点旋转的计算方法，以及推到公式，可用不线旋转和图像的旋转。-The point of rotation of the calculation method, and a push to the formula availability not line rotation, and rotation of the image.

拉个朗日插值公式是把PnX的构造问题转化为n+1插值基函数问题的构造(Pull a long day interpolation formula is into the problem of the structure of the PnX n + 1 interpolation basis function structure of the problem)