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In this paper, a straight line generated by three kinds of algorithms: point by point comparison method, numerical differential method (DDA Act), Bresenham algorithm research. In this paper, point by point comparison method, numerical differential method (DDA Act), Bresenham algorithm is derived to study the by-point comparison method, numerical differential method (DDA Act), Bresenham algorithm in the first quadrant of the implementation and improved point by point comparison method , numerical differential method (DDA Act), Bresenham algorithm for the realization in all quadrants. By programming practice, you can master the VC and opengl is used.