Method rotate

recipes/Python/578006_vector/recipe-578006.py:435–437

(self, vec)

        return Vector2(x * temp, y * temp)

    def rotate(self, vec):
        x1, y1, x2, y2 = self.x, self.y, vec.x, vec.y
        return Vector2(x1 * x2 + y1 * y2, y1 * x2 - x1 * y2)

    def interpolate(self, vec, bias):
        a = 1 - bias