clipper algo..sutherland hodgeman and new techniques in graphic library

　　实现二维扫描转换多边形的扫描线算法 　　实现二维连通区域填充的种子填充算法（四连通或八连通） 　　实现二维直线段裁剪的Cohen-Sutherland裁剪算法和中点分割裁剪算法 -Realization of two-dimensional polygon scan conversion algorithm dimensional scan line connected region filled seed filling algorithm (four or eight con

Scrum is a framework for developing and sustaining complex products. This Guide contains the definition of Scrum. This definition consists of Scrum’s roles, events, artifacts, and the rules that bind them together. Ken Schwaber and Jeff Sutherl