本文对直线的生成的3种算法：逐点比较法、数值微分法（DDA法）、Bresenham算法进行研究。本文对逐点比较法、数值微分法（DDA法）、Bresenham算法进行推导，研究了逐点比较法、数值微分法（DDA法）、Bresenham算法在第一象限的实现和改进后逐点比较法、数值微分法（DDA法）、Bresenham算法在所有象限的实现。通过编程实践，可以掌握VC和opengl的使用方法。-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.