//
//  Stretchable.swift
//  Euclid
//
//  Created by Nick Lockwood on 21/11/2022.
//  Copyright © 2022 Nick Lockwood. All rights reserved.
//
//  Distributed under the permissive MIT license
//  Get the latest version from here:
//
//  https://github.com/nicklockwood/Euclid
//
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//  of this software and associated documentation files (the "Software"), to deal
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//
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//

/// Protocol for stretchable types.
protocol Stretchable {
    /// Returns a stretched copy of the value.
    /// - Parameters
    ///   - scaleFactor: A scale factor to apply to the value.
    ///   - along: The axis along which to apply the scale factor.
    func stretched(by scaleFactor: Double, along: Line) -> Self
}

extension Stretchable {
    /// Stretch the value in place.
    /// - Parameters
    ///   - scaleFactor: A scale factor to apply to the value.
    ///   - along: The axis along which to apply the scale factor.
    mutating func stretch(by scaleFactor: Double, along: Line) {
        self = stretched(by: scaleFactor, along: along)
    }
}

extension Path: Stretchable {
    func stretched(by scaleFactor: Double, along: Line) -> Path {
        Path(
            unchecked: points.map { $0.stretched(by: scaleFactor, along: along) },
            plane: nil,
            subpathIndices: subpathIndices
        )
    }
}

extension PathPoint: Stretchable {
    func stretched(by scaleFactor: Double, along: Line) -> PathPoint {
        PathPoint(
            position: position.stretched(by: scaleFactor, along: along),
            texcoord: texcoord,
            color: color,
            isCurved: isCurved
        )
    }
}

extension Vector: Stretchable {
    func stretched(by scaleFactor: Double, along: Line) -> Vector {
        self + project(onto: along) * (scaleFactor - 1)
    }
}

extension Array where Element: Stretchable {
    func stretched(by scaleFactor: Double, along: Line) -> Self {
        map { $0.stretched(by: scaleFactor, along: along) }
    }
}
