An `AnimatableValues` implementation for iOS 17+

AnimatableValues.swift

//
//  Created by ktiays on 2026/1/16.
//  Copyright (c) 2026 ktiays. All rights reserved.
// 

import SwiftUI

@available(iOS 17.0, *)
public struct AnimatableValues<each Value>: VectorArithmetic where repeat each Value : VectorArithmetic {
    
    /// The tuple of values.
    public var value: (repeat each Value)
    
    /// The zero value.
    public static var zero: Self {
        .init(repeat (each Value).zero)
    }
    
    /// The dot-product of the tuple of animatable values with itself.
    public var magnitudeSquared: Double {
        var result: Double = 0
        for element in repeat each value {
            result += element.magnitudeSquared
        }
        return result
    }

    /// Creates a tuple of animatable values.
    public init(_ value: repeat each Value) {
        self.value = (repeat each value)
    }
    
    /// Multiplies each component of this value by the given value.
    public mutating func scale(by rhs: Double) {
        self.value = (repeat (each value).scaled(by: rhs))
    }
    
    public static func + (lhs: Self, rhs: Self) -> Self {
        .init(repeat (each lhs.value) + (each rhs.value))
    }
    
    public static func - (lhs: Self, rhs: Self) -> Self {
        .init(repeat (each lhs.value) - (each rhs.value))
    }
    
    public static func == (lhs: Self, rhs: Self) -> Bool {
        let (lhs, rhs) = (lhs.value, rhs.value)
        for (left, right) in repeat (each lhs, each rhs) {
            if left != right {
                return false
            }
        }
        return true
    }
}