简单的绘图程序，包含图形学直线扫描算法：DDA，中点扫描线算法，Bresenham扫描线算法，画圆扫描算法：中点画圆算法和Bresenham扫描算法，几何图形的填充算法：种子填充和扫描线填充算法等-Simple drawing program, contains a the graphics straight line scan algorithm: DDA, the midpoint of the scan line algorithm, Bresenham scan-line algorit