_base _dir Axis Axis Axis getBase getDirection move operator!= operator* operator*= operator= operator== projection reverse reversed setBase setDirection ~Axis

operator=() Axis & operator= ( const Axis &  New ) 重载 = 运算符 将一个轴的内容赋值给当前轴。 参数 [in] New 要赋值的轴 返回 当前轴的引用