"Traditional Constructor vs Primary Constructor"

// Before:
public struct Distance {
	double _dx;
	double _dy;

	public readonly double Magnitude => Math.Sqrt(_dx * _dx + _dy * _dy);
	public readonly double Direction => Math.Atan2(_dy, _dx);

	public void Translate(double deltaX, double deltaY) {
		_dx += deltaX;
		_dy += deltaY;
	}

	public Distance() : this(0, 0) { }

	public Distance(double dx, double dy) {
		_dx = dx;
		_dy = dy;
	}
}

// After:
public struct Distance(double dx, double dy) {
	public readonly double Magnitude => Math.Sqrt(dx * dx + dy * dy);
	public readonly double Direction => Math.Atan2(dy, dx);

	public void Translate(double deltaX, double deltaY) {
		dx += deltaX;
		dy += deltaY;
	}

	public Distance() : this(0, 0) { }
}