IDP.Math.KPtInLoopType 枚举
export enum KPtInLoopType 
点与环的位置关系类型。
Point and loop position relation type.
枚举成员
Inside
Inside = 1
点在环中。
The point is inside the loop.
OnEdge
OnEdge = -1
点在环的边上。
The point is on the edge of loop
OnVertex
OnVertex = -2
点在环的端点上。
The point is on the vertex of loop
Outside
Outside = 0
点在环外。
The point is outside the loop.