学习了平面直角坐标系,我们现结合几个例题,谈谈平面直角坐标系中的格点问题.例1如图1,弹性小球从点P出发,沿图中所示方向运动,当小球碰到长方形OABC边时反弹,反射角等于入射角.小球第一次碰到边OA后撞击点为P_1,反射撞击边BC后撞击点为P_2,……,第n次碰到长方形的边时的撞击点为P_n,则点P_2的坐标为______,P_(2017)的坐标为______. Learning about the plane rectangular coordinate system, we now combine several examples to talk about the grid point problem in the Cartesian coordinate system. Example 1 As shown in Figure 1, the elastic ball starts from point P and moves along the direction shown in the figure when it is small. When the ball hits the edge of a rectangular OABC, it bounces, and the reflection angle is equal to the incident angle. The impact point is P_1 after the ball hits the edge OA for the first time, P_2 after the reflection impact edge BC, ..., and it hits the rectangle the nth time. When the collision point is P_n, the coordinate of point P_2 is ______, and the coordinate of P_(2017) is ______.