/// <summary>
/// 如果外环是个圆,获取和外环同圆心的内环圆
/// </summary>
/// <param name="face"></param>
/// <returns></returns>
public static bool TryGetInnerLoop(this IFace2 face, out ILoop2 innerLoop)
{
var outloop = face.GetOuterLoop();
innerLoop = outloop;
if (outloop.TryGetOneCircleEdge(out IEdge edge))
{
var circlePoint = edge.GetCirlceParams().Item1;
innerLoop = face.GetLoopsWithoutOuterLoop().Where(l =>
l.TryGetOneCircleEdge(out IEdge Inneredge) ? (IsSameVector3(Inneredge.GetCirlceParams().Item1, circlePoint) ? true : false): false
).FirstOrDefault();
return(innerLoop != null ? true : false);
}
return(false);
}
/// <summary>
/// 如果此环只包含一个Edge，并且这个Edge是个圆弧，返回True，负责返回false
/// </summary>
/// <param name="loop">ILoop2 Interface</param>
/// <param name="edge"></param>
/// <returns></returns>
public static bool TryGetOneCircleEdge(this ILoop2 loop, out IEdge edge)
{
var edges = loop.GetEdgesEx();
edge = edges.FirstOrDefault();
if (edges.Count() == 1 && edges.First().IsCirlce())
{
return(true);
}
else
{
return(false);
}
}
public ILoop2Object(ILoop2 ILoop2instance)
{
ILoop2Instance = ILoop2instance;
}
/// <summary>
/// 获取环中所有的直线边
/// </summary>
/// <param name="loop"></param>
/// <returns></returns>
public static IEnumerable <IEdge> GetLineEdge(this ILoop2 loop)
{
return(loop.GetEdgesEx().Where(edge => edge.IsLine()));
}
/// <summary>
/// 获取所有的边
/// </summary>
/// <param name="loop">ILoop2 Interface</param>
/// <returns></returns>
public static IEnumerable <IEdge> GetEdgesEx(this ILoop2 loop)
{
return((loop.GetEdges() as object[]).Cast <IEdge>());
}