NewNNI : An uniform method to Natural Neighbour Interpolation and Extrapolation, base on area stolen idea, also available to insert single site to Vononoi. 一种基于面积盗用思路的自然邻居插值算法，这个算法统一了内插和外插，也可以用于为Voronoi图增加单个基点 see more in docx file.