一个opengl下的图形学实验，展示了DDA算法画直线、中点Bresenham算法画直线、改进Bresenham算法画直线、八分法绘制圆等算法的c语言实现，结果采用每秒逐点画出，清晰明了-Opengl graphics under an experiment to demonstrate the DDA algorithm for drawing a straight line, the mid-point Bresenham algorithm for drawing a straight l