用VC编写的圆弧样条，B样条曲线的绘制程序，在单文档中输入任意点，绘制出点间的圆弧样条曲线与B样条曲线-VC prepared by the arc-like, B-spline curve mapping procedures in a single document input arbitrary point and draw points of the circular spline curves and B-spline cur