如何在 SwiftUI 中为 strokeBorder 的 HexagonShape 中将 insetAmount 实现为 dx 和 dy？

我有一个类似以下代码的形状：

import SwiftUI

struct ContentView: View {
    var body: some View {
        
        let myCustomInsettableShape = HexagonShape(thickness: 100.0)
        
        ZStack {

            myCustomInsettableShape
                .fill(Color.blue)

            myCustomInsettableShape
             .strokeBorder(Color.black.opacity(0.5), style: StrokeStyle(lineWidth: 50.0, lineCap: .round, lineJoin: .miter))
            
        }
        .background(Color.red)
        .padding(50)
    }
}


struct HexagonShape: InsettableShape {
    
    var thickness: CGFloat
    var insetAmount: CGFloat = CGFloat.zero
    
    func path(in rect: CGRect) -> Path {
        
        var path: Path = Path()
        
        let halfThickness: CGFloat = thickness/2.0

        let dx: CGFloat
        let dy: CGFloat
        
        if (insetAmount > .zero) && (halfThickness > .zero) {
            let diagonal = sqrt((halfThickness * halfThickness) + (halfThickness * halfThickness))
            dx = insetAmount * diagonal / halfThickness
            dy = insetAmount * diagonal / halfThickness
        } else {
            dx = .zero
            dy = .zero
        }

        path.move(to: CGPoint(x: rect.minX + dx, y: rect.minY + halfThickness))
        path.addLine(to: CGPoint(x: rect.midX, y: rect.minY + dy))
        path.addLine(to: CGPoint(x: rect.maxX - dx, y: rect.minY + halfThickness))
        path.addLine(to: CGPoint(x: rect.maxX - dx, y: rect.maxY - halfThickness))
        path.addLine(to: CGPoint(x: rect.midX, y: rect.maxY - dy))
        path.addLine(to: CGPoint(x: rect.minX + dx, y: rect.maxY - halfThickness))
        path.closeSubpath()

        return path
        
    }
    
    func inset(by amount: CGFloat) -> some InsettableShape {
        var myShape: Self = self
        myShape.insetAmount += amount
        return myShape
    }
    
}

形状的结果如下：

蓝色填充的形状是我想要的，并且我希望我的 strokeBorder 具有相同的形状，但我不知道如何实现 insetAmount，thickness 是一个可以改变的值，显示和说明形状的形式。