Method cos

samgeo/fer.py:57–65

(self, v)

        return math.sqrt(math.pow(self.x, 2) + math.pow(self.y, 2))

    def cos(self, v):
        dot = self.x * v.x + self.y * v.y
        cos = dot / (math.sqrt(math.pow(self.x, 2) + math.pow(self.y, 2)) * v.length())

        if cos > 1:
            cos = 1
        if cos < -1:
            cos = -1
        return 180 / math.pi * math.acos(cos)

    def k(self):
        k = (self.y2 - self.y1) / (self.x2 - self.x1)