator.
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public struct MoonShadowShape: Shape {
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public var phaseFraction: Double
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public var oversizeFactor: CGFloat
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public init(phaseFraction: Double, oversizeFactor: CGFloat = 1.04) {
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self.phaseFraction = phaseFraction
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self.oversizeFactor = oversizeFactor
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}
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public var animatableData: Double {
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get { phaseFraction }
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set { phaseFraction = newValue }
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}
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public func path(in rect: CGRect) -> Path {
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let r = min(rect.width, rect.height) / 2
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let outer = r * oversizeFactor
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let cx = rect.midX
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let cy = rect.midY
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let raw = phaseFraction.truncatingRemainder(dividingBy: 1)
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let u = raw < 0 ? raw + 1 : raw
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let cosT = CGFloat(cos(2 * Double.pi * u))
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let waning = u > 0.5
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let bulge: CGFloat = waning ? -cosT * outer : cosT * outer
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let kappa: CGFloat = 0.5522847498
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var path = Path()
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let top = CGPoint(x: cx, y: cy - outer)
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path.move(to: top)
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path.addArc(
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center: CGPoint(x: cx, y: cy),
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radius: outer,
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startAngle: .degrees(270),
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endAngle: .degrees(90),
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clockwise: !waning
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)
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path.addCurve(
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to: CGPoint(x: cx + bulge, y: cy),
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control1: CGPoint(x: cx + bulge * kappa, y: cy + outer),
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control2: CGPoint(x: cx + bulge, y: cy + outer * kappa)
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)
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path.addCurve(
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to: top,
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control1: CGPoint(x: cx + bulge, y: cy - outer * kappa),
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control2: CGPoint(x: cx + bulge * kappa, y: cy - outer)
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)
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path.closeSubpath()
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return path
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}
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}
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