在图形的绘制模块中又可以分成七个小的模块：直线、虚线、圆和圆弧、椭圆及椭圆弧、样条曲线。

Drawing module is divided into seven small modules: dash, line, rectangle, circle, arc, ellipse and bezier.

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汽蚀曲线绘制方法有传统的有手工绘法、多项式拟合法、非线性拟合法、三次样条插值法等。

Cavitation curve drawing method of the traditional hand-drawn method, polynomial fitting, non-linear fitting, cubic spline interpolation method.

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然后，设计者就可以用钢笔沿样条绘制出一条曲线。

The designer could then create a curve by drawing along the spline with a pen or pencil.

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