基础算法库：包括常用坐标系定义、欧拉角的定义、仿真算法库的建立等。
The mathematical model is composed of the following parts:1) Basic algorithm library: it covers the definition of coordinate system and Euler angles, as well as simulation algorithm library, etc.
度量为坐标系定义的几何函数，有了它，坐标系上任意两点间的距离可以通过点的坐标来计算。
A geometric function defined for a coordinate system such that the distance between any two points in that system may be determined from their coordinates.
WKT和SVG在坐标系中定义不同的原点。
WKT and SVG define different origins for the coordinate systems.
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