This paper think the Chinese ancient astronomer did not use the western projective in the course of drawing star map, on the contrany, they have their own personality methods.

通过对中国古代平面星图画法的研究，认为中国古代的天文学家在绘制星图时并未采用西方投影几何方法。

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The paper deals with the generation conditions, variable ranges and the drawing of the projective view of the elongate involute helical surface.

本文主要讨论延长渐开线螺旋面的形成条件、变化范围以及它的投影图绘制方法。

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According to the nature of projective scale, it has solved the problem of drawing a cars perspective when perspective vanishing point is out of the drafting board.

文中利用射影几何中射线比的特殊性质，解决了透视灭点在图板外的透视图画法。

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