B样条曲线的生成，计算机图形学重要应用之一。

用鼠标拖动输入的点做为控制顶点，生成一条B-样条曲线，显示控制顶点和多边形。用鼠标Pick曲线上任意一点，移动鼠标到新位置改变曲线形状。-Use the mouse to drag the input points as control points to generate a B-spline curve, display control vertex and polygon. Pick curve with the mouse on any point, move the mouse to

实现双线程高效下载 线程A从网络中读取一个数据块，存储到内存的缓存中。 线程B从缓存中读取内容，存储到文件中。-mutilineload Aline read datablockfrominternet ,save to the buffer in RAM. Bline read context from buffer,then save to file.

过控制顶点的BSpline曲线，能实现节点的插入、移动-Through control points BSpline curve, to achieve the node insert, move