Introduction - If you have any usage issues, please Google them yourself
two points of linear interpolation algorithm for determining points : one, the basic formula y = (y2- y1) (x-x)/(x2- x1) y1 2, according to the slope of the linear positive and negative, interpolation, extrapolation of different, divided into six kinds of situations. 3. See folder "interpolation algorithm for the six species of" a map.