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。
2
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。
3
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.