The philosophic thinking of "Four directions" and "Eightdirections" of primitive human was a very important milestone from primal chaos thought transited to abstract thought.
四方和八方的哲学观更是原始人类，由混沌思维过渡至抽象思维的重要里程碑。
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This paper gives an algorithm of the acquisition of boundary vector of regions through a way of bi value processing and the directory judgement of the neighbouring domains in eightdirections.