计算机辅助几何设计大作业。包含两个部分——贝赛尔曲线绘制以及B样条曲线绘制，分别使用deCastljau和deBoor算法实现，鼠标点击输入控制顶点（不限数量），回车后绘制图形。两个程序控制顶点均可用鼠标拖动。贝赛尔曲线绘制功能比较完善，包含贝赛尔曲线及其升阶、延拓、求导等功能。-Computer aided geometric design work. Consists of two parts- beisaier curve drawing and b-spline curve drawing, use deCastljau and deBoor algorithm respectively, the mouse to click the input control vertices (population), enter after painting. Both program control vertex can use the mouse to drag. Beisaier curve to draw relatively perfect in functions, contains beisaier curve and its order, continuation, derivation, and other functions.