本库用于定位
oriloc主要包括四个函数：
1、distance 用于求两点距离；
2、tria 用于三角定位；
3、cir 用于求两个圆交点；
4、angle 用于两点角度定位；
This package is used for location
oriloc includes four functions:
- "distance" is used to get the distance between two points;
- "tria" is used for triangulation;
- "cir" is used to get the intersection of two circles;
- "angle" is used for two-point angle positioning.