Return unit vector of a point with positive coordinates.

def abs_unit(self):
        """Return unit vector of a point with positive coordinates."""
        s = self.x * self.x + self.y * self.y
        if s < 1e-5:
            return Point(0,0)
        s = math.sqrt(s)
        return Point(abs(self.x) / s, abs(self.y) / s)