chturtle.py 文件源码

def turn_right(self, angle):
        """Turn the turtle right about the axis perpendicular to the direction
        it is facing"""
        axis = (self.dir.cross(self.right))
        axis.normalize()
        self.dir.rotate(Quaternion(axis, math.radians(angle)))
        self.dir.normalize()
        self.right.rotate(Quaternion(axis, math.radians(angle)))
        self.right.normalize()