ControlPointHandle.swift

struct ControlPointHandle: View {
    private let size: CGFloat = 20
    var body: some View {
        Circle()
            .frame(width: size, height: size)
            .overlay(
                Circle()
                    .stroke(Color.white, lineWidth: 2)
            )
            .offset(x: -size/2, y: -size/2)
    }
}