Relative.Vec.minus C# (CSharp) Method

        public Vec minus(Vec vec)
        {
            return new Vec(mX - vec.mX, mY - vec.mY);
        }

 public double getInvariant(Vec p0, Vec p1)
 {
     Vec delta = p0.minus(p1);
     if (mEuklide)
         return delta.mX * delta.mX + delta.mY * delta.mY;
     else
         return -delta.mX * delta.mX + delta.mY * delta.mY;
 }