The problem is that the real line that shows on the computer monitor is not accurate.So we research the algorithms in which drawing a straight line with the Dx split method.In this paper,it is proved that the lines of display pixel lines are not smooth,and they are composed of many splicings of short straight lines.It plays an important scientific role to elucidate the homogenization mechanism of controlling and regulation that insert point back to a straight line.It lays a foundation of showing a straight line accurately and has a high using value of generating a line.
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