通过cartisian move将发送给机械臂的直角坐标系下的运动控制命令转换为机械臂各个关节的运动角度，实现使用机械臂在一个平面上写字的功能。-Through the move cartisian will be sent to the robot arm in Cartesian coordinates of the motion control command is converted to the mechanical arm of each joint movement angle,