重点研究了构成图元的线元间几何关系特征的判定方法与判定条件。
The main research about its is geometrical relation's deducible method and condition between line units of which graphics unit consists.
导出了自行查找关联线元的方法，并侧重研究了点对缓和曲线反算问题的算法。
The process of finding the relative point is studied, with an emphasis on the algorithm of inverse point to transition curve .
导出了线元切向量的变形方程以及拉伸轴在极射赤面投影图上位置变化计算公式。
The purely kinematical equation for the tangent vector of a line element is derived.
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