对象有绘制点、字符串、直线、圆弧、椭圆和许多其他形状的方法。
Object has methods to draw points, strings, lines, arcs, ellipses, and many other shapes.
对两圆弧法绘制叶片平面投影图中相对液流角的计算误差会造成叶片不连续问题提出修正；
The problem that can be likely the lamina incontinuity is resolved, which is induced by calculating error of relatively liquid angle in the drawing lamina plane by two arc.
本文还给出了圆弧的投影方程，为计算机绘制极赤图提供了计算方法。
Besides, the projecting formula of the circular arc is also listed in the paper, which can offer the computer a calculating method to draw stereoscopic projection.
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