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。
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。
The construction, before all else, is a projective intellectual undertaking: the drawing organizes the production and elucidates the creation.
项目建设之前，一切，是投射智力承接：图纸组织生产，并阐发了创作。
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