golf.swift

import SwiftUI

func unitSquareIntersectionPoint(_ angle: Angle) -> UnitPoint {
    let u = sin(angle.radians + .pi / 2)
    let v = cos(angle.radians + .pi / 2)

    let uSign = abs(u) / u
    let vSign = abs(v) / v

    if u * u >= v * v {
        return UnitPoint(
            x: 0.5 + 0.5 * uSign,
            y: 0.5 + 0.5 * uSign * (v / u)
        )
    } else {
        return UnitPoint(
            x: 0.5 + 0.5 * vSign * (u / v),
            y: 0.5 + 0.5 * vSign
        )
    }
}