First attempt at snapping to angle intervals in Trgnmtry

snapping-angle-first-attempt.swift

public func snappedAngle(snappingAngle: Angle) -> Angle {
    if snappingAngle.radians == 0 {
        return self
    }

    let interval = Int(degrees / (snappingAngle.degrees / 2))

    if interval == 0 {
        return .zero
    } else if interval == Int(360 / (snappingAngle.degrees / 2) - 1) {
        return Angle(degrees: 360)
    } else {
        let factor = interval / 2
        return Angle(radians: snappingAngle.radians * Radian(factor))
    }
}